Astro 10: Exam 2
What holds it together? A)...Magnetic forces B)...Electric forces C)...Gravity
C)...Gravity
What created the white streaks that you can see radiating from the point C? A)... A volcanic eruption. B)... Wind blowing dust in the lunar atmosphere. C)...Material "splashed" out by the impact of a large object. D)... A very intense local magnetic field that aligned the lunar surface dust. E)... Water flowing out of a pit as the Sun warms and melts sub-surface ice.
C)...Material "splashed" out by the impact of a large object.
What is the largest object in the Solar System? A)... The Sun. B)...Jupiter. C)... The Earth. D)...Saturn. E)...Pluto.
A)... The Sun.
A planet can never be seen at opposition whose orbit relative to the Earth's has a a) smaller radius. b) larger radius. c) longer year. d) greater ellipticity.
a) smaller radius.
Jupiter's chemical composition is closest to that of a) the Sun. b) Earth. c) Mars. d) the Moon. e) Venus.
a) the Sun.
If you observe the Moon rising in the east as the Sun is setting in the west, then you know that the phase of the Moon must be a) new. b) first quarter. c) full. d) third (or last) quarter. e) Any of the above, depending on other factors
c) full.
The lunar mare were formed primarily by a) melting and solidification followed by impacts. b) volcanism. c) impact with later volcanism. d) volcanism with later impact.
c) impact with later volcanism.
Satellites of Mars probably formed a) out of a merger of telecommunications giants. b) out of the same material from which Mars formed. c) in the asteroid belt, and were later captured. d) in the Oort Cloud. e) as a result of cometary bombardment.
c) in the asteroid belt, and were later captured.
As seen from Earth, a superior planet can never be observed at a) superior conjunction. b) quadrature. c) inferior conjunction. d) opposition. e) none of these.
c) inferior conjunction.
The fact that there are fewer craters on the lunar maria than on the lunar highlands indicates that the a) highlands are younger than the maria. b) craters formed as a result of volcanic eruptions. c) maria formed more recently. d) maria are of volcanic origin.
c) maria formed more recently.
What is responsible for heating the terrestrial planets from inside? a) temperature b) solar radiation c) radioactivity d) fusion
c) radioactivity
What causes tides? A)... The Moon's gravity. B)... The Moon's magnetic field. C)... The Moon's magnetic field. D)... The elliptical shape of the Moon's orbit. E)... The elliptical shape of the Earth's orbit.
A)... The Moon's gravity.
The tail of a comet is generally directed a) away from the Sun because of the solar wind and radiation pressure. b) opposite the direction of motion as the comet passes through interplanetary matter. c) toward the Sun because of the Sun's gravitational force. d) along the comet's magnetic field lines.
a) away from the Sun because of the solar wind and radiation pressure.
Synchrotron radiation is produced a) by electrons moving rapidly in a magnetic field. b) by electrons traveling with a velocity determined by the temperature of the gas in which they are found. c) by a "blackbody". d) by microwave ovens.
a) by electrons moving rapidly in a magnetic field.
If Venus is observed to have a crescent phase while its elongation angle (away from the Sun) is 20 degrees, it must be ________ to/from the Earth than the Sun is. a) closer b) farther c) equally distant d) Can't tell from the information given.
a) closer
The synodic period of a planet is the time during which a body in the Solar System makes one orbit of the Sun relative to the Earth, i.e., returns to the same elongation. For a superior planet to the Earth, as the synodic period increases, its sidereal period must a) decrease. b) increase. c) stay the same.
a) decrease.
When two continental plates collide, the likely result is that a) folded mountains are created. b) a hot spot is produced. c) very young rocks emerge from below the crust. d) a crater is formed.
a) folded mountains are created.
Consider the planets closer to the Sun than Jupiter. Of these planets, the two with the largest elongations have the ______ distances from the Sun. a) largest b) smallest c) the same d) not enough information
a) largest
It is full moon and it is the night of winter solstice. The Moon must be a) north of the celestial equator. b) on the celestial equator. c) south of the celestial equator. d) Not enough information is given to answer this question.
a) north of the celestial equator.
For an inferior planet in our Solar System, the correct sequence of events as seen from Earth is a) superior conjunction, greatest eastern elongation, inferior conjunction, greatest western elongation. b) inferior conjunction, greatest eastern elongation, inferior conjunction, greatest western elongation. c) superior conjunction, greatest western elongation, inferior conjunction, greatest eastern elongation. d) inferior conjunction, greatest eastern elongation, opposition, greatest western elongation.
a) superior conjunction, greatest eastern elongation, inferior conjunction, greatest western elongation.
Asteroids are unlikely to be fragmented planets because a) the total mass of asteroids is small. b) no known mechanism exists to disrupt a planet. c) asteroid orbits are in the ecliptic. d) asteroids are typically only a few kilometers across. e) asteroids can have different colors. Note: You may choose more than one answer.
a) the total mass of asteroids is small. b) no known mechanism exists to disrupt a planet.
When at greatest western elongation, Venus may be observed a) west of the Sun in the morning sky. b) west of the Sun in the evening sky. c) east of the Sun in the morning sky. d) east of the Sun in the evening sky.
a) west of the Sun in the morning sky.
You visit a planet that rotates on its axis in 2 hours, while it revolves closely around its sun every 25 hours. You construct for the inhabitants an excellent calendar with a leap year that occurs once every a) year. b) 2 years. c) 12 years. d) 25 years.
b) 2 years.
When Jupiter is at quadrature, the angle between Jupiter and the Sun as seen from Earth is a) 0 degrees. b) 90 degrees. c) 180 degrees. d) 45 degrees.
b) 90 degrees.
When Mercury is at greatest elongation, the angle between Earth and the Sun as seen from Mercury is a) 0 degrees. b) 90 degrees. c) 180 degrees. d) 45 degrees.
b) 90 degrees.
Which of the following could cause a meteor shower? a) A meteoroid hits a cloud in the atmosphere, and creates a thunderstorm. b) Earth crosses the debris-filled orbit of a comet. c) Asteroids in the same orbit as the Earth. d) A small constellation of dying stars disintegrates.
b) Earth crosses the debris-filled orbit of a comet.
Holga and Hilda are 2 asteroids. They have the same size and shape and are at the same distance from Sun. Holga is icy with an albedo of 0.9. Hilda is rocky with and albedo of 0.1. Which is brighter in infrared light? a) Holga b) Hilda c) They are equally bright.
b) Hilda
Which of the following is correct? a) The rotation axes of planets are perpendicular to their orbital plane (the ecliptic). b) No planet's orbital inclination is more than 20 degrees from the ecliptic. c) Planets orbits are circular. d) Planets always rotate and revolve in the same direction.
b) No planet's orbital inclination is more than 20 degrees from the ecliptic.
The retrograde loops of Saturn are smaller than those of Jupiter because a) Saturn moves more slowly in its orbit. b) Saturn is farther away, and loop size is largely determined by the planet's parallax. c) the motions of Saturn are more gradual since it has a lower temperature. d) the older parts of the Solar System move in smaller circular motions.
b) Saturn is farther away, and loop size is largely determined by the planet's parallax.
Why are some large crater walls sharp and steep, while others are more rounded? a) Different volcanoes make different craters. b) age differences c) size differences among the impact bodies d) composition differences among the impact bodies e) seismic activity on the Moon
b) age differences
Why can we never see an absolutely new moon? It is a) always on the other side of the Earth. b) always too close to the Sun. c) never up during the day. d) always on the horizon. e) always covered up by the Sun.
b) always too close to the Sun.
The sizes of particles comprising Saturn's rings are studied by analyzing a) shadows cast by the rings. b) how light is scattered by the ring particles. c) excess radiation emitted by the rings. d) excess radiation emitted by the planet that is blocked by the rings.
b) how light is scattered by the ring particles.
Uranus is surrounded by a cloud of a) asteroids. b) hydrogen. c) helium. d) water molecules.
b) hydrogen.
During a single night, the Moon a) moves from west to east across the sky. b) moves from east to west across the sky. c) appears fixed in the sky above a given location on Earth. d) appears fixed in the sky relative to the constellations.
b) moves from east to west across the sky.
Io's volcanic activity is driven mostly by heat from a) radioactivity. b) the Jupiter-Io tidal force. c) Jupiter's magnetic fields. d) the solar wind.
b) the Jupiter-Io tidal force.
Which theory of lunar origin lost support when the Apollo landing results showed similar abundances of isotopes of oxygen on both the Earth and Moon? a) the fission theory b) the capture theory c) formation together from the same gas cloud d) the dairy theory
b) the capture theory
The Moon at night appears brighter in the winter because a) the nights are longer. b) the declination of the full moon is higher in winter. c) the cold air makes the Moon appear stronger. d) the interaction between the tides and the cold air intensifies moonlight.
b) the declination of the full moon is higher in winter.
When Saturn is at conjunction, the angle between Saturn and the Earth as seen from the Sun is a) 0 degrees. b) 90 degrees. c) 180 degrees. d) 45 degrees.
c) 180 degrees.
The greatest elongation of Mercury is about a) 45 degrees. b) 90 degrees. c) 28 degrees. d) 23.5 degrees.
c) 28 degrees.
An experiment is done in the Earth's upper atmosphere in which two kinds of micrometeorites are collected: cometary and asteroidal particles. Which of the following statements is true about these particles? a) All particles have about the same velocity. b) Asteroidal particles typically move faster. c) Cometary particles typically move faster. d) These particles are all moving slower than Earth's escape velocity. e) Two of the above.
c) Cometary particles typically move faster.
Order the following by increasing radius. I. Sun II. Jupiter's orbit around Sun III. Earth's orbit around Sun IV. Sun's orbit around the Galaxy a) III, II, I, IV b) I, II, III, IV c) I, III, II, IV d) I, II, IV, III
c) I, III, II, IV
Synchrotron radiation from Saturn implies that the planet has a) powerful electrical storms. b) an unseen companion. c) a magnetic field. d) excess thermal radiation.
c) a magnetic field.
The location of the Oort cloud of comets is a) near Pluto's orbit. b) between the orbits of Mars and Jupiter. c) between 1/6 to 1/2 the distance to the nearest star. d) close to the nearest star. e) we have no idea since it has never been detected.
c) between 1/6 to 1/2 the distance to the nearest star.
The surface of Venus is mostly low density rock, while the average density of Venus is similar to that of Earth. The interior of Venus is therefore a) rapidly rotating. b) composed of low density material. c) denser than the average density of Earth. d) homogeneous.
c) denser than the average density of Earth.
There is very little atmosphere on the Moon because a) dry rocks on the Moon absorbed its own atmosphere. b) it was blown away by meteor bombardment. c) its low mass and high temperature allowed most gases to escape. d) the gravitational tidal forces from the Earth stripped it away.
c) its low mass and high temperature allowed most gases to escape.
Mars is a) observed at opposition every year. b) observed at opposition twice a year. c) observed at opposition every two years. d) never observed at opposition.
c) observed at opposition every two years.
For a superior planet in our Solar System, the correct sequence of events as seen from Earth is a) opposition, eastern quadrature, western quadrature, conjunction. b) opposition, western quadrature, conjunction, eastern quadrature. c) opposition, eastern quadrature, conjunction, western quadrature. d) conjunction, eastern quadrature, western quadrature, opposition.
c) opposition, eastern quadrature, conjunction, western quadrature.
The shape of Jupiter's magnetic field is flattened because of the solar wind and the a) low temperatures in the outer Solar System. a) planet's strong gravity. c) planet's rotation. d) many moons.
c) planet's rotation.
Volcanoes on Mars have become much larger than on Earth mostly because Mars lacks a) a thick atmosphere. b) flowing water. c) plate tectonics. d) a large moon.
c) plate tectonics.
Venus is unusual because of its retrograde rotation. This means that Venus a) rotates much more slowly than the other planets. b) does not always rotate with its axis at the same angle to the plane of the ecliptic. c) rotates in an opposite direction compared to most other planets in the Solar System. d) changes its direction of rotation.
c) rotates in an opposite direction compared to most other planets in the Solar System.
Your latest discovery, Planet Eris, never had volcanoes. The processes of erosion on Eris have unequal but constant rates in different surface regions. A reasonable way to estimate which region has the least erosion is simply by choosing the region with a) the fewest craters. b) the largest craters. c) the most craters. d) maria.
c) the most craters.
The Jovian planets have retained most of their atmospheres because a) they are further from the Sun's gravitational pull than the terrestrial planets. b) they are very warm and massive. c) they are very cold and massive. d) the planet's rings "fence in" the planetary atmosphere.
c) they are very cold and massive.
Which of the following planets are primarily rocky with iron cores? A).. Venus, Jupiter, and Neptune. B)..Mercury, Venus, and Pluto. C).. Mercury, Venus, and Earth. D)..Jupiter, Uranus, and Neptune. E)..Mercury, Saturn, and Pluto.
C).. Mercury, Venus, and Earth.
What do we mean by the Solar System? A)..The planets and their moons. B)..The Sun, the planets, and their moons. C).. The Sun, the planets, their moons, and the minor objects like comets and asteroids.
C).. The Sun, the planets, their moons, and the minor objects like comets and asteroids.
Why doesn't the Moon have an atmosphere? A)... It is so cold that all the gases have frozen out and are buried below the surface. B)... It spins so fast that all the gases have been flung off into space long ago. C)... It is not massive enough to have a strong enough gravitational pull to hold onto gases. D)... The question is a trick. The Moon has a dense atmosphere. E)... The Moon's atmosphere is all on the dark side that we can't see from Earth.
C)... It is not massive enough to have a strong enough gravitational pull to hold onto gases.
We don't get eclipses every month. This is because A)... the Moon has phases. B)... the Earth's rotation axis is tilted with respect to its orbit. C)... the Moon's orbit is tilted with respect to the Earth's orbit. D)... the Earth's orbit is elliptical. E)... the Moon's orbit is elliptical.
C)... the Moon's orbit is tilted with respect to the Earth's orbit.
About how old is the Solar System? A)... 10 million years B)... 10 thousand years C)...5 billion years D)...5 trillion years E)...50 million years
C)...5 billion years
From what did the Solar System form? A)... A comet captured by the Sun. B)...The debris from two colliding stars. C)...An interstellar cloud. D)... Debris from two colliding galaxies. E)...Material that fell into a black hole and which was then ejected in a narrow beam.
C)...An interstellar cloud.
What component of the clouds became the inner planets? A)...The gaseous hydrogen. B)... The ice. C)...The dust grains. D)... The uranium atoms. E)...The gravitons.
C)...The dust grains.
What are the smaller round pits with raised rims called? A)... Craters. B)... Rilles. C)... Rays. D)... Roche rings. E)... Millipores.
A)... Craters.
Why is Pluto not considered a Jovian planet? A)... Its mass and radius are so small, and it lacks the thick atmosphere of hydrogen seen on the other Jovian planets. B)... It is so far out in the Solar System. C)... Its interior is mostly rock and iron. D)... Its atmosphere is rich in oxygen, making it more like the Earth. E)...It is not really orbiting the Sun but is simply drifting through the outer edge of the Solar System.
A)... Its mass and radius are so small, and it lacks the thick atmosphere of hydrogen seen on the other Jovian planets.
About how big is the Moon's radius compared to the Earth's? A) one half. B) one quarter. C) one tenth. D) one one hundreth. E) one sixteenth.
B) one quarter.
What is the Moon's phase at a lunar eclipse? A)... New. B)... Full. C)... First Quarter. D)...Third quarter. E)... It can be any phase; it depends.
B)... Full.
How do we know how old the Solar System is? A)... Astronomers exploring the Moon have found tablets left by aliens that tell us. B)... Products of radioactive decay in old rocks. C)... The amount of water in old rocks. D)...The size of a planet. E)... Both C and D.
B)... Products of radioactive decay in old rocks.
Why don't you see any signs of clouds or haze above the Moon's surface? A)... The molecules are are too small. B)... The Moon has no atmosphere. C)... The Sun shines directly down so it does not reflect strongly. D)...The Moon is so hot that clouds and haze can't condense. E)... Microbes in the Moon's atmosphere "eat" all the particles that condense there.
B)... The Moon has no atmosphere.
What do we call the large objects that move in orbit around the Sun? A)...moons. B)... planets. C)... planetesimals. D)... microtesimals. E)...Macrotesimals.
B)... planets.
How do the planets near the Sun differ from those farther out? A)... The ones nearest the Sun are generally biggest. B)...The ones nearest the Sun are generally smallest. C)... The ones nearest the Sun spin fastest. D)... The ones nearest the Sun contain more hydrogen. E)... The ones farthest from the Sun contain a higher proportion of iron.
B)...The ones nearest the Sun are generally smallest.
What are the large smooth dark areas called? A) Highlands. B) Rilles. C) Rays. D) Maria. E) Strato-vents.
D) Maria.
Given that the Moon's diameter is about 3500 km ( roughly 2000 miles), about how big across is the dark area marked B? A) 180 km. B) 38 km. C) 580 km. D) 58 km. E) 1380 km.
C) 580 km.
Why does the Moon shine in the sky? A) It's surface is so hot. B) It reflects light from the Earth. C) It reflects light from the Sun. D) It reflects light from the stars. E) Light from its core leaks out through the craters.
C) It reflects light from the Sun.
What causes the phases of the Moon? A) The shadow of the Earth on the Moon B) The shadow of the Sun on the Moon C) The Moon's motion around the Earth causing us to see different amounts of it lit D) A dark cloud in orbit between us and the Moon E) Peculiar absorption of light by the Moon's surface.
C) The Moon's motion around the Earth causing us to see different amounts of it lit
Which of the following two astronomical effects that we see on Earth are caused by the Moon? A) Day and night. B) Summer and Winter. C) Tides and Eclipses. D) Spring and Fall. E) Ice ages and El Nino.
C) Tides and Eclipses.
One explanation of why the planets near the Sun are composed mainly of rock and iron is that A)...the Sun's magnetic field attracted all the iron in the young Solar System into the region around the Sun. B)...the Sun is made mostly of iron. The gas ejected from its surface is therefore iron so that when it cooled and condensed it formed iron-rich planets near the Sun. C)...the Sun's heat made it difficult for other substances such as ices and gases to condense near it. D)...the statement is false. The planets nearest the Sun contain large amounts of hydrogen gas and subsurface water. E)...the Sun's gravitational attraction pulled iron and other heavy material inward and allowed the lighter material to float outward.
C)...the Sun's heat made it difficult for other substances such as ices and gases to condense near it.
How are the Moon and eclipses related? A)... The Moon's shadow falls on the Earth at a solar eclipse. B)... Earth blocks sunlight from reaching the Moon at a lunar eclipse. C)... The Moon's gravity bends light away from the Earth at a solar eclipse. D)... Both A and B. E)... None of the above.
D)... Both A and B.
The numerous craters we see on the solid surfaces of so many Solar System bodies are evidence that A)... they were so hot in their youth that volcanoes were widespread. B)... the Sun was so hot that it melted all these bodies and made them boil. C)... these bodies were originally a mix of water and rock. As the young Sun heated up, the water boiled, creating hollow pockets in the rock. D)... they were bombarded in their youth by many solid objects. E)... all the planets were once part of a single, very large and volcanically active mass that subsequently broke into many smaller pieces.
D)... they were bombarded in their youth by many solid objects.
What are interstellar clouds made of? A)...Sugar and spice and everything nice. B)...Swarms of uranium atoms that gradually decay into water. C)...Iron and carbon atoms, mostly. D)...Mostly hydrogen and a small amount of dust grains. E)...Mostly helium and mercury droplets.
D)...Mostly hydrogen and a small amount of dust grains.
Which of the following features of the Solar System does the solar nebula hypothesis explain? A)... All the planets orbit the Sun in the same direction B)... All the planets move in orbits that lie in nearly the same plane. C)...The planets nearest the Sun contain only small amounts of substances that condense at low temperatures. D)... All the planets and the Sun, to the extent that we know, are the same age. E)... All of the above.
E)... All of the above.
Holga and Hilda are 2 asteroids. They have the same size and shape and are at the same distance from Sun. Holga is icy with an albedo of 0.9. Hilda is rocky with an albedo of 0.1. Which is brighter in visible light? a) Holga b) Hilda c) They are equally bright.
a) Holga
Place the statements concerning lunar formation below in chronological order from the time of formation: I. coalesced from orbiting debris II. cooling of interior III. mare formed IV. surface melting by heavy bombardment a) I, IV, III, II b) III, II, IV, I c) I, II, III, IV d) IV, III, II, I e) II, III, IV, I
a) I, IV, III, II
Which of Jupiter's major satellites probably suffers from the highest velocity impacts? a) Io. (Mass kg, Distance 421,600 km) b) Europa. (Mass kg, Distance 670,900 km) c) Ganymede. (Mass kg, Distance 1,070,000 km) d) Callisto. (Mass kg, Distance 1,883,000 km) e) All suffer the same impact velocities.
a) Io. (Mass kg, Distance 421,600 km)
Mnemonic: My Very Educated Mother Just Showed Us Nine Planets. Which planet(s) can never be seen on the meridian at midnight? a) Mercury b) Venus c) Mars d) Jupiter e) Saturn (Note: Mark all possible correct answers).
a) Mercury b) Venus
Which of the following are correct? a) The Earth is closest to the Sun in January. b) The Earth is farthest from the Sun in January. c) The Earth is always at the same distance from the Sun. d) It's cold in winter because the Earth is farther from the Sun.
a) The Earth is closest to the Sun in January.
Why do Mercury and the Moon have almost no atmosphere? a) The gravity at their surfaces is low, so most gas molecules travel fast enough to escape the planet. b) The temperature at their surfaces is high, so most gas molecules travel fast enough to escape the planet. c) The only gas molecules that they had originally were low in mass, so that they were immediately able to escape. d) They are both highly reflective.
a) The gravity at their surfaces is low, so most gas molecules travel fast enough to escape the planet.
On a given day, one is likely to see the most meteors ("shooting stars") a) after midnight. b) before midnight. c) during the afternoon. d) it doesn't depend on the time of day.
a) after midnight.
How much more solar energy does Venus receive than the Earth, due to the fact that Venus is 0.72 times as far from the Sun? a) 0.72 times as much b) 1/0.72 = 1.4 times as much c) 0.72 (squared) = 0.52 times as much d) (1/0.72) (squared) = 1.92 times as much e) 0.28 times as much.
d) (1/0.72) (squared) = 1.92 times as much
Which of the following assumptions of the original solar nebula hypothesis is probably wrong, in light of the evidence provided by extrasolar planets so far? a) Planets as massive as the Jovian planets must be composed primarily of hydrogen and helium. b) Jovian planets are likely to form relatively far from the star. c) Centrifugal forces (due to increasing orbital speeds) prevent the gas in the solar nebula from being pulled into the star. d) Planetary orbits do not shrink after the planet forms.
d) Planetary orbits do not shrink after the planet forms.
Comets could be (and were) proven to be beyond the Moon by observing a) a collision of one with the Moon. b) the relative size of the comet tail and the Moon. c) a parallax larger than the Moon's. d) a parallax smaller than the Moon's.
d) a parallax smaller than the Moon's.
From Earth, Mercury is difficult to see mostly because it a) has low albedo. b) is very dense. c) is very small. d) always appears near the Sun.
d) always appears near the Sun.
If the Moon was third quarter last Saturday, what phase will it be this Saturday? a) waning crescent b) waxing gibbous c) at or very near first quarter d) at or very near new e) Any of the above, depending upon other factors.
d) at or very near new
Uranus is peculiar because its a) radius is so large. b) orbit is highly eccentric. c) orbit is strongly inclined to the ecliptic plane. d) axis of rotation is in the ecliptic plane.
d) axis of rotation is in the ecliptic plane.
The Jovian planets are characterized by their a) high density. b) slow rotation. c) small size. d) composition - mostly hydrogen and helium. Note: More than one answer may apply
d) composition - mostly hydrogen and helium.
When at greatest eastern elongation, Venus may be observed a) west of the Sun in the morning sky. b) west of the Sun in the evening sky. c) east of the Sun in the morning sky. d) east of the Sun in the evening sky.
d) east of the Sun in the evening sky.
The atmosphere of Jupiter has few heavy elements due to a) evaporation. b) the lack of heavy elements in the outer Solar System. c) the vacuum-like power of the Great Red Spot. d) gravitational settling toward the planet's center.
d) gravitational settling toward the planet's center.
Seasons on Uranus are a) as long as Uranus' year. b) non-existent. d) one fourth of Uranus' year, or about 20 Earth years long. e) four times Uranus' year, or about 320 Earth years long
d) one fourth of Uranus' year, or about 20 Earth years long.
Long-period comets have orbits a) the same as the orbits of short-period comets. b) that are circular. c) always in the ecliptic. d) randomly oriented with respect to the ecliptic. e) of low eccentricity.
d) randomly oriented with respect to the ecliptic.
The terrestrial (inner) planets are characterized by a) low density. b) rapid rotation. c) large size. d) rocky composition. Note: More than one answer may apply
d) rocky composition.
The Moon a) always points the same face toward the Sun. b) does not rotate. c) rotates at the same rate as the Earth - once per day. d) rotates on its axis with the same period as its revolution about the Earth.
d) rotates on its axis with the same period as its revolution about the Earth.
Mercury's atmosphere is likely to be weak or non-existent because of its a) small mass. b) slow rotation. c) high surface temperature. d) high density. e) (a) and (c).
e) (a) and (c).
Which of the following are correct? a) Mars is essentially in the same orbit as the Earth. b) There are canals filled with liquid water on Mars. c) If there is water, that means there is oxygen and therefore that we can breathe on Mars. d) All of the above. e) None of the above.
e) None of the above.
If its mass were closer to those of Earth and Venus, Mars might have had a) an active interior. b) a larger atmosphere than Earth. c) abundant water, but larger ice caps. d) a magnetic field. e) all of the above.
e) all of the above.
