-4. Astronomy Final (1-126)
Why is Mars red? A. Mercuric oxide is abundant and has a red tint. B. Sulfuric acid rain etched a reddish color into iron-rich surface rocks. C. Dust storms on the planet have blasted the planet so fiercely that the rocks have reddened. D. The iron in the surface rocks have been oxidized over time. E. The ancient volcanoes poured out vast plains of molten sulfur, much as on Io, which has now solidified and preserved the reddish color.
D
Which statement about the first quarter moon is FALSE? A. It is the half moon of the evening sky. B. It rises about noon. C. It is highest in the sky at sunset. D. From the Earth, it appears 25% sunlit. E. It occurs about a week after new moon.
D
Changes in the predicted motion of Uranus led to the search for an eighth planet. A. True B. False
T
Ice has been detected near the poles of both the Moon and Mercury. A. True B. False
T
Mars has an axial tilt more like the Earth's than any other planet. A. True B. False
T
Mercury has the widest variation in surface temperatures between night and day of any planet in the solar system. A. True B. False
T
Meteor showers are the result of debris left behind by the passage of a decaying comet. A. True B. False
T
Most of the time, Venus is the third-brightest object in the sky. A. True B. False
T
Pluto's orbit takes it closer to the Sun than Neptune for part of its orbit. A. True B. False
T
Saturn is less dense than water. A. True B. False
T
Telescopically, Jupiter is the most colorful and changeable of the planets. A. True B. False
T
The Sun is a fairly normal star. A. True B. False
T
Uranus and Neptune are very similar in size and mass. A. True B. False
T
Venus can appear as a crescent through the telescope. A. True B. False
T
Venus is almost the same size, mass, and density as the Earth. A. True B. False
T
Venus' surface temperature is fairly uniform, hot on both day and night sides. A. True B. False
T
About how many stars are visible on a clear, dark night with the naked eye alone? A. a few hundred B. a few thousand C. tens of thousands D. a few dozen E. millions and millions
B
The planet whose pole was facing the Sun when Voyager 2 approached in 1986 was A. Jupiter. B. Neptune. C. Saturn. D. Mars. E. Uranus.
E
The rotation periods of Venus, Jupiter, Saturn, Uranus and Neptune are difficult to determine because A. they rotate so fast. B. they are all gas giants. C. each one has a large satellite that interferes with this measurement. D. they are so far away from the Sun. E. their surface features are obscured by their atmospheres.
E
What are Saturn's rings? A. large rocky boulders moving in orbit around Saturn B. a glowing, flat magnetospheric auroral display C. a solid thin disc of material encircling Saturn D. a great disk of liquid helium E. small icy particles moving in orbit around Saturn
E
What celestial line is a product of the Earth's orbit around the Sun? A. Equator B. Galactic Plane C. Analemma D. Prime Meridian E. Ecliptic
E
What is the name used to describe the dark bands encircling Jupiter? A. convection cells B. brown stripes C. zonal flows D. zones E. belts
E
Which of the choices below correctly lists things in order from largest to smallest? A. Local Group, Solar System, Milky Way, Universe B. Milky Way, Universe, Solar System, Local Group C. Universe, Milky Way, Local Group, Solar System D. Solar System, Local Group, Universe, Milky Way E. Universe, Local Group, Milky Way, Solar System
E
Why does Venus appear so bright to the eye? A. The planet's cloud-cover is highly reflective, reflecting 60% of the sun's light. B. It gets closer to us than any other planet does. C. As seen from Earth, the disk of Venus can appear larger than any other planet's. D. Venus is closer to the Sun, so gets more intense sunlight. E. All of the above are correct.
E
The crust of the Earth is covered by about ________ water in the hydrosphere. A. 70% B. 90% C. 80% D. 60% E. 50%
A
A year is defined as A. the time it takes for Earth to complete an orbit around the Sun. B. the time it takes for the moon to complete a phase cycle. C. the time it takes for the Sun to complete an orbit around Earth. D. the time it takes for Earth to complete a rotation on its axis. E. the time it takes for the moon to complete an orbit of Earth.
A
About what percent of the incoming energy from the Sun' reaches Earth's surface? A. 50-70% B. 80-100% C. 70-90% D. 60-80% E. 30-60%
A
Essentially, the Great Red Spot is A. a large cyclonic storm (hurricane). B. traveling north and south across Jupiter's face. C. always located within 10 degrees of Jupiter's north pole. D. composed primarily of iron oxide. E. Neptune's largest atmospheric feature.
A
From inside out, which is in the correct order for the structure of the Sun? A. radiative zone, convective zone, chromosphere B. convective zone, radiative zone, granulation C. core, convective zone, radiative zone D. photosphere, radiative zone, corona E. core, chromosphere, photosphere
A
How does the density of Jupiter compare to the terrestrial planets? A. Its density is less than any terrestrial. B. It is denser than all the terrestrial planets combined. C. It is denser than the Moon, but less dense than any of the others. D. Its density is slightly less than Mercury, but more than Mars. E. Its density is about the same as Mars.
A
How long does the sunspot cycle last, on average? A. about 11 years B. about 76 years C. about seven years D. between 25 and 35 days E. 365.25 days
A
Kepler's first law worked, where Copernicus' original heliocentric model failed, because Kepler described the orbits as A. elliptical, not circular. B. much larger than Copernicus had envisioned. C. being on equants instead of epicycles. D. complex, with epicycles to account for retrograde motions. E. around the Sun, not the earth.
A
Kepler's second law implies what about planetary motion? A. A planet moves faster when it is closer to the Sun. B. A planet moves faster when it is farther from the Sun. C. A planet moves at a constant speed during its orbit of the Sun. D. This law implies nothing about a planet's motion. E. A planet moves slower when it is closer to the Sun.
A
Most asteroids are found: A. between the orbits of Mars and Jupiter. B. in the orbit of Jupiter, but 60 degrees ahead or behind it. C. orbiting the jovian planets in captured, retrograde orbits. D. beyond the orbit of Neptune. E. between the Earth and Sun.
A
The critical part of the atmosphere for protecting life on the ground from excessive ultraviolet radiation is the: A. ozone layer. B. troposphere. C.hydrosphere. D. ionosphere. E. stratosphere.
A
The largest asteroid, and probably the only one to be a spherical "world" is A. Ceres. B. Ida. C. Vesta. D. Eros. E. Gaspra.
A
The most famous prehistoric astronomical observatory is: A. Stonehenge. B. Mount Rushmore. C. Carcacol. D. Big Horn stone circle. E. the Sphinx.
A
The place in a planet's orbit that is closest to the Sun is called A. perihelion B. vernal equinox C. crossing the ecliptic. D. aphelion E. None of these; a planet's distance from the Sun never changes.
A
The primary purpose of a telescope is to A. collect a large amount of light and bring it into focus. B. make distant objects appear nearby. C.measure the brightness of stars very accurately. D. separate light into its component wavelengths. E. magnify distant objects.
A
The process occurring when photons bounce off a polished surface is called: A. refraction. B. dispersion. C. diffraction. D. reflection. E. interference.
A
The smallest sort of interplanetary matter is called A. interplanetary dust. B. an asteroid. C. a meteoroid. D. a Kuiper Belt Object. E. a comet.
A
The tail of a comet always points A. away from the Sun and becomes longest and brightest at perihelion. B. away from the Sun and disappears at perihelion. C. toward Earth and never varies. D. toward the Sun and disappears at perihelion. E. in the direction of the comet's motion.
A
Tycho Brahe's contribution to Kepler's Laws of Planetary Motion were A. his detailed and accurate observations of the planet's position. B. a mathematical explanation of epicycles. C. a precise lunar calendar. D. the correct explanation of lunar phases. E. his observations of Jupiter's moons.
A
What is true about solar system densities? A. The denser planets lie closer to the Sun. B. The asteroids all have about the same density. C. Planetary density increases with increasing distance from the Sun. D. Saturn has the same density as water. E. In differentiated bodies, the denser materials lie near their surfaces.
A
When water vapor condenses out at the cool tops of convection cells, what happens? A. clouds form B. it rains C. it snows D. a hurricane forms E. a tropical depression forms.
A
Which of these was NOT a telescopic discovery of Galileo? A. the moons of Saturn B. the craters and mare of the Moon C. sunspots and the rotation of the Sun D. the four largest moons of Jupiter E. the phases of Venus
A
Why are most large telescopes reflectors, not refractors? A. All of the above are correct. B. Large, very clear lenses are harder to cast than more tolerant mirror blanks. C. Large mirrors need only one optical surface, achromats four surfaces to grind. D. Reflectors do not suffer from chromatic aberration like refractors do. E. Large lenses deform under their own weight, but mirrors can be supported.
A
Why is the sky blue? A. the atmosphere scatters the light from the Sun B. the atmosphere reflects the light from the Sun C. the oceans refract the light from the Sun into the atmosphere D. the oceans reflect the light from the Sun into the atmosphere E. the atmosphere reflects the color of the oceans
A
In order to determine the mass of a planet by applying Newton's laws of motion and gravity, the planet must have A. rings. B. moons. C. a known size and distance from Earth. D. a solid surface. E. planets further from the Sun than itself.
A ??
One advantage of the Hubble Space telescope over ground based ones is that A. in orbit, it can operate close to its diffraction limit at visible wavelengths. B. its adaptive optics controls atmospheric blurring better. C. it can better focus X-ray images. D. it can make better observations of the ozone layer. E. it is larger than any Earth-based scopes.
A ??
Planetary orbits A. are almost circular, with low eccentricities. B. are spaced more closely together as they get further from the Sun. C. are evenly spaced throughout the solar system. D. are highly inclined to the ecliptic. E. have the Sun at their exact center.
A ??
Diffraction is the tendency of light to: A. separate into its component colors. B. spread around corners. C. reflect off a mirror. D. bend through a lens. E. disperse within a prism.
B
From the center outward, the correct order is: A. solid metal core, molten metal hydrosphere, rocky lithosphere, gases in atmosphere. B. solid metallic inner core, molten metal outer core, silicate mantle and crust. C. liquid iron inner core, solid nickel outer core, rocky mantle, silicate crust. D. molten metal hydrosphere, molten rock lithosphere, solid silicate crust. E. solid rock core, liquid metal mantle, solid rock crust.
B
How many moons does Mars have? A. three B. two C. one D. four E. none
B
If the Moon rose tonight at 6 PM, then tomorrow it will rise about: A. dawn. B. 7 PM. C. 5 PM. D. midnight. E. the same time.
B
Pluto is most similar to A. Europa. B. Triton. C. Miranda. D. our Moon. E. Mercury.
B
The density of the Sun is most similar to which object? A. Halley's Comet's nucleus B. Jupiter C. Mercury D. the Earth E. the Moon
B
The orbits of most asteroids A. cross the orbit of Mars. B. lie entirely beyond the orbit of Mars. C. cross the orbits of all four terrestrial planets. D. cross the orbit of Earth. E. lie beyond Neptune.
B
The plane in which almost all planets orbit the sun is called the: A. galactic plane. B. ecliptic. C. equator of the solar system. D. equant. E. node.
B
Which of the Galilean moons is the densest and most geologically active? A. Titan B. Io C. Europa D. Callisto E. Ganymede
B
Which of the following are the Jovian planets? A. Jupiter, Saturn, Uranus, Neptune, and Pluto B. Jupiter, Saturn, Uranus, and Neptune only C. only Jupiter D. only Jupiter and Saturn E. everything past Mars and the asteroid belt
B
Which of the following have an icy composition? A. meteoroids B. comets C. meteorites and most asteroids D. most asteroids E. the surface of Mars
B
Which of the jovian moons is the largest and also the largest moon in the solar system, even bigger than Mercury? A. Triton B. Ganymede C.Callisto D. Umbriel E. Titan
B
Which planet by itself contains the majority of mass of all the planets? A. Saturn B. Jupiter C. Uranus D. Venus E. the earth
B
Which planet had the Great Dark Spot in 1989, but had lost it by 1995? A. Saturn B. Neptune C. Jupiter D. Mars E. Uranus
B
Why are Saturn's rings so noticeable? A. Saturn is so bright, the rings reflect a lot of light from both Saturn and the Sun. B. They are made of lots of fresh, bright icy particles from a recent breakup. C. The particles in the rings are highly polished from numerous collisions with other particles. D. They are made of nitrogen frost, like the bright surface of Triton. E. They are made of metallic hydrogen.
B
A lunar eclipse can only happen during a: A. perigee. B. new moon. C. full moon. D. equinox. E. aphelion.
C
A moon that goes inside the Roche Limit will A. collide with a major satellite. B. become a planet. C. be torn apart by the planet's tidal forces. D. escape its planet's gravity.
C
How does the axial tilt of Mars compare with our own? A. Like Saturn, it's about 27 degrees. B. It is about half our own, 12 degrees. C. It is almost identical to the Earth. D. Like Jupiter, Mars always keeps its equator pointing at the Sun. E. Like Uranus, it is 98 degrees and flopped over on its side.
C
In what part of our atmosphere do we live? A. exosphere B. stratosphere C. troposphere D. mesosphere E. ionosphere
C
Our best data about the surface topography of Venus has come from: A. the three flybys of Mariner 10. B. orbiter photos from Pioneer Venus Orbiter. C. Magellan radar data and radar observations of the planet from Earth. D. spacecraft flybys like Mariner 2 and visual observations of the planet. E. radio and visual observations.
C
The Roche limit is the point at which A. the mass of an object classifies it as a moon. B. a moon orbiting a planet experiences synchronous rotation. C. the external tidal forces on an object become greater than the internal forces that hold it together. D. the internal forces that hold an object together weaken so that the object falls apart. E. the external tidal forces on an object are strong enough to be felt by the object.
C
The atmospheric pressure on Venus: A. is about the same as on Mercury. B. shows an extreme change with the seasons. C. is much higher than on Earth. D. causes variations in surface temperature. E.is much lower than on Earth.
C
The planet's orbital period is: A. the time it takes for a satellite to orbit it. B. the time its magnetic field takes to spin once. C. the time it takes to return to the same location in the sky, relative to the Sun. D. the time it takes for it to retrograde back to the same position as we pass it. E. the time it takes it to rotate and have the same face toward us again.
C
The principal greenhouse gases in our present atmosphere are: A. sulfuric acid vapor and carbon dioxide. B. hydrogen sulfide and carbon disulfide. C. water vapor and carbon dioxide. D. methane and ammonia. E. hydrogen and helium.
C
What are constellations? A. Apparent groupings of stars and planets visible on a given evening B. Groups of stars gravitationally bound and appearing close together in the sky C. Groups of stars making an apparent pattern in the celestial sphere D. Ancient story boards, useless to modern astronomers E. Groups of galaxies gravitationally bound and close together in the sky
C
What is interesting about Jupiter's rotation period? A. It is the same as its orbital period. B. It is the same as the Sun's. C. It is the fastest in the solar system. D. It is the same as Earth's. E. It is the slowest in the solar system.
C
What is the resolution of a telescope? A. its ability to see very faint objects B. its ability to make distant objects appear much closer to us C. its ability to distinguish two adjacent objects close together in the sky D. its ability to focus more than just visible light for imaging E. its ability to separate light into its component colors for analysis
C
What is true of the Moon's orbital and rotational periods? A. The rotational period varies with the Moon's phase. B. The orbital period is greatest at full moon. C. They are equal. D. The rotational period is longer. E.The orbital period is longer.
C
When the sun rises it is located in the constellation Gemini. When the sun sets later that same day it will be A. in the constellation Taurus. B. in the constellation Cancer. C. in the constellation Gemini. D. in the constellation Leo. E. in the constellation Aries.
C
Which characteristic listed below describes the jovian planets? A. solid surfaces B. close to the Sun C. low density D. small masses E. slow rotational period
C
Which major atmospheric component is chiefly a product of life processes? A. carbon dioxide B. water C. oxygen D. nitrogen E. hydrogen sulfide
C
Which of the following contributes to Venus being so hot? A. Its atmosphere is much denser than the Earth's. B. It is closer than Earth to the Sun. C. All of the above are factors. D. It has very little axial tilt so the equator is always directly exposed to the Sun. E. Its atmosphere is made chiefly of carbon dioxide.
C
Which of the following is a contribution to astronomy made by Galileo? A. The astronomical telescope can show us far more detail than the eye can. B. Jupiter has four moons orbiting it. C. all of the above D. Venus appears almost fully lit when it lies on the far side of the Sun. E. The Moon has craters, mountain, valleys, and dark flat areas on its surface.
C
Which of these is not a product of plate tectonics and hot spots? A. Hawaii B. Yellowstone and Old Faithful C. the Grand Canyon's eroded depths D. the Mid Atlantic Rift E. the Andes
C
Which of these was NOT seen telescopically by Galileo? A. sunspots B. Four moons around Jupiter C. stellar parallax D. Craters and mare on the Moon D. Venus' phase cycle
C
While watching a star, you see it moves 15 degrees across the sky. How long have you been watching it? A. 1 minute B. 3 hours C. 1 hour D. 15 seconds E. 15 minutes
C
A meteorite is A. a streak of light in the atmosphere. B. a chunk of space debris orbiting the Earth. C. an icy body with a long tail extending from it. D. a chunk of space debris that has struck the ground. E. an irregularly shaped body, mostly found orbiting between Mars and Jupiter.
D
A mountain top is an especially good site for infrared telescopes since: A, less air above means better seeing in many cases. B. the cold weather helps the sensitivity of infrared detectors. C. you are above most of the carbon dioxide and water vapor in the atmosphere. D. All of the above are factors. E. there you are closer to celestial objects.
D
A solar eclipse can only happen during a: A. first quarter moon. B. full moon. C. solstice. D. new moon. E. perihelion passage of the Sun.
D
Which design is subject to chromatic aberration? A. Newtonian reflector B. Gregorian reflector C. Cassegrain reflector D. refractor E. prime focus reflector
D
Earth and Venus are often called sister planets; in which ways are they most alike? A. polar caps and rusty red deserts B. surface temperature and pressure C. atmospheric composition and density D. size, density, and surface gravity E. cloud composition and meteorology
D
How do the densities of the jovian and terrestrial planets compare? A. The closer a planet lies to the Sun, the less its density. B. Made from the same solar nebula, they are all similar. C. No real pattern here; densities vary greatly and are very individual to each world. D. All terrestrials are more dense than any of the jovians. E. More massive jovians all have high densities, compared to the tiny terrestrials.
D
How does the heat Jupiter radiates compare to the energy it receives from the Sun? A. Jupiter is a red dwarf, about a tenth the Sun's luminosity. B. They are equal, as you would expect for a highly reflective planet. C. Jupiter is a brown dwarf, about a hundred times less luminous than the Sun. D. Jupiter radiates back into space about twice the energy it gets from the Sun. E. Jupiter's dark belts absorb most of the solar radiation, so it is cooler in the infrared.
D
How many planet Earths could fit inside the Sun? A. 110 B. close to a billion C. about a thousand D. a little over a million E. almost ten million
D
Mercury's surface most resembles that of which other body? A. Io B. Venus C. Mars D. Moon E. Earth
D
Moonquakes on the Moon were detected by: A. seismographs attached to the Russian Lunar rovers. B. telescopic observations of lunar landslides. C. laser beams reflected off mirrors left on the Moon by Apollo missions. D. the seismographs left these by the Apollo astronauts. E. the radar observations over time from earth.
D
Shepherd satellites are defined as: A. moons that orbit inside the system of rings. B. moons that follow the exact orbit of another, larger, moon. C. a type of moon that orbits another moon. D. moons that confine a narrow ring. E. satellites in the coma of a comet.
D
The greatest contribution of the Greeks to modern thought was: A. that their mythology was the basis for the naming of the constellations. B. the idea that all the planets orbited the Sun. C. the invention of the telescope. D. the development of scientific inquiry and model building. E. that their observation of stellar parallax proved the Earth orbited the Sun.
D
The most abundant component of the atmospheres of Uranus and Neptune is A. Ammonia. B. Helium. C. Nitrogen. D. Hydrogen. E. Methane.
D
The percentage (by number of atoms) of the Sun that is Hydrogen is about A. 27% B. less than 1% C. 9% D. 91% E. 71%
D
What gas is the primary constituent of our atmosphere? A. hydrogen B. carbon dioxide C. helium D. nitrogen E. oxygen
D
What is interesting about Saturn's large moon Titan? A. It is one of Saturn's two large moons. B. It orbits Saturn in a retrograde sense. C. It has a 2:1 resonance with Mimas and a 4:1 resonance with the Cassini gap. D. It has an atmosphere. E. It has its own moon.
D
What is the main constituent of the atmosphere of Venus? A. oxygen B. hydrogen C. nitrogen D. carbon dioxide E. sulfuric acid
D
What is the primary purpose of an astronomical telescope? A. To access wavelengths that we cannot see visually. B. To measure the intensity of light very accurately. C. To magnify and make distant objects appear closer. D. To collect a lot of light and bring it to a focus. E. To separate light into its component colors.
D
What is the result of the Greenhouse effect on the surface environment of Venus? A. It causes the surface temperature of Venus to become hotter than the Sun. B. Its effect is about the same as on Earth. C.It has little or no effect. D. It has raised the surface temperature by hundreds of degrees Celsius E. It has reduced the surface temperature by about 30 degrees Celsius.
D
When the Moon is directly opposite the Sun in the sky, its phase is A. waxing or waning crescent B. waxing or waning gibbous. C. new. D. full. E. first or third quarter.
D
Earth's magnetic field: A. is a remnant of the solar nebula's magnetic field. B. is the force behind plate tectonics. C. is weakening the Van Allen radiation belts. D. lines intersect the atmosphere at the equator. E. prevents charged particles in the solar wind from reaching the surface.
E
How do the atmospheres of the Moon and Mercury compare? A. They are about equal, each only 1% as dense as ours. B. Mercury's is much denser, like Venus, with much carbon dioxide. C. As no spacecraft has yet landed there, no information exists about Mercury's. D. The cooler Moon retains a thicker nitrogen atmosphere. E. Neither body has a permanent atmosphere.
E
How long is a day on Mars? A. 243 Earth days B. 9 hours, 55 minutes C. about 4.2 Earth days D. 23 hours, 56 minutes E. 24 hours, 36 minutes
E
If new Moon fell on March 2nd, what is the Moon's phase on March 14th? A. full B. waxing crescent C. waning crescent D. first quarter E. waxing gibbous
E
If you are in the Moon's umbral shadow, then you will witness A. a total lunar eclipse. B. some kind of lunar eclipse. C. nighttime. D. a partial solar eclipse. E. a total solar eclipse.
E
Mercury is very hard to observe from Earth because: A. its barren surface reflects too little sunlight; it is almost invisible always. B. its very rugged surface does not allow radar to bounce back to Earth. C. it always appears as only half lit from Earth. D. its elliptical orbit causes it to change speed unpredictably. E. it never gets more than 28 degrees from the Sun's glare.
E
Neptune and Uranus have a bluish tint because: A. ammonia ice reflects blue light better than any other color. B. their atmospheres contain hydrogen and helium. C. they are far away and distance makes objects appear bluish. D. at their distances, the Sun appears blue, the red absorbed by dust in the ecliptic. E. their atmospheres contain methane, which absorbs red light.
E
One of the effects of Mercury's very slow spin is A. tectonic activity. B. large variations in the size of its polar cap. C. an intensely powerful magnetic field. D. wind patterns that are slow, but global in size. E. extreme variations in its surface temperature.
E
The Law of Universal Gravitation was developed by: A. Galileo. B. Einstein. C. Copernicus. D. Kepler. E. Newton.
E
The atmosphere of Saturn is composed mostly of: A. carbon dioxide and ethane. B. methane and ammonia. C. hydrogen sulfide and ammonia. D. nitrogen and oxygen. E. hydrogen and helium.
E
The jovian planets A. are all much more dense than any of the terrestrials planets. B. have satellite systems with less than 4 moons. C. all spin slower than the earth. D. all lie less than 5 AU from the Sun. E. all have rings around their equators.
E
The largest shield volcano yet discovered is: A. Maxwell Mons on Venus. B. Prometheus on Io. C. Kilimanjaro on Earth. D. Caloris on Mercury. E. Olympus Mons on Mars.
E
The luminosity of the Sun is a measure of A. the energy emitted by the Sun at the photosphere. B.the energy received by the Sun on Earth's surface. C. the energy received by the Sun at the location of Earth. D. the energy received by the Sun at any location in the solar system. E. the total energy emitted by the Sun in all directions.
E
The main constituent of the Martian atmosphere is A. helium. B. hydrogen. C. nitrogen. D. methane. E. carbon dioxide.
E
The only spacecraft to have visited Uranus and Neptune was: A. Voyager 1. B. Pioneer 10. C. Cassini. D. Pioneer 11. E. Voyager 2.
E
Compared to Earth, Venus spins very rapidly.. A. True B. False
F
Mars appears from Earth to go through all the phases like Venus. A. True B. False
F
Pluto is visible to the naked eye on extremely dark nights. A. True B. False
F
Saturn is the only planet with a ring system. A. True B. False
F
