Astronomy chapter 2 homework

If Earth's rotation slowed down so that it completed exactly one rotation about its axis in 100 hours, what would be the typical time interval between sunrise and sunset? 1. 100 hours 2. 24 hours 3. 50 hours

50 hours

What do astronomers mean by a constellation? 1. A constellation is any random grouping of stars in the sky 2. A constellation is a region in the sky as seen from Earth 3. A constellation is a group of stars related through an ancient story 4. A constellation is a group of stars that are all located in about the same place in space

A constellation is a region in the sky as seen from Earth.

When we see Saturn going through a period of apparent retrograde motion, it means: 1. Saturn and Earth must be on opposite sides of the Sun. 2. Earth is passing Saturn in its orbit, with both planets on the same side of the Sun 3. Saturn is temporarily moving backward in its orbit of the Sun

Earth is passing Saturn in its orbit, with both planets on the same side of the Sun.

Polaris is 10 degrees above your horizon. Where are you? 1. Latitude 80 degrees north 2. Latitude 10 degrees south 3. Latitude 10 degrees north

Latitude 10 degrees north

What is the celestial sphere? 1. The celestial sphere is a model that shows the true locations in space of the Sun and a few thousand of the nearest stars. 2. The celestial sphere is a representation of how the entire sky looks as seen from Earth. 3. It represents a belief in an Earth-centered universe, and hence is no longer considered to have any use.

The celestial sphere is a representation of how the entire sky looks as seen from Earth.

We see two stars separated by one degree on the celestial sphere. What can we infer about these stars? 1. They have similar luminosities. 2. They are very close together in space. 3. They rise and set at about the same time.

They rise and set at about the same time.

About how many stars are visible to the naked eye on a clear, dark night away from city lights? 1. a few hundred billion 2. several million 3. approximately two thousand

approximately two thousand

As Earth goes around the Sun each year, Earth's rotation axis in the North points: 1. tipped toward the Sun, 23-1/2 degrees. 2. in the direction of the celestial pole, near Polaris, throughout the year 3. in a direction that traces a cone of radius 23-1/2 degrees, crossing through Polaris and Vega 4. tipped toward the galactic center, 23-1/2 degrees

in the direction of the celestial pole, near Polaris, throughout the year.

If the Sun rises precisely due east: 1. you must be located at Earth's equator. 2. it must be the day of either the spring or fall equinox. 3. it must be the day of the summer solstice.

it must be the day of either the spring or fall equinox.

The North Celestial Pole is 35∘ above your northern horizon. This tells you that you are at: 1. latitude 35 degrees N 2. longitude 35∘ E. 3. latitude 35∘ S.

latitude 35∘ N.

Two stars that are in the same constellation: 1. must both be part of the same cluster of stars in space. 2. must both have been discovered at about the same time. 3. may actually be very far away from each other.

may actually be very far away from each other.

If there is going to be a total lunar eclipse tonight, then you know that: 1. the Moon's phase is full. 2. the Moon's phase is new. 3. the Moon is unusually close to Earth.

the Moon's phase is full.

The fact that we always see the same face of the Moon tells us that: 1. it must be the day of the summer solstice. 2. the Moon does not rotate. 3. the Moon looks the same on both sides. 4. the Moon's rotation period is the same as the Earth's rotation period.

the Moon's rotation period is the same as its orbital period.

In winter, Earth's axis points toward the star Polaris. In spring: 1. the axis also points toward Polaris. 2. the axis points toward Vega. 3. the axis points toward the Sun

the axis also points toward Polaris.

What is the ecliptic? 1. a half-circle extending from your horizon due north, through your zenith, to your horizon due south 2. the path traced by the Moon's shadow on Earth during a solar eclipse 3. the path the Sun appears to trace around the celestial sphere each year 4. the Sun's daily path from east to west in our sky

the path the Sun appears to trace around the celestial sphere each year

A week after full moon, the Moon's phase is: 1. first quarter. 2. third quarter. 3. new

third quarter.

Beijing and Philadelphia have about the same latitude but very different longitudes. Therefore, tonight's night sky in these two places: 1. will look about the same. 2. will have completely different sets of constellations 3. will have partially different sets of constellations

will look about the same.

When it is summer in Australia, the season in the United States is 1. winter 2. summer 3. spring

winter