Astronomy Unit Quiz #2 Practice

Which list of three planets and Earth’s Moon is arranged in order of increasing equatorial diameter?

• Earth's Moon, Pluto, Mars, Mercury

• Pluto, Earth's Moon, Mercury, Mars

• Mercury, Mars, Earth's Moon, Pluto

• Mars, Mercury, Pluto, Earth's Moon

Which planet is approximately 20 times farther from the Sun than Earth is?

• Jupiter

• Saturn

• Uranus

• Neptune

Compared to the Jovian planets in our solar system, Earth is

• less dense and closer to the Sun

• less dense and farther from the Sun

• more dense and closer to the Sun

• more dense and farther from the Sun

In the diagram, what happens to the satellite's orbital velocity as it moves from points A-D?

• Decreases, then increases

• Increases, then decreases

• Increases

• Stays the same

Which object in our solar system has the greatest density?

• Jupiter

• Earth

• the Moon

• the Sun

Which planet’s orbit is most nearly circular?

• Mercury

• Venus

• Earth

• Neptune

At which point does Halley's Comet have the fastest orbital velocity/speed?

• A

• B

• C

• D

If the last time Halley's Comet was closest to the Sun was in 1986. If Halley's Comet has an orbital period of 76 years, when will it be at this point again?

• 2024

• 2040

• 2062

• 2100

The period of time each of planet takes to orbit the Sun depends on its average

• distance from the Sun

• equatorial diameter

• density

• rate of rotation

If a newly discovered exoplanet has a density that is 30% as dense as Earth, what would its density be?

• 5.5 g/cm3

• 165 g/cm3

• 1.7 g/cm3

• 2.8 g/cm3