The Planets Review

Scientists believe a liquid water ocean might exist on which moon?

• Titan

• Mimas

• Europa

• Triton

Which of the Jovian planets is tilted by about 90 degrees to its orbital plane?

• Saturn

• Neptune

• Jupiter

• Uranus

What is the Great Red Spot?

• A place on Jupiter's surface where comet Shoemaker-Levy landed in 1992

• A huge spinning vortex larger than Earth in Jupiter's atmosphere

• Another name for Jupiter

• A region of gas on Jupiter's surface that contains a great deal of iron

Why do Earth and Venus have active interiors, while Mercury and Mars do not?

• Nons of these choices is correct.

• Mercury and Mars have small iron cores, while Earth and Venus have large ones.

• Earth and Venus have rapid rotations, while Mercury and Mars do not.

• Earth and Venus are moch more massive, and cool more slowly, than Mars and Mercury.

The atmosphere of Venus consists mainly of ________.

• carbon dioxide

• nitrogen

• oxygen

• hydrogen

Why will astronauts probably never set foot on any of the Giant Planets?

• Their clouds are so hot that any spacecraft getting near it would burn up.

• Their gravitational attraction is so weak that they would float off.

• These planets have no solid surfaces for them to land on.

• Astronauts will land on the Giant Planets--the idea is perfectly reasonable.

What is the largest satellite (moon) in the Solar System?

• Jupiter's moon, Ganymede

• Neptune's moon, Triton

• Saturn's moon, Titan

• Earth's moon

Which reason best explains why both Venus' and Mars' atmospheres are primarily carbon dioxide, but Earth's is much less than 1% carbon dioxide?

• Earth's rocks had much less carbon and oxygen in them.

• Plant life has existed on Earth for an extended amount of time.

• Venus and mars, being smaller than Earth, can't retain the same mixture of gases as Earth.

• Each planet has a significantly different surface temperature.

The iron and rocky cores found inside Jupiter and Saturn are closest in size to

• the Moon.

• an asteroid.

• the size of Jupiter and Saturn themselves.

• Earth.

The Roche limit refers to a ________.

• distance

• mass

• velocity

• temperature