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The most common gas in the atmospheres of Mars and Venus is _____. The most common gas in the atmospheres of Jupiter and Saturn is _____.

Venus and Mars have about the same percentage of CO2 in their atmospheres. However, only Venus has a strong greenhouse effect because _____.

The retrograde spin of Venus and the 98 degree tilt of the spin axis of Uranus are thought to be due to _____.

Consider the following list of items:Which of the items on the list were used to discover the high surface temperature of Mercury?

Mercury is similar in size to many of the moons in the solar system. However, Mercury’s _____ is much _____ than that of the moons.

The radius of the Moon is R=1.7 x 108 cm and its mass is M=7.4 x 1025 g. From these values, we conclude that the volume is _____ and the mean density ρ is _____. Hint: the volume V of a sphere of radius R is given by the formula V = (4/3) π R3 and the average density ρ is given by the formula ρ=M/V.

Venus and Mars have about the same percentage of CO2 in their atmospheres. However, only Venus has a strong greenhouse effect because _____.

Based on radioactive dating of lunar samples bought back to Earth by the Apollo astronauts, we now know that the highlands are actually _____ years older than the maria. This implies that _____.

The theory for the Moon’s formation thought to be most likely is _____. There is some evidence that the Earth originally had _____.

Mercury is similar in size to many of the moons in the solar system. However, Mercury’s _____ is much _____ than that of the moons.