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Astronomy: Essential Facts

____ has almost no atmosphere. Mars has a very thin one. 1. Mercury
Uranus and ____ appear blue due to methane in their atmospheres. 2. Venus
Titan is the largest of the 146 known moons orbiting ____. 3. Earth
Galileo observed the four largest moons of ____ in 1610. 4. Mars
____ was the first planet discovered using a telescope (1781). 5. Jupiter
____ has a huge dormant volcano named Olympus Mons. 6. Saturn
Due to its thick CO2 atmosphere, ____ is the hottest planet. 7. Uranus
____ is one astronomical unit (93 million miles) from the Sun. 8. Neptune