No spacecraft have successfully landed on the surface of Mars,but it has been mapped with satellites orbiting the planet.
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Q5: Naked-eye observations of Mercury are best made
Q6: Venus's atmosphere is extremely hot and dense.
Q7: Opposite the Caloris Basin,a huge crater on
Q8: Venus appears almost completely featureless with neither
Q9: Valles Marineris on Mars is thought to
Q11: Venus has a relatively thin crust that
Q12: Mars's atmosphere experiences a runaway icehouse effect
Q13: Hot-spot volcanoes on Earth are only found
Q14: Mercury's scarps,numerous long cliffs,were probably formed as
Q15: Jupiter's moon,Io,may have as many as 300
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