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Jim Colyer covers the basics of astronomy.
the moon's. And like the moon, it has no atmosphere. NASA launched the Messenger spacecraft to Mercury to find out why the planet is so dense. Like Mercury, Venus is between the earth and the sun
Tags: Jim Colyer, astronomy, moon, solar system, sun, pl
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Jim Colyer writes about astronomy.
to Earth during opposition, when it is on the opposite side of us from the sun. Opposition occurs every 22 months. The Phoenix Lander is the latest spacecraft to look for life on Mars. Phoenix
Tags: Jim Colyer, asronomy, stars, planets, moon, sun, g
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