There is almost no atmosphere on the Moon because ...
its low mass is not enough to hang on to its atmosphere at its temperature, so the atmosphere escaped to space.
Asteroids are ...
rocky bodies smaller than a planet often found between the orbits of Mars and Jupiter.
From the Earth, Mercury is difficult to see mostly because it ...
always appears close to the Sun in the sky.
Comets were proven to be beyond the Moon by Tycho Brahe. He did this by observing ...
a parallax angle smaller than the Moon's.
The energy produced by the Sun comes from...
nuclear fusion, similar to the energy produced in a hydrogen bomb.
The position of the Sun within the Milky Way Galaxy is best described as ...
in the disk, slightly more than halfway out from the center.
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