I am proud of
myself that
GLOSSARY
Albedo
Asteroid
Mare
Satellite
Sputnik 1
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in astronomy, the reflective property of planets
a small rocky object found mainly in a belt or flat ring between the orbits of Jupiter and Mars; also called a minor planet because it is so small (the largest are only 200 km across).
a large flat plain on the moon caused by lava flows and marked by ridges, depressions and faults; all 14 maria are on the side of the moon that faces Earth.
a natural (e.g. moon) or artificial (e.g. spacecraft) object that orbits around a larger astronomical body.
the first artificial satellite, which was launched into space to orbit around the Earth in 1957.
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