When Is the Earth Nearest the Sun?
The Earth is nearest to the Sun on about the second or third day in January. The distance varies because the Earth spins round the Sun in an
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Earth
Why Does an Astronaut Need a Spacesuit?
A spacesuit enables an astronaut to survive by providing him artificially with conditions like those he is used to on Earth. These condition
How Far Can You See?
How far the human eye can see depends on how many particles of light, or photons, a distant object emits. The farthest object visible with t
What Is the Milky Way Galaxy?
The Milky Way, or Galaxy, is the whole concourse of stars and other bodies which can be seen stretched across the heavens. It includes our o
What Is a Meteorite?
What Is a Meteorite? Meteorites begin as bodies of matter traveling at great speed through space. In the solar system there are numberless s