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On This Day
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Space - Glossary
Universe
Everything which is known or thought to exist in space.
Star
A ball of gas that produces its own heat and light from nuclear ...
Solar wind
The high-speed stream of electrically-charged atoms of gas sent out ...
Solar System
The system of our Sun. It consists of the nine planets and their ...
Satellite
A natural or artificial object that circles around another. The Moon ...
Red shift
The reddening of the light from a star, indicating it is moving away.
Radio telescope
A special kind of telescope designed to collect radio waves from ...
Quasar
An extremely bright and distant object, much smaller than a galaxy ...
Pulsar
Very small, fast-spinning star which sends out a flash of radio waves ...
Planet
An object which has no light of its own but shines by reflecting a ...
Orbit
The curved path taken by a natural or man-made object as it moves ...
Nebula
A cloud of gas and dust, sometimes dotted with clusters and stars. ...
Light year
The distance light travels in one year, 5.9 million, million miles ...
Gravity
All objects in space attract each other by gravity. It is the ...
Galaxy
A giant group of stars held together by gravity. The largest galaxies ...
Eclipse
This occurs when the Earth passes between the Sun and the Moon and ...
Constellation
A group of stars which appear to make a shape or pattern in the sky. ...
Astronomical unit
The average distance from Earth to the Sun, about 93 million miles ...