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Astrobiology Glossary

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Term Definition
Ultraviolet (UV) Electromagnetic radiation with shorter wavelengths and higher energies and frequencies than visible light. UV light is lower in frequency than X-rays.
Universe The totality of space and time, along with all the matter and energy in it. Current theories assert that the universe is expanding and that all its matter and energy was created during the Big Bang.
Uranus The third largest planet in the solar system and the seventh from the Sun. Uranus is 19 times the Earth's distance from the Sun and completes a circuit around the Sun in about 84 Earth years. This gaseous, giant outer planet has a visible ring system and over 20 moons, the largest of which is Titania. Uranus is tipped on its side, with a rotation axis in nearly the same plane as its orbit.

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Quote of the Day

The historic ascent of humanity, taken as a whole, may be summarized as a succession of victories of consciousness over blind forces in nature, in society, in man himself.
- Leon Trotsky (1879 - 1940), Russian revolutionary.

Quiz Me

How fast do the Leonid meteorites travel when entering the atmosphere?
54,000 mph
87,000 mph
121,000 mph
156,000 mph
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Fact of the Day

In England, a stone is equal to 14 pounds, a kilogram to 2.2 pounds.

Word of the Day