W
W
Wavelength
The distance between two neighboring peaks or troughs of a wave.
White Dwarf
A type of star which is very old, having cooled off and stopped nuclear fusion reactions. A white dwarf is supported by "electron degeneracy pressure" (no two electrons can be in the same place at the same time). These are produced when a star is not heavy enough to turn into a Neutron Star or a Black Hole.
Worm Hole
A tube in spacetime which connects two widely separated places in the Universe. Wormholes could provide the possibility of time travel, though they would probably be very unstable, and only exist for a short period of time.
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