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V - W - X

Select the letter that (probably) leads off the word in question. Please suggest new words or corrections.



  • Van Allen radiation belts: The belt of radiation around the Earth that shields us from harmful rays emitted by the Sun.

  • Venus: The second planet from the Sun. It is a rocky (solid) planet and is always shrouded in cloud cover. It is also known as the "morning star" or "evening star".

  • variable star: A star that perceptibly changes its illumination. See "Cepheid variable".

  • vernal equinox: A point in the sky where the celestial equator crosses the ecliptic and where the Sun is located on the first day of spring in the Northern Hemisphere. See "Celestial Equator".



  • white dwarf: A small, dense remnants of a sunlike star in its last phase of life. It shines from stored heat.



  • x-ray: A relatively high-energy photon with wavelength in the approximate range from 0.01 to 10 nanometers in the spectrum.


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