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Science | Dictionary | Astronomy Terms

Astronomy terms are used to describe the various phenomena in space. In this section you can learn what every astronomy term means and how it helps us to better understand the cosmos.

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Unidentified Flying Object

Unidentified Flying Object, or UFO, an object or light that cannot be readily explained as being man-made or of natural origin.


Is there a speed of darkness?

 Is there a speed of darkness?

We know that darkness is a force all it's own, but how would we measure it's speed? Learn if the speed of darkness exists at HowStuffWorks. See more »

10 Scientific Words You're Probably Using Wrong

 10 Scientific Words You're Probably Using Wrong

What are 10 scientific words you're probably using wrong? Find out 10 scientific words you've been misusing at HowStuffWorks. See more »

How did the universe begin?

 How did the universe begin?

The universe and how it began is explained in this article from HowStuffWorks. Learn about the origins of the universe. See more »

What existed before the big bang?

 What existed before the big bang?

Before the big bang, the universe existed as an incredibly small singularity. Learn about what existed before the Big Bang. See more »

What are dark matter and dark energy?

 What are dark matter and dark energy?

Dark matter and dark energy are part of the fabric of the universe. How much do scientists know about dark matter and dark energy? See more »

 Quasar

Quasar, or Quasi-stellar Object (QSO), a star like object displaying an unusually large red shift. Learn more about Quasars at HowStuffWorks. See more »

The Ultimate Meteorite Quiz

 The Ultimate Meteorite Quiz

This meteorite quiz will test your knowledge of these giant space rocks. Test yourself with this meteorite quiz. See more »

 Aberration of Light

Aberration of Light, a phenomenon in which a star or other celestial body, as viewed from the earth, appears to be slightly displaced from its true position. This phenomenon, which was first explained by the English astronomer James Bradley in 1729, ... See more »

 Albedo

Albedo, in astronomy, the reflecting power of a celestial body that is not self-luminous. Albedo is stated as a decimal fraction between 1 and 0. An albedo of almost 1 indicates a bright surface that reflects most of the light that strikes it. An obj ... See more »