Astro Glossary

  • African Astronomy and Skylore

  • Age of the Universe

  • Airborne Observatories

  • Aldebaran

    The brightest star of the constellation Taurus. It is a red giant star, and is about 67 light-years away.

  • Alpha Centauri

    The closest star system to the Sun, at a distance of more than four light-years, Alpha Centauri consists of three stars. Two of the stars — one of which is similar to the Sun, while the other is a little smaller and cooler — form a tight pairing. The third, known as Proxima Centauri, is about one-tenth of a light-year from the other two, and is a red dwarf star. It is closer to Earth than the other two stars, but it is so faint that it is not visible to the unaided eye.

  • Altair

    The brightest star of the summer constellation Aquila, the eagle. It is a main-sequence star, shining pure white, and is about 17 light-years from Earth. It forms one point of the Summer Triangle. Its name means “the flying eagle.”

  • American Indian Astronomy and Folklore

  • Anatomy of Galaxies

  • Ancient Astronomy

  • Ancient Observatories and Monuments

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