A very large ball of burning gas in space that is usually seen from the earth as a point of light in the sky at night...

Luminous ball of hydrogen and helium gas...

Star are giant, luminous spheres of plasma. There are billions of them — including our own sun — inthe Milky Way Galaxy. And there are billions of galaxies in the universe. So far, we have learned that hundreds also have planets orbiting them. Ancient cultures saw patterns in the heavens that resembled people, animals or common objects constellations that came to represent figures from myth, such as Orion the Hunter, a hero in Greek mythology. Astronomers now often use constellations in the naming of stars. The International Astronomical Union, the world authority for assigning names to celestial objects, officially recognizes 88 constellations.


Sun, star around which Earth and the other components of the solar system revolve. It is the dominant body of the system, constituting more than 99 percent of its entire mass. The Sun is the source of an enormous amount of energy, a portion of which provides Earth with the light and heat necessary to support life.


Polaris is the 45th brightest star in the night sky. It is very close to the north celestial pole, which is why it has been used as a navigational tool in the northern hemisphere for centuries. Scientifically speaking, this star is known as Alpha Ursae Minoris because it is the alpha star in the constellation Ursa Minor (the Little Bear).


Canopus, also called Alpha Carinae, second brightest star (after Sirius) in the night sky, with a visual magnitude of −0.73. Lying in the southern constellation Carina, 310 light-years from Earth, Canopus is sometimes used as a guide in the attitude control of spacecraft because of its angular distance from the Sun and the contrast of its brightness among nearby celestial objects. The Syrian Stoic philosopher Poseidonius (c. 135–50 bc) used sightings of Canopus near the horizon in his estimation of the size of Earth.

Star Types

Categorizes 1,000,000,000,000,000,000,000 (that's 1 billion trillion) stars …

WTF Star

KIC 8462852 is an F-type main-sequence star located in the constellation Cygnus approximately 1,470 light-years from Earth. Unusual light fluctuations of the star...