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All stars begin as dust and tiny particles in a cloud of gas called nebulae. They develop into stars by passing through several stages over a period of millions of years. Once a star is born, it emits heat, light, x-rays... More »

www.reference.com Science Astronomy Stellar Astronomy

The Star of David is also called the Shield of David. It did not emerge as a symbol of Judaism until the Middle Ages and was not popularly associated with Judaism until after World War II. Prior to its association with J... More »

www.reference.com World View Religion Judaism

Betelgeuse is located on the shoulder of the Orion constellation and is one of the brightest stars in the sky. It is classified as a supernova and is predicted to explode within the next million years. Because it is 640 ... More »

www.reference.com Science Astronomy
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A protostellar disk is created as the gas and dust of a stellar nursery collapse gravitationally in a process that eventually creates stars and solar systems. As the gas clumps together at the center of the cloud, physic... More »

www.reference.com Science Astronomy Stellar Astronomy

The Milky Way Galaxy is made out of dark matter, dust, gas and billions of stars. Scientists believe that most of the Milky Way is made out of dark matter. More »

www.reference.com Science Astronomy Stellar Astronomy

Usually several light years across, a nebula is an extremely large cluster of clouds and dust often found between stars. Nebulae are made of many elements including carbon, hydrogen and helium. More »

www.reference.com Science Astronomy Stellar Astronomy

Galaxies are made of stars, dust and dark matter, all held together by gravity. They come in a variety of shapes, sizes and ages, and many have black holes at their centers. More »

www.reference.com Science Astronomy Stellar Astronomy