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Novae and supernovae

 Q:   Ask a Question about Novae and supernovae       
Novae and supernovae Stars are born as huge masses of interstellar gas condense, eventually becoming so large that their own gravity forces the molecules together and begins the fusion reaction that will power the young star for millions of years.

A nebula is a huge mass of gas and solid material that appears to be solid. However, it is mostly composed of dust and gas, slowly condensing into stars.

Sometimes a star appears in the sky quite suddenly. This happens when there is a pair of stars rotating together. These are called binaries, and there is usually one large star called a red giant, orbiting with a smaller, hotter star. The nova takes place when gas is drawn from the red giant into the smaller star, where the heat causes a massive explosion and emits huge amounts of light.

A supernova takes place when a star collapses as it begins to burn out, then suddenly explodes, producing a huge amount of light energy, and leaving behind a tiny core of neutrons, which is the heaviest substance in the Universe. A pinhead-sized mass of neutrons weighs many thousands of tones.

No one has yet shown that life exists on other planets. However, as there are billions of stars, some with planets, it seems unlikely that Earth is the only place with the right conditions for life. Astronomers use radio telescopes to search for messages from other civilizations.

In 1963 they thought they had found the first traces of intelligent extraterrestrial life when regular pulses of radio waves were detected. In fact they had found strange distant galaxies called quasars.


Tags: stars, nebula, life



Category: Astrology  - ( Astrology Archive)

Date Added: 09 December '11


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