Sometimes a star appears in the sky quite suddenly. This happens where there are 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.
Fact file
Even with today's most powerful and advanced equipment, there is no visible limit to the Universe. No one is totally sure of the shape of the Universe.
supernovae are explosions of a star in a galaxy that radiates like nova
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