Although scientists know much about the Universe, there are still many strange thing in space that have not been fully explained black holes are the most mysterious. It seems that they exist, but they can never be seen !
Anything that falls into a black hole can never come out again because gravity will crush it to nothing.
BLACK HOLES
Some very rare stars contain as much material as fifty or more suns. They are the brightest stars in the universe yet they turn into black holes- the blackest object in space
- when these stars die they keep on shrinking, because the pull of gravity is so strong
- They shrink down to a ting speck, called singularity or black hole
- Although tiny, the black hole contains all the material from the huge star
4 A black hole's gravity is so strong that no light can escape from it - Astronomers have not seen a black hole, but they have found stars they think may have a black hole nearby.
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Quasars are very distant that send out far more light than ordinary galaxies. They may also send out strong radio waves.
• Quasars seem to be sending out tremendous energy from a small space inside them. This could come from gas whirling around a gaint black hole at the centre of the galaxy.
• The name 'quasar' is short for quasi stellar (star-like) object.
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