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What is a black hole?
Black holes are extremely compact spaceobjects that were once massive stars. Sometimesa huge star begins to shrink until it is smallerthan an atom. This is called a black hole. Thecentre of the black hole is called ‘singularity’. The gravity near this point is so strong that anyobject that gets too close to the black hole …
What is a white dwarf?
A small star usually shrinks to form adense white dwarf. The size of a white dwarfis similar to the size of Earth. There are manywhite dwarfs in our galaxy but they are toodim to be seen. Sirius B is one of them White dwarfAn enhanced image of white dwarf stars, which havealready shrunk to a …
What is a supernova?
A supernova is a vast explosion inwhich an entire star is destroyed. After theexplosion, extremely bright light is emittedfor several days. Supernovas appear a billiontimes brighter than the Sun. Sometimes, asupernova explosion can go on for weeksor even months. Supernovas mostly occur indistant galaxies. The last supernova to takeplace in the Milky Way occurred in …
How long does a star live?
A star glows for millions of years until thegases in its outer layer begin to cool, and thehydrogen in the inner core is slowly used up.The cool outer layer starts to glow red. Whenthis happens the star is called a red giant. Thered giant continues to lose its brightness untilit fades away. Depending on its …
What is a protostar?
Stars are born in clouds of dust andgases, mainly hydrogen. More and more gasis pulled together by gravity to form a cloud.After a while the cloud begins to spin. Thismakes the gas atoms bump into each other athigh speeds, creating a great deal of heat. Asthe cloud becomes hotter a nuclear reactiontakes place inside, and …
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