Black Holes.

Black Holes

• Definition: A black hole is a place in space where spacetime exhibiting such strong gravitational effects that nothing,not even particles and electromagnetic radiation such as light can escape from inside it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. 
• Black holes are formed when a star is about to "supernova".A supernova means a star exploding at the end of it's stellar lifespan.Among renowned scientists there is general consensus that supermassive black holes exist in the centers of most galaxies.
• Astronomers have identified numerous stellar black hole candidates in binary systems, and established that the radio source known as Sagittarius A*, at the core of our own Milky Way galaxy, contains a supermassive black hole of about 4.3 million solar masses. 

• A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole. But scientists can see how the strong gravity affects the stars and gas around the black hole. Scientists can study stars to find out if they are flying around, or orbiting, a black hole.

• When a black hole and a star are close together, high-energy light is made. This kind of light can not be seen with human eyes. Scientists use satellites and telescopes in space to see the high-energy light.

• Now the big question arises , can a black hole destroy our planet earth? No,Earth will not fall into a black hole because no black hole is close enough to the solar system for Earth to do that.
• So,next time you seen at the sky at night,try to imagine what would it look like if a black hole was about to digest our galaxy.  

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