How do scientist know that a black hole exist if these object don't emit viable light?

Answer 1

Scientists cannot view a black hole directly, but they can see the effects of the black hole in the surrounding space. For example, matter being sucked into a black hole emits radiation which can be detected, or a its gravitational effects on neighboring stars and dust.

Answer 2

If there exits a black hole, its surrounding stars form strange curves like as if the stars are at the end border of a magnifine glass. Its because of the gravity of the black holes. So just like if we cannot see a magnifine glass , but we can assure its presence by observing its background or borders

Answer 3

aah. Astronomers knows because of its effect. Black holes distort lights and it sucks planets and stars into it, so if they see many many stars start to disappear, then that must be the Black Hole action.

and sometimes stars incourse of their celestial motion go on diffrent velocity than they should..... like when they slow down unconditionally or get accelerated there remains no explanation but a black hole.

also for binary stars who rotate one another are sometimes found to be orbiting a single point in space which seems to be pulling them . this is also considered to be due to black holes.

Answer 4

A black hole can be inferred by it's gravitational influence on it's surroundings. Black holes that are part of a binary star system, for example, can be inferred because only one of the stars can be seen. Black holes can also cause x-ray jets as they pull in surrounding matter, and these jets can be used to locate them as well.

Answer 5

Because its gravity is so great that not even light can escape it

Answer 6

They detect the effects of a Black Hole e.g. massive waves of radiation (they were originally called QUAZARS)