What is some information about black holes

Black holes - we know that

More than 200 years after the British scholar John Michell pondered the gravity of stars and thus predicted black holes, researchers now claim to have photographed one for the first time.

In the galaxy M87, more than 50 million light years away from us. Astronomers aimed radio telescopes all over the world at the center of this galaxy, in which they suspected a black hole.

Then they subsequently combined the recorded signals from the various observatories. In this way, they achieved a resolution that corresponds to that of a radio telescope whose bowl is as big as the earth.

You could recognize a pin head in New York - seen from Germany! In the picture obtained after months of work you can see a halo of hot matter orbiting the black hole. In the middle a black outline that swallows everything - including light.

So far only indirect evidence of black holes

The photo is said to be the first visible evidence that black holes really exist. So far, astronomers have only found indirect clues: They have tracked stars and gas clouds that are attracted to an invisible object in the center of our Milky Way.

The stars and clouds of gas orbit this black hole at high speed, up to a third the speed of light. The researchers therefore suspected that the object from which the suction was emanating must be a black hole.

Astronomers also see indications of black holes in gravitational waves, which were measured for the first time in 2015. The waves are said to have originated during the collision of two black holes.

Gravitational waves make space and time wobble. Even on earth, distances have been stretched and compressed. However, the movement was so small that researchers could only measure it with highly sensitive lasers.