Astronomers know because they have studied star patterns and placements and know when there has been a change between where there is a black hole and where there isn't one.
We know nothing about the conditions within a black hole, but it seems unlikely that a black hole could exist within a black hole, or even if this concept would have any meaning at all.
No non-fictional astronomical body know as black circle. If the question is meant to employ the term 'black hole' in space, what a black hole does is to exist.
By their gravitational effects.
Time behaves differently in a black hole due to its intense gravitational pull. According to the theory of general relativity, time slows down as you get closer to the singularity at the center of a black hole. This means that time as we know it may not exist in the same way within a black hole.
your atoms will always remain. life as you know it will cease to exist, though. happy trails!
They know because the effect the black hole has on other matter.
No the singularity is at the core of the black hole.
Don't know which black hole.
It is a tricky question because black holes are invisible, but scientists know that they are exist because black holes distort light, so it kind of change the light and also it sucks everything into it, so when scientists see stars starting to disappear, thats mean there is a black hole.
It is a tricky question because black holes are invisible, but scientists know that they are exist because black holes distort light, so it kind of change the light and also it sucks everything into it, so when scientists see stars starting to disappear, thats mean there is a black hole.
Because there is usually nothing around the spot where the black hole is because the black hole "ate" everything.
No, in our universe, virtual assistants exist in the digital realm and do not have physical mass that could collapse to form a black hole. The concept of a virtual assistant turning into a black hole does not apply in our context.