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Black-holes are a space phenomenon that are no threat to human beings, there is one at the centre of our galaxy and whilst it is a strange and very violent place it has been there for a long long time and I could joke and say nobody has ever seen it, but we do know it’s there, scientists have told us.
As an example as to why it is no threat to us consider this. If our sun were to stop shining suddenly we would not be aware of it for a full eight minutes, because that is the time it takes for the light from the sun to reach us here on earth.
Now the nearest black hole is the one at the centre of our galaxy and our galaxy is many light years across, a light year is the way we measure the enormous distances across space. We cannot do this in miles, the numbers are just too big for our reasoning.
You can work it out, the sun is about 93 million miles away, and light travels that distance in eight minutes so divide a year by eight minutes and multiply that figure by 93 million miles and you get a large number of miles, that’s a light year.
It’s impractical to think of miles when you are thinking about space, distant stars are millions of light years distant from Earth, when we think about, photograph or record these stars, we are recording what they were like millions of light years ago, we don’t know what they are like today.
The biggest known black hole is four lights Days in diameter this equates to 70,000 million miles, and remember the sun is 93,million miles away from the Earth
How can we be sure that what science is telling us is actually a true picture of the universe? we know that as we go faster time actually slows down, we also know that the universe is expanding and everything that we are looking at are travelling at different speeds, and this means some parts have different times.
The world is a weird and wonderful place and if you include the universe in your thinking things get more weird and more wonderful the more you think about it.But do not worry about such things, it has been like this for thousands of years and it's not likely to change soon. Home Page - black-holes-video2