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The first strong black hole candidate observed was in an x-ray binary system in constellation Cygnus and is called Cygnus X-1 (so named because it was a strong x-ray source). Observational evidence continues to support the notion that it could only be a black hole; its mass is estimated at a little under 15 times the mass of our sun, with a Schwarzschild radius of about 44 km.

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How did black holes get its name?

black hole got it's name because when look at a black hole, you only see black. also if you drop an item in the black hole the item is gone because there is a hole in there. so that's how black hole get's its name


When was the first black hole?

The first black hole was probably after the first population III star exploded about 13.1 billion years ago. One of which might be the black hole at the centre of our galaxy.


Were did black holes get there name?

The term "Black hole" first appeared in print in an article by Ann Ewing in "Black Holes in Space" published in 1964.


How did black hole got their name?

they are black and their bottomless!


What could you do to escape the black hole?

You can't - that's the whole idea of a black hole. Don't get near a black hole in the first place.


Was the black hole discovered 400 years ago?

No. The idea of a black hole was first proposed in 1783, 230 years ago. The first observations believed to indicate the presence of a black hole were in 1964.


Who was the first person to go into a black hole?

No non-fiction person has ever gone into a black hole.


Can any one go into black hole?

noone can go black hole as the name suggest it is a hole which is black so how any one can go ad com back...


What is the songs name playing during the baseball scene?

Supermassive Black Hole-Muse Supermassive Black Hole-Muse


What is the name of a distant galaxy with a black hole?

As far as we know, most, if not all galaxies have a massive black hole at their centre.


Who is the first man in the black hole?

Nobody has ever visited a black hole. The nearest known black hole is many light years away. Much to far away for us to reach it.


Why is the sun considred a black hole?

First of all, our sun can not become a black hole, it is too small for that. However if a star is three times bigger than our sun, then yes it will become a black hole.