This is a question straight from Resnik-Halliday,although i cudn't find the answer anywhere in the book.(I got to know it frm a TV program)
We all know that a black-hole is a star that has collapsed into itself so that it has a very high value of gravity.so high that not even light can escape from its surface.IF light cannot escape from its surface then how can we dectect a Black-Hole!!
The answer is based on common sense.its nothing much to do with scientific knowledge.
1thats y we can see it bcoz evrything around it reflects light and thus it appears black. i'm nt sure of da answer
62This is a very simple question..
I will give you the best answer in a way without giving the answer
Look at thsi image... do you have the answer now?
1Well the answer is not that tough as i said before.The image provided is very gud(Though i wanna ask how did u upload the image).Avtually we never see the black hole.The nature of the particles or the composition of the materials around the black hole gives us an specific idea that a black hole exists there.Otherwise a black-hole is not physically visible.