A black hole is, some theories predict, infinitely dense. So can one ever be detected?
Yes, from its effects on nearby things. Yes, the immense gravitational fields surrounding black holes deflect electromagnetic radiation (such as light) passing nearby. This is the only obvious way, as looking straight at one would not reveal it (hence the term 'black'). Anything getting close enough to a black hole to detect it directly would be unable to send any details back to us, as they would be drawn in to the black hole.
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