Why do black holes have such strong gravitational pull?

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Black holes have a strong gravitational pull because gravity affects all forms of mass and energy, including light, which is why they appear black. Albert Einstein's theories demonstrate that mass bends space-time, influencing the path of light. Even though photons are massless, they carry energy, which allows them to be affected by gravity. This understanding clarifies why black holes can trap light, making them invisible. The concept of gravity bending space can be visualized as a trampoline being warped by a heavy object.
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Why are black holes black even though light(photons) has no mass? Gravity shouldn't affect it.
 
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Mabcs said:
Why are black holes black even though light(photons) has no mass? Gravity shouldn't affect it.


Gravity does affect light. I think even Isaac Newton suspected that. Albert Einstein calculated the effect of gravity on light, and he was right. As far as we can tell, black holes behave quite as he predicted, even though he neither knew nor believed they existed and didn't like the idea.

The modern view is that mass bends space. Everything is effected by that, mass or no mass. In fact, all masses move through space the same way. It doesn't matter how heavy or dense they are, what shape, etc. Space bends the same for everything, light included.

It takes a little getting used to, but it makes sense.
 
Thinking about a typical representation of gravity in the classroom, just picture a trampoline with a bowling ball on it. The mass warps the fabric of space time. As stated above by ImaLooser, Einstein calculated the effect of gravity on light. Since light is affected by gravity, it is then easy to see how black holes are black. Once you can understand that light, although massless, is affected by gravity, the rest of your question falls into place.
 
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Hi Mabcs! Welcome to PF! :smile:
Mabcs said:
Why are black holes black even though light(photons) has no mass? Gravity shouldn't affect it.


energy is mass, mass is energy

light has energy, so light has mass

(it doesn't have rest-mass :wink:)
 

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