/sci/ - Science & Math

[Anonymous No.4929106]

>"even light cannot escape black holes"
>implying photons have mass
>2012
>science
>mfw

[Anonymous No.4929108]

> vlcsnap-2012-05-02-22h41m47s122.png
>-3/10

[Anonymous No.4929112]

what the fuck does mass have to do with it?

[Anonymous No.4929130]

This is relevant. It always makes me laugh when I stumble upon it in my image folder from time to time. It sums up the discussion pretty well.

[Anonymous No.4929141]

>>4929106
>>4929112
>doesnt realize photons have mass
Scientists and their confused definitions

[Anonymous No.4929149]

Learn2General Relativity, please.

The future light cone of any event within the event horizon of the black hole is entirely within the event horizon of the black hole. ds^2=0 is a cone with decreasing radius for increasing time.

[Anonymous No.4929151]

Actually mass is irrelevant when trying to leave an objects gravitational field. It's the speed that matters. "Escape velocity" is the technical term. Mass only determines the energy needed to reach the necessary velocity by acceleration.

So in case of black holes, coming back beyond the event horizon would require a velocity greater than the speed of light, which is impossible to achieve because of the infinite energies required. Also, the "insides" of a black hole aren't understood, so it might actually even be impossible to say _why_ exactly it is impossible to "escape" one. Mathematics say that beyond the event horizon, time and space "switch roles", ie you get to the event horizon and for you, you remain there for an eternity (which isn't the case, in reality, because you'ld be ripped to shreds well before).

There are some more interesting points on this topic, but the hour is late and I don't have any actual education in physics yet, so I'll just leave it at here.

Correct me if i made any factual mistakes.

[Anonymous No.4929439]

>>4929130
Ahaha, oh man, thats so funny and true and sad all at once.