Mass and energy are basically the same thing though. Since E = mc² you can substitute mass in any equation with E / c².
Comment on Can you have an infinitely long wavelength of light? Or is there some maximum?
FRYD@sh.itjust.works 5 days agoThe idea that a and very small wavelength would cause a black hole doesn’t really make sense to me since I thought a black hole requires mass. I’m no physicist, so I don’t really know.
A search about light with a Planck wavelength came up with this result which seems to claim that eventually the wavelength would become so small as to no longer be capable of holding information and would essentially do nothing.
yetAnotherUser@discuss.tchncs.de 5 days ago
knightly@pawb.social 4 days ago
What the two other replies have neglected to mention as the cool side-effect of light affecting the curvature of spacetime despite being massless is that it’s theoretically possible to make a black hole out of nothing but light. The concept is called a “Kugelblitz”, en.wikipedia.org/wiki/Kugelblitz_(astrophysics)
remon@ani.social 5 days ago
It’s mass OR energy.
Light, even though massless will still bend (and be affected by distorted spacetime) because it has energy in form of momentum. (See: gravitational lensing).
calcopiritus@lemmy.world 4 days ago
It is affected by gravity. But does it have gravitational pull? The thing about black holes is that they have a lot gravitational pull.
I’m asking because I honestly don’t know.
remon@ani.social 4 days ago
They do indeed. It’s totally minuscule of course.
Everything that has energy deforms spacetime and spacetime affects how anything with energy moves.