What’s the source of gravity? (a common physics misconception)

Fun fact! It takes 1.5x10^60 photons at 550nm to mimic the gravitational pull of earth!

Strictly speaking objects don't attract each other, but rather, as their presence distorts spacetime the geodesics (straight line paths) they naturally follow are bent towards each other.

Now I want to make 2 huge light waves that are momentum enough to circle each other.

But isn't mass proportional to energy? Given that certain density is for a certain size of celestial body

I never truly understood this. Newtons law of gravitation says gravitational acceleration is independant on ones own mass, so it does still predict that light will bend around massive objects, or doesn't it?

E=mc2

Henry you're explaining an abstract model about the calculations which have been created for pragmatic purposes. You're describing how gravity works in this particular model, not what it is or what is it's origin (in the ontological sense). Otherwise great short mate

This is how Kugelblitzes would work (as a sci-fi weapon).

Essentially, aliens could position tech in a sphere a lightyear away from Earth all pointing in. If they simultaneously directed absurd amounts of light from all sides to hit a target at once then, the target would have no warning before an attack was coming, up until the exact moment Earth gets slammed with light energy density strong enough to form black hole.

Aside form the absurd impracticality of that maneuver, we still don't know how realistic the theory is. A semi-recent paper that hasn't been peer reviewed yet argues the Schwinger effect might start spontaneously generate matter in these super strong electromagnetic fields. Creating matter would decay that field en route, thus dispersing the energy of that light based weapon before it could ever form a black hole.

I reasoned that if force of gravity = Gm1m2/(r^2) and F=ma, if you divide by m on both sides you get acceleration of gravity = Gm2/(r^2). However, considering the limit as m1 approaches 0 is nice only because it is using a cheap approximation. Whereas I would want to use theory of relativity to prove that gravity affects light.

If you create a really slow electron by ionizing an atom with a precise amount of energy and let it fly near a strong laser, could you change it's path? Or is the amount too small to measure?

Neat!

Photons (light) are Guage bosons and cannot interact with other bosons, like the hypothetical graviton, thru exchange of energy. While they have momentum, two photons cannot bounce of each other; they can only interfere with each other either constructively or destructively, and only while they occupy the same space.

But it's appears to escape velocity when it plopsters.

Wait... Does light bends or is the "Space-Time fabric" (where light is traveling) that bends?

"General Relativity us better."

Go Einstein!

I think this is a good opportunity to explain that how we perceive reality has little to do with what reality actually is

We've returned to the videos being a minute long... we've come full circle

Ahhh, so by virtue of a large mass having a lot of inertia, it bends gravity

I remember something from a Randall Munroe "What If...?" video. For lasers with high enough energy density, space is no longer transparent. Much like you experience a gravitational pull from every single thing on and in Earth, the photons on the edge of the beam experience a gravitational pull towards the center. This causes the photons to start colliding with each other and create something akin to a solid wall

I see, so moths are attracted to light by gravity. Verrrry interesting.