Physicist Brian Greene explains repulsive nature of gravity #astrophysics

[shaneh]

To understand this better, you should know that gravity NEVER pulls anything.. Gravity is only a reaction caused by the stretching, or constricting, of space-time/quantum field. Mass always stretches it, and when it’s stretched it’s always pushing back on the mass, creating the reaction we call gravity. The energy he’s referring to condenses space-time/quantum field to where it’s still pushing to return to its natural form, but since it’s constricting, it’s pushing outward to return to its natural state.

[michaelsteele]

The normal type of gravity that we all experience is a function of an expanding universe. Repulsive gravity would be a function of an imploding universe. Gravity is similar to how a changing magnetic field can induce an equal and opposite magnetic field. This is how transformers work. So gravity is simply a form of conservation of momentum. As the universe expands, mass resists this, and we experience it as attractive gravity. If you really want to understand gravity, start by taking Maxwell's equations for electromagnetc field theory and replace q (charge) with m (mass). This will result in the gravito-inertial field equations. 😎👍

[marvelous]

This discribes how dark energy is responsible for expansion of the universe.

[georgee.]

This is basically describing a magnetic field. The earth is a magnet. This is why what is said is describing magnetism. We live in an electric universe.

[daphneraven]

That’s really beautiful; i’ve never heard the system that makes life on this planet possible explained in quite this way before. Thank you.

[Ma_X]

Equations are just a way to describe nature partially. Do not forget that Maxwell equations (when you doing some electrotechnical calculations for ex.) gives you two solves and one of them is always considered as impossible.

[RLomoterenge]

Mass is the opposite of energy. Mass “attracts” and energy “repels”. Genius!

[garethaustin]

Question: Does ALL mass have gravity, or is there a threshold at which an object has enough mass to exert gravity?

[timothyvenable]

Why have I never heard this before!? I knew the universe was expanding, and heard it was because of dark matter or dark energy… but never explained like this!

[chrisperez]

Sounds exactly what the aliens use on their aircraft

[michaelsteele]

To summarize. A stationary charge will generate an electric field, and a rotating charge will generate a magnetic field. Similarly, a stationary mass will generate a gravitational field, and a rotating mass will generate an inertial field. Further, a changing magnetic field can induce an equal and opposite magnetic field. Likewise, a changing inertial field can induce an equal and opposite gravitational field. In order to maintain the conservation of momentum, as the universe expands, the attractive gravity is induced, trying to pull everything together. Keep in mind that all of this works if the masses involved are spinning.

[beatch]

So then that would explain space expansion

[jamesfortune]

there's only ever been two things in existence most of us have ever heard of having the ability to repeal something being broke and ugly and and a magnet up against another

[mathophile]

Man! I need to study that shit!! I'll do anything now to study that

[TheJim]

I never even thought about that.. but he's right. Sun rays, nuclear waves etc. They all shoot outwards, repels from where it originated.

[coldCoders]

Makes me think about the expanse of the universe as part of repulsive gravity

[AB-nrvp]

It can be a little bit deceiving when explain this way, but he is 100% correct. The only thing is that is deceiving is that one may hear repulsive gravity, and six flying cars when in reality, this reports of gravity simply responsible for the expansion of the universe.

[nathanielbrent]

The laws of magnetism applies equally. Simplest explination.

[Paul-ourx]

So we don't need antigravity, just more repulsive gravity. Or just a way to block attraction gravity.

[andrewhoneywell]

So rocket technology needs to focus on repulsive gravity?