quote:

Originally posted by Skins2881:
There's actually less gravity in space than on earth. That's why the people in the funny suits float.

{takes out small notebook, writes something in it, puts away notebook}

The gravity in orbit isn't much less than at the surface. Centripetal force at orbital speed equals gravity at that distance, so the object neither falls nor rises.

But I'm not sure how this relates to time dilation wrt relativity.

I took a lot of physics in college, especially quantum mechanics and semiconductor physics. Likely 80% of what I learned is now obsolete, and most of the remaining 20% is only vaguely remembered.

quote:

Originally posted by Expert308:
That's one thing I don't get. How can anything that physically exists, have zero mass? Small enough that we don't have a device sensitive enough to measure it, OK. But zero? That just doesn't seem to make logical sense.

Then again, NOTHING down in that quantum world really makes sense, does it?

The way to look at it is that ALL subatomic particles are massless until the Higgs Boson (the so-called God Particle) connects some particles (not all) to the univeral Higgs Field. The Higgs Field is like syrup, and causes the particles to slow down to the point they can interact with each other and form atoms and molecules, the fundamental building blocks of our physical universe.

Without the Higgs Boson, all particles would be zipping around the universe at the speed of light and not interacting with each other. They would still exist, just not in a way that's "physical" as we're used to.

Watching Professor Brian Cox 'explaining' that I felt like a dog watching TV.

Wait 'till you guys find out that time is three dimensional!

quote:

Originally posted by Shaql:
Wait 'till you guys find out that time is three dimensional!

Sabine says that's rubbish. I like Anton, but in this case my intuition says Sabine's correct.

Not that I understand the crazy math behind any of it.

^^^^^^
Sabine?

quote:

Originally posted by Pipe Smoker:
^^^^^^
Sabine?

Probably Sabine Hossenfelder.

quote:

Originally posted by WaterburyBob:

Probably Sabine Hossenfelder.

Article: https://sciencereader.com/time...es-physicist-claims/

^^^^^^
Thanks for that video. I got a good chuckle or two.