Another Year, Another 20 Billion Kilometers Through The Universe

Scientific American ^ | 12/30/15 | Caleb A. Scharf

[onedoug]

An interesting New Year’s Eve thread.

Thanks for posting.

[TigersEye]

Just slow it all down enough so I can get off.

Oh, I almost forgot, thanks for all the fish!

[Graybeard58]

The snag to evaluating such displacement is that on the biggest scales of an expanding and centerless gulf of spacetime

Obammymammy would disagree with that, he's the center of the universe, everything revolves around him. He said it, it must be true.

[TigersEye]

That would make him the biggest black hole of all.

[roadcat]

I’ve always been bothered when watching science-fiction movies about time travel, because of us bobbing around the Universe through time. If one travels backwards through time, the Earth will most certainly not be in the same position in the Universe. A hapless time-traveller will find themselves marooned far from Earth. (Unless you’re Dr. Who in the Tardis, which can relocate in space as well as time!)

[odawg]

Reminds me of the statement by a scientist that if you could see good enough, you would be able to look out into space and see the back of you head.

[DigitalVideoDude]

A classic flick from my yout.

[UCANSEE2]

since force is only experienced as changes in velocity,

Each day we have a change in velocity. During the day our rotation speed is subtracted from our orbital speed, at night it is added.

Yet we feel nothing.

[SpaceBar]

The fact that you as a human being don't feel small accelerations doesn't change the physics. It just means you are a crude and clunky piece of lab equipment lacking the necessary sensitivity.

[SunkenCiv]

Thanks LibWhacker, extra to APoD.

[UCANSEE2]

I’d have to agree with that. We don’t even notice the ground moving beneath our feet.

[apostoli]

“...No offense, but it still doesn’t explain how “physical” can become infinite. Are we physical or not? (and I don’t reference pajama people) Perhaps that’s why the symbol for infinity is a Mobius strip? All above light hearted and I thank you for the reply, Happy New Year.”

Yep we are physical and we are also waveform. That’s the beauty of the mystical. And science and mystical caught up with each other in Heisenberg. Science can show (science is simply repeatability) one proton/electron (physical) being a wave and visa versa, just depends upon the ‘observer’, what i call one’s ‘perspective’; see:

https://www.youtube.com/watch?v=DfPeprQ7oGc

[Textide]

Yet another reason why we never see any time travelers from the future. They all end up in intergalactic space since we’ve moved!