1 bit is information. 1 bit, by definition, has two states. For example, the presence or absence of a photon can convey the answer to yes/no questions.

If those aliens sent a light speed signal, they would have to wait 4 years to watch us recieve it in the "past". If the signal were faster than light, let's say instantaneous, they would simply see us recieve the message immediately rather than having to wait the 4 year travel time. So I think the answer is no, the message would not travel back in time

Edit: I forgot about the travel time for light from earth to the telescope. The instant message would be viewed arriving in the aliens 4 year old archived footage but still never traveled back in time. It does break causality though

Yeah. We can even make blue rats!

[removed]

Hey man, do the crazies some justice!

The hollow earthers still believe in the iron core and the mantle and all that, they believe that the lithosphere is pocketed with vast cavernous areas of habital land

Do you have any evidence about the poles switching times during the Roman era? As far as I was aware the last time it happened was like half a million years ago or something, which certainly was not during the Roman era.

[removed]

Oohhhh can we make the signal like a greenish color!?

So NASA leadership acted with the same aptitude as a group of new hires?

With our current understanding of physics, such a thing is literally impossible.

But as a thought experiment, let's say some alien civilization has figured out how to send a signal faster than the speed of light. What would that look like to us? I think it would appear as though a signal blinked into existence, with no discernable origin point. Depending on just how much faster they could send the signal, and how far it travelled, it would probably look like it appeared ahead of an observable planet, like where the planet will eventually end up many years in the future.

Well, since it's an imaginary signal, you can invent what happens.

that's semantics. they have a budget, they decide how to use that money. yes the money comes from taxpayers. but if the National Endowment for the Arts gives a grant the words that are used are "funded by the National Endowment for the Arts"

same thing here

That's completely not true. There are hypotheses about traveling faster than light and sending signals instantaneously that conform with the laws of physics as we know them, we just don't have the technology to confirm these hypotheses and most likely won't for a very long time. You're also wrong about time travel. Technically speaking, you're time traveling at relativistic speeds due to the effects of time dilation. If you're traveling fast enough, you're time traveling simply because you're experiencing time exponentially slower than people on earth. If you're going to talk in absolutes, I'd encourage you to at least read about what you're going to be talking about first.

i think the theoretical answer is YES. We also have physicists who firmly believe that time travel is not just possible, but is in fact now a matter of engineering. Keep a skeptical eye on the nay-sayers. Keep an optimistic eye on those who are trying. At 14, the future is yours. Take it and run!

A 1 bit signal cannot posses information. You'd require a minimum of 2 bits. 1 bit is just a straight line, no breaks.

You need at least two states, on and off. 1 and 0. Line and Gap. So a minimum of two bits.

Entanglement doersn't pass new information. It only passes information that's embedded into the system at the time of interaction, even if it's unknown.

It's like a quarter. You cannot tell if you will flip heads or tails. But the moment you do, you instantly know what you didn't flip.

Nothing new is created, no new information.

Parts from 83 shuttle flights were used on Artemis 1 mission. When the Shuttle program ended, the Orbiters and parts inventory didn't vanish into thin air. Whatever was still usable, they used.

Just a signal 1 bit signal

Not saying that it exist or will ever exist, but if there was a type of signal that could do it, what would happen?

Sending information faster than light, would create a situation in which causality could be broken.

But these are very particular words that mean very particular things.

Is a signal information? Only if it passes novel information. Entanglement does not.

There's no such thing. The speed of light is an absolute limit. There's no such thing as time travel, either.

That said, even ordinary light from another star is from the past. If it's 4 light years away it's for years in the past. If it's 100 million light years away it's 100 million years in the past. (Actually, since the universe is expanding, the light we see now is from when the star was 100 million light years away, 100 million years ago -- but at present it would be much farther than that.)

What's not possible is for the light to arrive here any faster than the speed of light, so that we see what's happening now, or more recently than the number of light years between us and that star when the light starts traveling towards us.

Even knowing it was there, it was still somehow shocking to turn that corner and see the flight deck frame and the Challenger fuselage, right there.

That whole building is incredible. The reveal of the Atlantis was a special moment for me, forever.

[removed]

Allan McDonald even warned them of the issues which they promptly ignored...

I have vague memories of our teachers (also South Florida) taking us outside in anticipation of seeing the landing but then taking us in without really explaining why we didn't get to see anything. I remember seeing it on the news later in the day.

How come Columbia always feels like it's totally overshadowed by Challenger even though it's more recent? Or is it because I was 10 when Challenger blew up and in my mid 20s when Columbia went. Did it hit me harder as a child maybe?