Recent comments in /f/space

Bensemus t1_j9rads6 wrote

The other one where ~2k dishes experience a temporary outage was due to a billing issue between Ukraine, the UK, and SpaceX. That issue was quickly resolved and those dishes were active again. That was 2k out of about 25k.

Or the issue where during an offence Ukraine lost comms through Starlink. that was due to them outrunning it. SpaceX is only activating Starlink in areas Ukraine is operating in. Makes sense SpaceX wouldn't have access to classified military operations so they were slower to act than Ukraine was advancing. That was also quickly fixed as SpaceX activated more cells.

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Melodicmarc t1_j9r7hs7 wrote

I don't think that makes sense. Ripples expand from a single point outward, much like an explosion with a burst of energy. The big Bang wasn't necessarily that. My favorite metaphor for the universe expanding is it is like a loaf of raisin bread in the oven. Imagine you are one of the raisins. As the bread rises and expands, every raisin gets further from each other. So rather than the universe expanding outward from a central point (like an explosion) and us riding a ripple along that explosion, what really is happening is everything is expanding away from everything else. Every galaxy is slowing getting further and further from us. And if you were to go to another galaxy, then every galaxy would still be slowing expanding further and further from us. The space between everything is what is really expanding.

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Anonymous-USA t1_j9r1nrp wrote

The universe may well be infinite, but the Big Bang was the creation of our universe, not just the expansion of mass and energy into a preexisting space-time. The Cosmic Microwave Background radiation are the “ripples” you speak of, btw. If LIGO can be made with greater sensitivity, a goal of the project, it may well also measure those gravitational “ripples”.

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nsfwtttt t1_j9qzp9o wrote

It’s funny that there’s a concept on earth “finite”, and it’s the default for us and we can’t compare infinity… which kinda natural if you think of it, and the default for the universe or whatever is “beyond” it, incomprehensible in size

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dromni t1_j9qvksb wrote

Someone already posted the multiverse taxonomy and there are lots of alternative Big Bang models floating around trying to explain weird observations that have accumulated over the years (possible asymmetries of the cosmic microwave background, vast cosmological voids, old objects in the early universe, "Dark Flow", etc), and some of them postulate that what we call "the universe" is a sort of sprout from an older, larger universe. Conversely, our own universe may be sprouting. In those models the weird observations are explained either by the "history" of the universe as a sprout or by new sprouts in our own universe.

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Doomenate t1_j9qspcn wrote

It's funny your mention SLS. The payload is 231,485 lbs, but the liquid fuel is hydrogen and oxygen which combined after combusting would become 2,177,000 lbs of water. So we'd be splitting 2 million pounds of water into hydrogen and oxygen just to combine it again to move 200k pounds of water into LEO.

Might as well skip the launch and keep the fuel separated!

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-imhe- t1_j9qshhy wrote

Reply to comment by Bryllant in Space Ripples????? by KeyahnDP9

Not necessarily true. Gravitational waves are waves that travel through "empty" space. Very very recently they were the things of science fiction, so it is conceivable that the big bang and the resulting expansion, upon further observation, might indeed share properties with waves as we understand them.

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