Recent comments in /f/space

towkneeman777 t1_jaeajk8 wrote

I guess I'm seeing myself outside our known or perceived universe and seeing it as like my hand covering the moon. Seeing it all in a glance.. it's all one time and space as I see it... It's about how it's perceived to the observer..

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Nerull t1_jaea6ue wrote

Vertically launching rockets try to get out of the dense atmosphere as quickly as possible, so an air breathing engine wouldn't work for very long - Falcon 9 is above 30000 ft about 1 minute after launch, and above 50000 ft 20 seconds later. The added cost and complexity of another stage for such a short period of the flight aren't really worth it.

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volcanopele t1_jae9180 wrote

Except every time you come back into the hab there is the brown soot that you can't get off your boots so it gets tracked everywhere...

But seriously, about the water ice. Yes it is easily available on the surface, certainly more so than say the Moon, but in many places it is buried underneath a lag deposit of [insert non-ice component name here]. So the easiest exposures are on steep slopes.

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theexile14 t1_jae7zee wrote

I have worked in space debris tracking before. I'm not forgetting anything. Low LEO clears in a relatively short period of time, it is not at serious risk. High LEO...I mentioned? You seem to be freaked out that I didn't mention a specific term that's become overly common amongst those who don't understand the environment.

The most serious risks to High LEO are what I mentioned: ASATs and breakups of non-operating satellites. If those continue to happen unabated for some time then we can start to worry about Kessler Syndrome. Too many people watched Gravity and took it as a real risk.

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failurebeatssuccess t1_jae6l0n wrote

Well it looks pretty uniform from what we can see (and we can see a lot of it - the observable universe is huge). There is no good reason to assume there is anything particularly atypical about 'our bit' of the universe and the unobservable universe would be any different).

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Tjam3s t1_jae6gkd wrote

I suppose the part they seem to assume is that the black hole is the cause for dark energy, but without actual study into the real cause for the correlation.

It might be the other way around with the expansion of the universe causing the growth, or it may be an indirect mechanism being the cause for both of them.

The assumption that the black hole is helping cause the expansion is what I was digging at.

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