Definitely interesting, but unfortunately I doubt we will ever get the point of turning mars into a habitable planet. If anything, I think we will just make habitable shelters.

Thanks for the explanation!

I think we could harvest it yes but there's some issues :
- when approching the sun the ice would sublimate well before arriving close to earth orbit

- it would cost so much money than even for the rarest elements found on earth it's still cheaper to look for them here

An Earth-like atmosphere would need to mass 27 tons per square meter on Mars vs 10 tons on Earth, due to the lower Martian gravity. That would be 3900 trillion tons total. Current loss rate is 95,000 tons a year. If the loss rate increased a thousand times to about 100 million tons/year. that still gives a half life of 20 million years, which is long by human standards.

There are several ways to reduce the losses. One is to put a magnetic shield "upwind" of the solar wind, and deflect it off the planet. That's effectively what Earth's magnetic field does.

Another is to dome the planet. Surface pressure depends on the weight of what is above the surface. It doesn't matter what that weight is made of. 27 tons is a lot per square meter. It would be more than 10 meters of glass thickness. So you can build a greenhouse the size of a planet and keep the atmosphere from leaking out.

Just because the top of an atmosphere being exposed to space is natural doesn't mean it is required. You can have several km of air below the dome to get an outdoor feeling, and leave the taller mountains sticking out into space if you want.

Honestly saddens me that space doesn't look like this for us.

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Lori Garver was in the middle of space training to take the mission in the early 2000s but the Russians were trying to raise as much money as they could to fund the flight. Bass and Garver both completed training in Russia and were medically cleared to go.

Kicked off because would could not pay the price to board the rocket.

Of course, but when all the H2 in all of the gas giants has been mined and fused, there will be ~500x more waiting in the sun.

Yeah, I guess I'm a bit spoiled; my sky is reasonably dark. I'm in a fairly sparsely populated area a bit north of Toronto.

I can see stars but to get away from cities I kinda need a car. Thanks for the link btw!

https://en.m.wikipedia.org/wiki/Dark-sky_preserve

That is a link to a list of all of the Dark sky preserves worldwide.

Your age doesnt have to be a limiting factor. Sit down with your dad and pull up this list and see if you guys can plan to visit one. They are all over the world it may just be a few hour drive.

I didn't see the stars with my eyes until I was 29. It is an extremely moving experience. Good luck!

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M31 at the same distance from Cassiopeia as Cassiopeia from Polaris. And, conveniently, it is a straight line.

https://www.lightpollutionmap.info/

I can't really, I'm 13 but my dad might want to aswell.

Try a dark sky preserve. Almost sure you could from one of those areas.

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~130 decibels, so basically as loud as a gunshot at 1.5km. I’m assuming this is a continuous thing that gradually decreases as it gets further away. I knew they were loud but that’s more than I expected.

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Hello u/Far-Counter-1319, your submission "I can’t remember what it’s called" has been removed from r/space because:

• Such questions should be asked in the "All space questions" thread stickied at the top of the sub.

Please read the rules in the sidebar and check r/space for duplicate submissions before posting. If you have any questions about this removal please message the r/space moderators. Thank you.

Protip: Grab an app like StarTracker. It makes it a lot easier to locate specific things in the night sky, and helps you find out what the thing you're looking at actually is

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I live in the middle of a busy nightlife area of a city (ASU in Tempe, AZ) and on clear nights can make Pleiades out fairly well. I also have to have it just off the center of my vision, but counting it isnt too difficult. Also, I'm surprised to see my favorite constellation talked about, since I rarely hear about it

I understand what you are referring to - one of the proposed mechanisms that prevents time paradoxes in hypothetical time travel scenarios.

The only phrase I can think of is temporal censorship, although I'm not sure if this is the coreect philosophical phrase for the suggested mechanism.

Well, Stephen Hawking proposed a Chronology Protection Conjecture. In it he speculated that nature would prevent time travel. Does not align with your statement that an action in the past is fixed in the present by the universe, but it is the closest to nature (or a natural process) preventing you from messing with the past.

Here is a link: https://en.m.wikipedia.org/wiki/Chronology_protection_conjecture