Recent comments in /f/space
anon-eh-maus t1_jdx15hk wrote
Reply to comment by ifeelmy in Space Force should prepare for the threat we have — not the one we prefer | TheHill by Corbulo2526
Launching meteors at earth is the biggest threat
TransporterError t1_jdx10le wrote
Reply to James Webb Space Telescope finds no atmosphere on Earth-like TRAPPIST-1 exoplanet by locus_towers
Of course, there's no atmosphere (any longer)!
The aliens already utilized its precious gaseous elements for the construction of their righteous Dyson swarm.
sight19 t1_jdx0z40 wrote
Reply to comment by arcanum7123 in Black holes may be swallowing invisible matter that slows the movement of stars by trevor25
For structure to form, you need to compress gas in a small volume. As gas is compressed, it's temperature increases and so do the random motions of the theoreticized WIMPs. That means that at a certain point, the gas cloud stops collapsing (this is also called 'virialization'). The only way to collapse further is if the gas cloud would leak out temperature somehow, and that can only happen via radiation. And dark matter can't radiate, so it can't cool further
HeebieMcJeeberson t1_jdx0byy wrote
Reply to comment by ventus1b in If earth was a smooth sphere, which direction would water flow when placed on the surface? by Axial-Precession
For one thing, perfect smoothness doesn't eliminate friction - there's also electrostatic attraction between molecules. Eventually the planet rotating under the water would coax it to move.
But moreover, the atmosphere would be screaming by overhead since it does rotate with the Earth. The atmosphere is chaotic, with zones of different pressures which press down on bodies of water unevenly, creating irregularities that the sideways wind can act on to create waves. This is how wind stirs up waves on calm, smooth lakes and such.
karlou1984 t1_jdx07ok wrote
Reply to comment by AlphaDrac in James Webb Space Telescope finds no atmosphere on Earth-like TRAPPIST-1 exoplanet by locus_towers
Shouldn't be that long hopefully. I thought the orbital time is like 21 days max for these planets, some a lot shorter.
StrangeTangerine1525 t1_jdwzw75 wrote
Reply to comment by mmomtchev in James Webb Space Telescope finds no atmosphere on Earth-like TRAPPIST-1 exoplanet by locus_towers
Yes but planets can lose gas to space via thermal escape, at very high rates depending on the temperature. There is also photochemical reactions caused by UV rays that can also drive atmospheric escape, so this planet could have a strong magnetic field and still have no atmosphere, especially if it is this close to its host star, a relatively active red dwarf at that.
Rhoihessewoi t1_jdwzhth wrote
Reply to comment by AGARAN24 in Discussion on Time relativity near black holes by AGARAN24
If you want to see the end of the world and don't wanna wait, just fly over the event horizon.
But don't blink, or you will miss it. The "rest of time" will be compressed into a short, intense gamma ray burst.
mytauntmissed t1_jdwy1xp wrote
Reply to comment by Half-Borg in Are we getting wider? by 3yoshikageKira3
Ask yes thinking about it the constant I'm thinking of was specifically for gravity between two masses g(mm/r²)? Idk it's been a long time lol
[deleted] t1_jdwxlmg wrote
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LunaticBZ t1_jdwxewk wrote
A Dyson swarm, what the Dyson sphere original concept was.
Has none of these downsides. You get usable living space and energy production with each habitat, power satellite you build and you build it as much as you want/ have resources for.
taladrovw t1_jdwx42n wrote
Reply to comment by pr1ncezzBea in The image was created by shots photographer Jon Carmichael took while flying at 39,000 feet on a Southwest flight from Portland, Oregon, to St. Louis. Credit: Jon Carmichael by Davicho77
Ooh yeah it sure helped me put things into perspective. I guess us citizens are ashamed of the system so they downvoted you
ForceUser128 t1_jdwwzrh wrote
Nothing a few lava lamps, some mood music and a fire pit can't fix.
lezboyd t1_jdwwja8 wrote
Reply to comment by AnotherDreamer1024 in Would building a Dyson sphere be worth it? We ran the numbers. by cad908
Honestly, didn't read the article, it was a bit too long, but to further your argument, a Dyson sphere doesn't have to be a solid sphere encapsulating the star. One can theoretically put a swarm/lattice of 'dyson satellites' in orbit around the sun to achieve the same effect. What holds back the concept of a Dyson sphere as a valid energy source is not our satellite building tech or mining abilities, but that we don't yet know how to transmit this energy that's generated in Space onto Earth without frying it.
Half-Borg t1_jdwwgp3 wrote
Reply to comment by mytauntmissed in Are we getting wider? by 3yoshikageKira3
- Expansion is not constant. It has changed a lot between the big bang and now.
- Expansion depends on the amount of space there is, more space equals more expansion
- This is called the big rip. I'm not certain what the current state of research is regarding that. But it won't happen for many billions of years.
3SquirrelsinaCoat t1_jdwvyaj wrote
Reply to comment by nmfpriv in James Webb Space Telescope finds no atmosphere on Earth-like TRAPPIST-1 exoplanet by locus_towers
TRAPPIST system is a significant point of study - there are loads of brilliant people waiting for this data. Stay tuned. 1b is just a little something to wet your whistle.
wegqg t1_jdwv7b8 wrote
Reply to comment by dingo1018 in IVO Quantum drive to test all-electric thruster on controversial basis of "Quantized Inertia" by J_K_
I can see you're a real smart guy.
Could I interest you in my perpetual motion machine that is guaranteed to make you a bazillionairre (this is a very large new number that hasn't been discovered yet).
EarthSolar t1_jdwuwab wrote
Reply to comment by PhoenixReborn in [NASAWebb] TRAPPIST-1 b: We give it a one (M-dwarf) star review; it lacks atmosphere. Webb found the dayside temperature of this rocky exoplanet to be about 450º F (227º C) — suggesting it has no significant atmosphere by Easy_Money_
The idea of high altitude haze is for the haze to be in a zone where the atmospheric pressure is too low to effectively transport heat from dayside to nightside, and thus causing it to look like airless planet. That said the haze itself might move and jeopardize this, but I figured it's better to ask.
lezboyd t1_jdwu0j2 wrote
Reply to comment by mmomtchev in James Webb Space Telescope finds no atmosphere on Earth-like TRAPPIST-1 exoplanet by locus_towers
Plus, Venus is technically in the Sun's Goldilocks Zone. If it weren't for the runaway greenhouse effect, it might as well have been habitable. There are some models that do hint that Venus had water oceans like Earth for a few million years before its atmosphere took a turn.
simcoder t1_jdwte57 wrote
Reply to comment by ifeelmy in Space Force should prepare for the threat we have — not the one we prefer | TheHill by Corbulo2526
You can deny the orbitals for a fraction of the cost of controlling them.
You're better off trying to figure out how to share :(
PhoenixReborn t1_jdwsr9l wrote
Reply to comment by EarthSolar in [NASAWebb] TRAPPIST-1 b: We give it a one (M-dwarf) star review; it lacks atmosphere. Webb found the dayside temperature of this rocky exoplanet to be about 450º F (227º C) — suggesting it has no significant atmosphere by Easy_Money_
Would that be consistent with the thermal measurements? Sounds like there isn't as much heat exchange between the day and night sides of the planet as there would be with an atmosphere.
ifeelmy t1_jdws0ak wrote
Reply to Space Force should prepare for the threat we have — not the one we prefer | TheHill by Corbulo2526
He who controls the orbitals, controls the world.
seanflyon t1_jdwrme1 wrote
Reply to comment by rocketsocks in Rocket Lab targets $50 million launch price for Neutron rocket to challenge SpaceX’s Falcon 9 by cnbc_official
Are you calling the DC-X a suborbital rocket? That seems like a stretch, it never made it to space or close. DC-XA got 3140 meters up. That is about a quarter as high as a normal commercial aircraft flights.
phunkydroid t1_jdwqiy0 wrote
Reply to comment by peeweekid in This is what 7 minutes of exposure time looks like on a dark, moonless night at Zabriskie Point, Death Valley (USA)! by peeweekid
Most of it is not, the milky way isn't millions of light years across.
Corbulo2526 OP t1_jdwq626 wrote
Reply to comment by [deleted] in Space Force should prepare for the threat we have — not the one we prefer | TheHill by Corbulo2526
Balloons are well in atmosphere and not even close to space. More of an Air Force problem than a Space Force problem.
LunaticBZ t1_jdx1lod wrote
Reply to comment by lezboyd in Would building a Dyson sphere be worth it? We ran the numbers. by cad908
Oh simple solution to not frying Earth with the energy.
Don't send it to Earth.
Most our industry and population will be living off world anyways.