Varsect
Varsect t1_j6hlvj0 wrote
Reply to comment by Aarakocra in In the absence of cosmic radiation, would an object placed in space eventually cool to absolute zero? by IHatrMakingUsernames
>Yes-ish. The concept of the heat death of the universe is the end result of that idea. The stars cool off and we are left with bodies that slowly cool down until things reach absolute zero and the universe is “dead”.
You can't reach absolute zero. Dark Energy is there, even without Dark Energy, subatomic particles will still be there, also, absolute zero on such scales and definitions would require true nothing to exist and we don't even know if that is possible
>However the radiation will happen at some point, so the body will eventually drop to absolute zero.
That's now how Thermodynamics works, at all.
Varsect t1_j6hkvno wrote
Reply to comment by Lyress in In the absence of cosmic radiation, would an object placed in space eventually cool to absolute zero? by IHatrMakingUsernames
Does entropy decrease?
Varsect t1_j6dn8tr wrote
Depending on the view point from another distant world, the Sun would either be in the constellation Capricornus or if it's from an Alpha Centauri world, Cassiopeia's outcast regions.
Varsect t1_j69d4ga wrote
Reply to Shouldn't goldilocks zones shift over time? by LaRoara42
Yes. It happens all the time. During the Red Giant phase, the Earth will either become a bunch of new thermal energy to add into the system or become the new Mercury and the goldilocks zone will have shifted to somewhere between Saturn and Uranus. It will also be influence by temp too but anyways,it is also predicted that Titan and Europa could hypothetically reach levels tolerant enough to reach Earth's current temp.
Varsect t1_j68j8hk wrote
Reply to comment by Yaver_Mbizi in In the absence of cosmic radiation, would an object placed in space eventually cool to absolute zero? by IHatrMakingUsernames
Nature doesn't really factor in such stuff where entropy decreases (unless you're freezing stuff like crazy) and energy levels go crazy but uh, sure?
Varsect t1_j681lva wrote
Reply to comment by mfb- in In the absence of cosmic radiation, would an object placed in space eventually cool to absolute zero? by IHatrMakingUsernames
Quick question: how did you get that flair?
Varsect t1_j680v5y wrote
Varsect t1_j680kxk wrote
Reply to comment by mfb- in In the absence of cosmic radiation, would an object placed in space eventually cool to absolute zero? by IHatrMakingUsernames
I mean, dark energy isn't entirely necessary to avoid 0 Kelvin at all tbh.
Varsect t1_j680hi6 wrote
Reply to In the absence of cosmic radiation, would an object placed in space eventually cool to absolute zero? by IHatrMakingUsernames
By the laws of physics nothing can approach (reach) 0 Kelvin because by that point,all thermal exchanges stop AKA atoms stop moving entirely (that's not the most accurate way to say it but for simplicity's sake) Our current understanding of Dynamics and Statistical Physics cannot allow for such things to exist in our universe. Nevermind anything below that.That is why it is absolute in temperature, so really, there is no necessary single fixed mechanism except for thermal exchange that can stop 0 Kelvin from being reached. Also, the uncertainty principle would be screwed.
Varsect t1_j67ju1h wrote
Reply to comment by AurumArgenteus in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
I personally think the simulation idea isn't true. But hey, maybe.
Varsect t1_j67hgps wrote
Reply to comment by AurumArgenteus in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
Whether you're trying to argue with the OP or yourself is the real question to ask.
Varsect t1_j67cstx wrote
Reply to comment by AurumArgenteus in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
>Assuming it can communicate
You can't assume what is impossible.
Varsect t1_j65jp7n wrote
Reply to comment by ChrisARippel in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
Oh, but then you'd need a lot of observations in a lot of observable universes to truly confirm isotropy in our universe.Also, the Milky Way image would most likely be redshifted into oblivion, and that's not even talking resolution, but thanks for this answer.
Varsect t1_j6570x0 wrote
Reply to comment by ChrisARippel in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen
Why tho. It would literally take information to travel 46 billion years. Pretty sure quadrillions of generations could live in that timescale.
Varsect t1_j64qg42 wrote
Reply to comment by LincolnsVengeance in Sending a signal faster than light is time travel? by KingOfTNT10
Yeah. The fantasy of leaving the local group is basically not realistic and by the time we do learn to do so most of the observable universe will be concentrated almost solely on the edges of the Virgo cluster around Laniakea.
Varsect t1_j64ox1f wrote
Reply to comment by LincolnsVengeance in Sending a signal faster than light is time travel? by KingOfTNT10
I mean like, that's localized to the Milky Way and the local group. For extra local group travel, it'd basically be impossible.
Varsect t1_j64njgc wrote
Reply to comment by LincolnsVengeance in Sending a signal faster than light is time travel? by KingOfTNT10
Ok, you've won
>The hypothesis exists therefore there are scientists who at least believe in the possibility that FTL travel is possible
I've always wondered how FTL would help outside of the local group with an expanding universe.
Varsect t1_j64kxi2 wrote
Reply to comment by LincolnsVengeance in Sending a signal faster than light is time travel? by KingOfTNT10
What about the Alcubierre Warp Drive?
Varsect t1_j64j95p wrote
Reply to comment by LincolnsVengeance in Sending a signal faster than light is time travel? by KingOfTNT10
>That's completely not true.
It's not true nor false. You can't conclude one until practical tests have been made.
Varsect t1_j64j22l wrote
Reply to comment by Robjchapm in Sending a signal faster than light is time travel? by KingOfTNT10
Yeah. We can even make blue rats!
Varsect t1_j62t8xf wrote
Reply to comment by grishno in Earth's inner core may be slowing down, but “Nothing cataclysmic is happening,” says Hrvoje Tkalcic, a geophysicist at Australian National University. “The inner core is now more in sync with the rest of the planet than a decade ago when it was spinning a bit faster.” by clayt6
Why should you?
Varsect t1_j5zlf7o wrote
You need to have a good grasp of the maths and physics behind astronomy before rushing in. So assuming, you know the 2 very well, A Brief History of Time and Astrophysics for people in a hurry are two very good options.
Varsect t1_j5y9z1g wrote
Reply to What educational books about space should be read for a general idea of it? by happy__teo
‘A brief history of time’ and ‘Astrophysics for people in a hurry’ are a good starter pack.
Varsect t1_j6iuweq wrote
Reply to comment by HarryHacker42 in eli5: How do erections work? Do they sometimes happen unintentionally? by [deleted]
That's not intentional.