Recent comments in /f/space
HouseOfZenith t1_j2bsewm wrote
Reply to comment by wokeupatapicnic in What is our current "best guess" about how to observers that entered a black hole on opposite sides would look to each other once they crossed the event horizon? by WittyUnwittingly
That would be scary. When we develop space travel we should throw people in them.
stewartm0205 t1_j2bs81v wrote
Reply to comment by Reddit-runner in What if we kept pursuing nuclear spacecraft propulsion? by rosTopicEchoChamber
In space, a NTR wouldn’t need much shielding. In space, a tank wouldn’t need much insulation.
Yippeethemagician t1_j2bs4n0 wrote
Reply to comment by dittybopper_05H in Just back from witnessing a test firing of a rocket motor that my neighbor built by goatharper
In absolutely limited applications. Just making them to make power for residential consumption? It's a bad idea. The waste is out there, and it's real.
wokeupatapicnic t1_j2brwdu wrote
Reply to comment by Xethinus in What is our current "best guess" about how to observers that entered a black hole on opposite sides would look to each other once they crossed the event horizon? by WittyUnwittingly
Pretty sure you just described the Firewall theory. I think Hawking proved that or at least was able to suggest that, this is not the case, but it’s worth looking into on your own if you’re interested!
Yippeethemagician t1_j2brv7a wrote
Reply to comment by how_tall_is_imhotep in Just back from witnessing a test firing of a rocket motor that my neighbor built by goatharper
Yes it is. Because alot of people incorrectly believe that there is something magical about nuclear power. It just boils water. That waste stays for a long time, in the thousands of years. They aren't able to deal with it now, and I don't see anyone being able to deal with it later. Hangout at a nuke plant sometime. Be amazed and horrified with how much the Simpsons got right.
stewartm0205 t1_j2brri2 wrote
A tug would have been a dumb idea. Thrust would have been sufficient for a rocket leaving orbit. A factor of 2 or 3 in ISP makes a big difference if you are going interplanetary.
Thedracus t1_j2brdgw wrote
Reply to comment by FormulaNewt in Could we find a Pandora-like planet in real life? by lemonny3663
I've never heard an ad on Pandora. You just have to subscribe. Then you can listen to anything online or offline
wokeupatapicnic t1_j2br80d wrote
Reply to comment by Nerdcoreh in What is our current "best guess" about how to observers that entered a black hole on opposite sides would look to each other once they crossed the event horizon? by WittyUnwittingly
Mostly correct. You’d see the universe progressively move fast and faster towards infinite motion until the “light-death” of the universe. Again, that is provided you were able to perceive and maintain thought during the process. But yes, you would not feel like you were moving in slowmo or anything, but everything outside of the BH would begin happening faster and faster and faster as you blinked out of existence
[deleted] t1_j2br4ud wrote
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[deleted] t1_j2br4rh wrote
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incarnuim t1_j2bqwv2 wrote
Reply to comment by Impossible_Pop620 in Black hole question by Impossible_Pop620
The probe wouldn't notice a significant change. In fact it would be really tough for the probe to pinpoint when or even IF it had actually crossed the EH.
But you wouldn't get the probe back, you wouldn't get any signals, and you wouldn't feel any significant change in forces. The probe would just be gone (from your PoV). Meanwhile the probe would think it was still attached and sending back data, but the data never gets there....
[deleted] t1_j2bqldf wrote
Reply to comment by [deleted] in SpaceX caps 2022 with record-setting 61st Falcon 9 launch by Master-Strawberry-26
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Hippo_Steak_Enjoyer t1_j2bqi2r wrote
Reply to comment by ghostyghostghostt in I don’t believe in the black hole. by Rabbitlooker
Here you go bud
https://www.google.com/search?q=how+is+gravity+produced&ie=UTF-8&oe=UTF-8&hl=en-us&client=safari
Took a 3 second search you dimwit.
capmap t1_j2bqex5 wrote
Reply to comment by kimthealan101 in What is our current "best guess" about how to observers that entered a black hole on opposite sides would look to each other once they crossed the event horizon? by WittyUnwittingly
No. That's only from an outsiders' perspective.
FormulaNewt t1_j2bqavq wrote
You mean one where it plays the same songs over and over and if you try to skip one you have to listen to a bunch of ads?
jaydfox t1_j2bqat6 wrote
Reply to comment by graveybrains in What is our current "best guess" about how to observers that entered a black hole on opposite sides would look to each other once they crossed the event horizon? by WittyUnwittingly
Haha, no, but I do watch a fair amount or space channels (PBS Space Time, Dr. Becky, Anton Petrov, etc.).
One thing worth mentioning is that you'll eventually be spaghettified, no matter how big the black hole is. If a stellar mass black hole has an event horizon of about 3 km (I think, not positive), then a 1 million stellar mass black hole would have an event horizon of about 3 million km. But only when you get within 300 km of the singularity, would the tidal forces be as strong as at the event horizon of the stellar mass black hole. For the largest known black hole (66 billion solar masses, off the top of my head, but maybe there's a bigger one), the event horizon would be about 200 billion km in radius, about 2% of a light-year (so 0.04 light-years in diameter). But the tidal forces wouldn't be as strong as at the event horizon of a stellar mass black hole, until you were about 12,000 km from the singularity. This is due to the rapid decay of tidal forces with distance.
So in that sense, the person you were replying to was right. You will be spaghettified before you get anywhere near the hypothetical singularity, no matter how big. But with a big enough black hole, you'd get pretty deep into the black hole before you get ripped apart. Long enough to make interesting observations. Which is what the OP was asking about. What would you see if you fell into a large enough black hole? Long after you've crossed the event horizon, and long before you get close enough to the singularity to be ripped apart by tidal forces. I assume you would see stuff that fell in right after you, and stuff that fell in right before you. (If not, that implies you wouldn't even see your feet after they went in, if you went in feet first. And I seem to recall several different authors saying you would hardly notice yourself pass through the event horizon.) How much longer before and after? I assume the cosmic background radiation behind / above you would be blue shifted from microwave into infrared, visible, eventually ultraviolet, xrays, etc. Whether you get ripped apart before witnessing that, I don't know. I'd like to know.
capmap t1_j2bq8ln wrote
Reply to What is our current "best guess" about how to observers that entered a black hole on opposite sides would look to each other once they crossed the event horizon? by WittyUnwittingly
For a black hole of sufficient size such as a SMBH, GR states there's a gentle fall (at light speed, lol) until the inner event horizon. QM states you're destroyed at the event horizon by a firewall of radiation.
I'm not going to profer which one is accurate and then go on a riff on that one theory when any matter have already been vaporized.
universallybanned t1_j2bpu2k wrote
Reply to comment by petersrin in I don’t believe in the black hole. by Rabbitlooker
And to continue, "my gut says black holes aren't real" doesn't mean you do or do not "believe" in science
[deleted] t1_j2bps9l wrote
Reply to comment by blackenswans in South Korea's test flight of solid-propellant space launch vehicle successful - ministry by Soupjoe5
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[deleted] t1_j2bpoz1 wrote
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imzelda t1_j2bpesv wrote
Imagine you’re in North Korea and see this. I would be stunned.
predict_irrational t1_j2bp4hm wrote
Reply to comment by Hippo_Steak_Enjoyer in I don’t believe in the black hole. by Rabbitlooker
You don't even know that scientist don't know where gravity comes from haha
monfuckingtana420 t1_j2bock4 wrote
Reply to Just back from witnessing a test firing of a rocket motor that my neighbor built by goatharper
How many times has your neighbor watched October Sky?
UmbralRaptor t1_j2bsqdb wrote
Reply to Question by Psychological_Wheel2
Water (in the form of ice) is quite common in the outer solar system. Water shortages in the present/near future are more about clean water.