Recent comments in /f/space
Adeldor t1_j5s88se wrote
Reply to comment by me_too_999 in NASA to test nuclear thermal rocket engine for the first time in 50 years | CNN by dem676
I'm unaware of any such accident with NERVA NTRs, but very much open to correction. Might you provide a reference?
[deleted] t1_j5s7cv1 wrote
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RhubarbImportant5750 t1_j5s4wu2 wrote
Reply to comment by HIMP_Dahak_172291 in NASA to test nuclear thermal rocket engine for the first time in 50 years | CNN by dem676
One idea would be to use reusable 1st booster rockets like the ones space x uses to reduce the amount of debris left in space.
Correct_Inspection25 t1_j5s4wbg wrote
Reply to comment by me_too_999 in NASA to test nuclear thermal rocket engine for the first time in 50 years | CNN by dem676
Got a reference? I think the early 1960s JSLAMM engine may have been canceled for that but the late 60s early 70s NERVA space test was axed by the Nixon Administration as part of budget cuts and descoping of the Saturn replacement down to just the shuttle/LEO. https://en.m.wikipedia.org/wiki/NERVA
me_too_999 t1_j5s3x9q wrote
Reply to comment by ttkciar in NASA to test nuclear thermal rocket engine for the first time in 50 years | CNN by dem676
They stopped it because of an accident that caused super criticality, a massive radiation release.
Material, and nuclear science wasn't quite up to the task 50 years ago.
Spez, the deaths were a separate incident.
[deleted] t1_j5rzif6 wrote
NullRad t1_j5rzaxz wrote
>In 2002, three decades after Hawking’s result, the physicists Roberto Emparan and Harvey Reall — now at the University of Barcelona and the University of Cambridge, respectively — found a highly symmetrical black hole solution to the Einstein equations in five dimensions (four of space plus one of time). Emparan and Reall called this object a “black ring” — a three-dimensional surface with the general contours of a doughnut.
A hypersphere, or a sphere in 5 dimensions, would render in our frame of reference as a Kerr (ring) black hole.
Unsure about those infinite configurations and their stability in a spacetime frame of reference. Most probably rapidly decay.
[deleted] t1_j5ry19s wrote
Reply to comment by HIMP_Dahak_172291 in NASA to test nuclear thermal rocket engine for the first time in 50 years | CNN by dem676
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FrostyAcanthocephala t1_j5rxlwr wrote
Well, why not just join a religion? I mean, they don't have any rational backing for their ideas, either.
HIMP_Dahak_172291 t1_j5rwsjo wrote
Reply to comment by BabylonDrifter in NASA to test nuclear thermal rocket engine for the first time in 50 years | CNN by dem676
Well we have to get it all up there first and we dont have teleporters.
BabylonDrifter t1_j5rwo0z wrote
Reply to comment by HIMP_Dahak_172291 in NASA to test nuclear thermal rocket engine for the first time in 50 years | CNN by dem676
Please explain how an object on a trajectory that does not intersect with any planet gets caught in a Kessler belt.
[deleted] t1_j5rvgmg wrote
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HIMP_Dahak_172291 t1_j5rsvl5 wrote
Reply to comment by BabylonDrifter in NASA to test nuclear thermal rocket engine for the first time in 50 years | CNN by dem676
Sure. Until they get caught in the Kessler belt we are busy building.
BabylonDrifter t1_j5rspeu wrote
Reply to comment by HIMP_Dahak_172291 in NASA to test nuclear thermal rocket engine for the first time in 50 years | CNN by dem676
Nuclear rockets are only deployed in trajectories that do not intersect with any planet.
HIMP_Dahak_172291 t1_j5rscw1 wrote
Reply to comment by BabylonDrifter in NASA to test nuclear thermal rocket engine for the first time in 50 years | CNN by dem676
Given our track record with junk in orbit it could be a positively glowing future here in a century as it all falls back down.
[deleted] OP t1_j5rqeiv wrote
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[deleted] OP t1_j5rfor2 wrote
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BabylonDrifter t1_j5regnr wrote
Awesome. We've wasted too much time. Nuclear Rocketry is the path to a bright future for all the people of earth.
jlredding_91 t1_j5r6hgi wrote
Reply to Stereoscopic GIF of a NASA simulation of two binary black holes orbiting by EmergeHolographic
Look, man…I really don’t care if these “black” holes are binary, non-binary, or whatever. But to post this kind of video without a NSFW tag is not cool.
Cnoized t1_j5r5wth wrote
Reply to comment by Puffin_fan in About Black Holes Being Round... Maybe Not by JustAPerspective
I think you should look at Swartzschild radius and why the event horizion accually occurs. I believe that there is such a large density of mass in a black hole that most asymetries in the event horizion would be indistiguishable from a perfect sphere.
classicalL t1_j5s94gr wrote
Reply to Rocket Lab launches 3 satellites in first mission from U.S. soil by Robb4848
Looking forward to Neutron launches from nearby.