Recent comments in /f/space

TiggerTheMad t1_jaa1nfk wrote

Reply to comment by aramil2001 in Who pays for space debris removal? by DevilsRefugee

What radiation? Are you thinking RTGs? I don't think they are typically used in things that are going to eventually de-orbit, it seems like a really bad idea. Unless you are orbiting some uranium enrichment plants, there isn't going to be radiation to remove.

Bombarded by cosmic rays != radioactive

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jeffh4 t1_jaa1hyk wrote

Reply to comment by MoreGull in The Case for Callisto by MoreGull

As long as we don't have the stupid premise of Garden of Rama, then I'm fine.

What was that, you ask? A selection committee was created to select only the finest of the finest 2000 of Earth scientific minds to take the return journey to the Rama Node. However, they can't get that many so they fill in the extras with ... convicts. Not only convicts but convicts with life sentences. The story then proceeds to not bother to mention the few scientific minds chosen to go on the mission.

Number one in my "all time disappointment sequel" list. Number two is the sequel.

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Decronym t1_jaa19al wrote

Reply to My two year progress shooting Jupiter, using the same $300 telescope! by theillini19

Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:

|Fewer Letters|More Letters| |-------|---------|---| |HLV|Heavy Lift Launch Vehicle (20-50 tons to LEO)| |LEO|Low Earth Orbit (180-2000km)| | |Law Enforcement Officer (most often mentioned during transport operations)| |LIGO|Laser Interferometer Gravitational-wave Observatory|

^(2 acronyms in this thread; )^(the most compressed thread commented on today)^( has 16 acronyms.)
^([Thread #8627 for this sub, first seen 27th Feb 2023, 22:57]) ^[FAQ] ^([Full list]) ^[Contact] ^([Source code])

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lorfeir t1_jaa0aqp wrote

Reply to comment by phatprize in Regarding buying a telescope by Smitrang

Those are probably fine (I've never used those particular ones). Looks like they may have a tripod adapter built in. If so, that's pretty good, as those might be a little difficult to hold steady.

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jeffh4 t1_jaa05n3 wrote

Reply to comment by 3SquirrelsinaCoat in The Case for Callisto by MoreGull

Beside economics, the other overriding reasons in science fiction for establishing a space colony are fundamentalist regimes and fundamentalist religious groups.

Actually, add "extremely rich" to the beginning and "who whole-heartedly embrace technology" after then end of the two groups named above. We're unlikely to ever see the an Amish barn raising on Callisto. :-)

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jazzwhiz t1_jaa01tf wrote

Reply to comment by Other-Weakness-9177 in My two year progress shooting Jupiter, using the same $300 telescope! by theillini19

We can detect gravitational waves at a few points on the Earth. From this they can estimate the direction it came from by using timing and other information. The most sensitive experiment is called LIGO and is composed of two separate detectors, one in Washington state and one in Louisiana. The one in Louisiana is better than the one in Washington. There is also another experiment called VIRGO in Italy that is less sensitive but provides a third point to try to identify the direction of the gravitational wave burst event. See for example this plot which shows the region on the sky one real event is likely to have come from based on information from different sources. The green dashed region (HL) is what can be determined from the two LIGO detectors (Hanford and Livingston). The green solid region (HLV) is with VIRGO added in. The orange region is the directional information from a totally different experiment: the Fermi telescope in orbit around the Earth which measures gamma rays (photons). The gamma ray and gravitational wave signal happened at the same time and basically from the same direction so we're extremely confident that they are due to the same underlying physics.

The plot comes from here which has some code for playing around with these sorts of things. The paper for the plot is here.

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ctiger12 t1_ja9yqxp wrote

Reply to Who pays for space debris removal? by DevilsRefugee

I believe the materials they used are worth something, it’s like space mining but in small scale, but consider the close proximity, also much cheaper than go beyond moon and mine some asteroids far far away.

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