Posted on 11/27/2022 10:48:52 PM PST by SunkenCiv
Hosted by: Hank Green
Earth's other moons | SciShow Space
104,369 views | November 22, 2022
(Excerpt) Read more at youtube.com ...
Some related small keywords, sorted, duplicates out:
Bmk.
.
That makes no sense. Joke?
You never saw Star Wars episode VI?
Episode III, rather. That chronological order thing is confusing.
Transcript 0:00 foreign 0:03 the vastness of space might make the 0:05 earth look a little lonely in its 0:07 Journey around the Sun but our planet is 0:09 far from alone it has us for better or 0:11 worse and the thousands of human-made 0:14 satellites we've thrown up into orbit 0:15 and it's had one constant companion 0:18 these past four and a half billion years 0:20 the moon but it turns out that the moon 0:23 might not be the Earth's only Moon it 0:26 all depends on your point of view first 0:28 we should set up some terminology moon 0:30 is a weird word with a fuzzy definition 0:33 the international astronomical Union or 0:35 iau are the Arbiters of naming things 0:37 that are up there you might know them as 0:39 the ones who kicked Pluto out of the 0:40 planet Club back in 2006 and according 0:43 to the iau there is only one Moon around 0:46 the earth that's the big bright gray 0:48 thing in the sky that we are all 0:49 familiar with and its name is spelled 0:51 with a capital M the moon any other 0:54 solid object that orbits a planet dwarf 0:56 planet or any other rock that orbits the 0:58 Sun is called technically a natural 1:00 satellite so the moons that Galileo 1:03 discover covered around Jupiter in the 1:04 early 1600s and the dinky potato-shaped 1:07 moons in orbit around Mars and all of 1:09 the other moons in the solar system that 1:10 aren't the Earth's traveling but he 1:12 technically not moons at least according 1:15 to the iau they do however accept that 1:17 most people call those things moons 1:19 anyway just with a lowercase M so feel 1:22 free to debate with your friends if the 1:24 following satellites are some of Earth's 1:27 other moons anywhere the earth goes in 1:29 its orbit it is by far the most massive 1:32 object so it tends to dominate the scene 1:34 gravitationally speaking that means 1:36 either pulling smaller space rocks into 1:39 itself ending up in a fiery death or 1:41 into orbit around itself sometimes that 1:44 orbits just literally a single loop 1:46 around before the rock escapes back out 1:48 into the solar system sometimes it 1:50 sticks around for a few more Loops that 1:52 only happens for rocks that get close 1:54 enough to the Earth close enough that 1:56 the Earth's gravity becomes more 1:57 important than the gravity of other 1:59 bodies in the solar system mostly the 2:01 sun astronomers call that region of 2:03 space the hill sphere technically every 2:06 object in the solar system has one but 2:08 the more massive the object the larger 2:10 the hill sphere the Earth is about three 2:12 million kilometers across about four 2:14 times larger than the distance between 2:15 the Earth and the capital am a moon so 2:18 if there's something small hanging in an 2:20 object's Hill sphere even if it's just 2:22 one orbit you can think of it as a 2:24 lowercase M Moon while it is there in 2:27 fact there is an unofficial term for 2:29 these temporary satellites many moons 2:31 and astronomers can use the size of 2:33 Earth's Hill sphere and the abundance of 2:36 space rocks in the neighborhood to 2:37 calculate how often our planet can 2:39 capture a Mini Moon back in 2012 one 2:42 international team crunched the numbers 2:43 and found that in an average year one 2:46 new natural satellite about a meter 2:48 across will come join us on average it 2:51 will stick around for nine months before 2:53 spiraling down to earth and burning up 2:55 in the atmosphere or getting flung 2:57 further afield the latest one was 2:58 observed back in 2020 we even covered 3:00 its Discovery in a previous episode 3:02 given their short lifespan fans these 3:04 mini moons might not seem as moon-like 3:05 as quasi-satellites quasi-satellites are 3:08 space rocks that stay floating beyond 3:09 the Earth's Hill sphere but their orbits 3:11 around the Sun always keep them close 3:13 enough to Earth that from our 3:15 perspective down here they appear to 3:17 hang out like our capital and moon does 3:19 astronomers have found five of these 3:21 quasi-satellites so far each measures 3:23 roughly a few hundred meters across the 3:25 most recent one discovered back in 2016 3:27 is called komoa Leva simulations of its 3:30 orbit suggest it's been around for at 3:32 least a century and will stick around 3:34 for even longer sure that pales in 3:36 comparison to the capital M moons four 3:38 and a half billion years but it's a lot 3:40 longer than the many moons we've talked 3:42 about so far and in 2021 one team 3:44 proposed that kamoa Leva might have come 3:46 from the Moon itself after a collision 3:49 chipped it off now if you don't think 3:50 any of these are moons because they're 3:52 too small you're gonna love our final 3:54 example A mysterious cloud of dust that 3:57 might share the moon's orbit or a 3:59 special place in the moon's orbit when 4:01 you have two orbiting bodies like the 4:03 sun in the Earth or the Earth and the 4:05 moon there are a few locations where 4:06 their gravitational influences kind of 4:08 cancel out these are called LaGrange 4:10 points and two of them called L4 and L5 4:13 are located off to the side of the 4:15 smaller body it is these points that 4:17 intrigued a Polish astronomer named 4:18 casimir's cordelewski back in the 1960s 4:21 he published a paper claiming that he 4:23 saw bright spots at the Earth Moon L5 4:26 Point indicating that some kind of dust 4:29 was hanging out there unfortunately for 4:30 him nobody took that claim very 4:32 seriously most astronomers thought that 4:34 anything that tried to settle down in 4:36 one of these two points would quickly 4:37 get ejected by collisions with energetic 4:40 particles streaming through space or by 4:42 the Sun's gravity but in 2018 a team of 4:45 Hungarian astronomers came to a 4:46 different conclusion they modeled the 4:48 four body Earth Moon Sun and Cloud Moon 4:51 system and found that these points would 4:53 be stable for at least a month maybe 4:55 even years but they also went looking 4:57 for physical evidence of cordelowski's 5:00 cloud moons sharing the moon's orbit and 5:02 they did find some the presence of 5:04 polarized light coming from L5 suggests 5:06 some amount of dust is hanging out there 5:09 and if there's a clump of dust following 5:11 the moon in its orbit around Earth well 5:13 then you just might be able to call that 5:15 Clump a moon of sorts you know if you 5:18 really want to poke at those astronomers 5:20 in the iau whether or not a cloud moon 5:22 really does exist the stability of these 5:24 L4 and L5 points brings up an intriguing 5:26 possibility what if we could tow an 5:28 asteroid there and park it astronomers 5:31 could get the chance to study an 5:32 asteroid up close for decades while More 5:35 industrial-minded Humans mind it for 5:37 resources while nowhere close to a 5:39 reality yet this is a serious 5:40 consideration from space agencies after 5:43 all while the iau says that we only have 5:45 one capital M Moon who says we can't add 5:48 a couple more small M ones but maybe one 5:50 thing that's got you thinking about what 5:52 would happen if the Earth had a much 5:53 larger second moon than a small asteroid 5:56 something similar to the Moon in size 5:58 what would that mean for life on Earth 6:00 well it's your lucky day we've got an 6:02 episode about that over on our main 6:03 Channel all ready for you right now 6:05 check it out here and thanks for staying 6:07 curious 6:08 [Music]
It doesn’t relate to the video linked above.
Do any of these captured asteroids stay more than one or two solar orbits ?
Fascinating nevertheless thanks
I was ignorant
I think I'll spare myself the video.
A sixth-grader could have generated those ramblings.
Regards,
Yeah, that part about you’d suck as a stand up comedian. ;^)
BTW, hadn’t Anakin already murdered all the jedi children by that time?
The links to earlier topics about this will lead to the answer — short answer is yes.
Quasi-satellite may be better, they are temporary moonlets.
We should try to trap a moon for the Moon.
It could be a Moon moon.
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