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Old Mon, Jul-16-2018, 01:19:44 AM   #1241
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Default Re: All things Space!

https://www.theverge.com/2017/2/22/1...er-nature-nasa





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Old Wed, Jul-18-2018, 03:54:23 AM   #1242
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Default Re: All things Space!

https://www.msn.com/en-us/news/techn...LXo?li=BBnb7Kz

Astronomers have found a new crop of moons around Jupiter, and one of them is a weirdo

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Ten more moons have been confirmed to orbit around Jupiter, bringing the planetís total known satellite count to 79. Thatís the highest number of moons of any planet in the Solar System. And these newly discovered space rocks are giving astronomers insight as to why the Jupiter system looks like it does today.

Astronomers at Carnegie Institution for Science first found these moons in March 2017, along with two others that were already confirmed in June of last year. The team initially found all 12 moons using the Blanco 4-meter telescope in Chile, though finding these objects wasnít their main goal. Instead, they were searching for incredibly distant small objects ó or even planets ó that might be lurking in our Solar System beyond Pluto. But as they searched for these fringe space rocks, they decided to take a peek at what might be lurking around Jupiter at the same time. Now, the moons they found have been observed multiple times, and their exact orbits have been submitted for approval from the International Astronomical Union, which officially recognizes celestial bodies.

These moons are all pretty tiny, ranging between less than a mile and nearly two miles wide. And they break down into three different types. Two orbit closer to Jupiter, moving in the same direction that the planet spins. Farther out from those, about 15.5 million miles from the planet, there are nine that rotate in the opposite direction, moving against Jupiterís rotation. But in this same distant region, one strange moon that astronomers are calling Valetudo is moving with Jupiterís spin, like the two inner moons. That means itís going in the opposite direction of all the other moons in the same area. ďItís basically driving down the highway in the wrong direction,Ē Scott Sheppard, an astronomer at Carnegie who led the discovery team, tells The Verge. ďThatís a very unstable situation. Head on collisions are likely to happen in that situation.Ē

Valetudo isnít the only moon of Jupiter that acts this way. Another moon called Carpo also orbits far out from Jupiter, moving in the opposite direction of many other moons in the area. However, Valetudo orbits much farther away than Carpo, and it may actually be the smallest moon Jupiter has. Now with this discovery, astronomers think itís good evidence that moon-on-moon collisions have happened in Jupiterís past, and these are responsible for the lunar landscape around the planet today. ďValetudo, at just 1 kilometer across, is probably the last remnant of a much larger moon thatís been ground down into dust over time,Ē says Sheppard.
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Finding moons around Jupiter can be tough. As the biggest planet in our Solar System, it has a very large area of influence, so thereís a lot of space where moons could potentially be. Itís difficult to search that area in a timely manner with a telescope. ďItís like looking through a straw, and youíre just covering as many points around Jupiter as you can looking for these things,Ē says Sheppard. And since Jupiter is so large, it reflects a whole lot of light. That means there can be a lot of glare when searching for super faint moons around the planet.

Fortunately, the Blanco 4-meter telescope the scientists were using was the perfect piece of equipment to find these moons. It has the largest camera of any large-class telescope out there, and it allowed the astronomers to cover a big area of space around Jupiter in a shorter amount of time. Additionally, Blancoís camera is well-shaded, according to Sheppard, which helped reduce the glare and scattered light from Jupiter.

This also makes Blanco adept at finding incredibly distant, faint objects, which is why the Carnegie scientists have been using the telescope to do a massive survey of bodies beyond Pluto. While scanning the night sky in March of last year, the team noticed that Jupiter happened to be directly overhead in the sky. So they decided to multitask: they would search for objects moving at roughly the same rate as Jupiter ó potential moons ó as well as objects moving much more slowly in the distant Solar System. After identifying 12 possible Jupiter moons, they reobserved the planet a month later and then again in May of this year with different telescopes to confirm what they had seen.

Sheppard believes this new crop of moons tells a big story about Jupiterís past. The astronomers argue that those nine moons, all moving in the same direction far out from Jupiter, may actually be pieces of a bigger moons that existed long ago. Some of them share specific traits with each other, like the same orbital angles, which makes the scientists think that these moons are actually fragments of three larger moons. ďWe think, originally, there were three parent bodies, and, somehow, each of those parent bodies got broken apart. And a big question is: what broke those objects apart?Ē says Sheppard. Thatís where Valetudo comes in. With a moon like that nearby, itís possible that numerous head-on collisions occurred, reducing these objects to the small sizes we see today.


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Old Fri, Jul-20-2018, 11:43:09 AM   #1243
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Default Re: All things Space!

July 20, 1969, at 20:17 UTC.



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Last edited by hogger453; Fri, Jul-20-2018 at 11:47:40 AM.
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Old Fri, Jul-20-2018, 12:06:37 PM   #1244
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Old Fri, Jul-20-2018, 07:39:10 PM   #1245
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Default Re: All things Space!

https://www.timeanddate.com/eclipse/map/2018-july-27
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Old Fri, Jul-20-2018, 07:48:18 PM   #1246
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Default Re: All things Space!

https://www.timeanddate.com/eclipse/map/2019-january-21
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Old Fri, Jul-20-2018, 10:44:18 PM   #1247
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Default Re: All things Space!

There is something going on with our sun.

https://www.msn.com/en-us/news/techn...mIu?li=BBnb7Kz
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Old Mon, Jul-23-2018, 02:22:52 AM   #1248
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Old Mon, Jul-30-2018, 04:33:05 AM   #1249
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Old Sun, Aug-19-2018, 01:00:48 AM   #1250
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Discussing All things Space! in the Off Topic Forum - Place to discuss this and that. Note: We also have "request to join" forums: Guns and Fitness.
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