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PostPosted: Fri Jun 21, 2019 9:44 am
 


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Astronomy Picture of the Day - Unusual Mountain Ahuna Mons on Asteroid Ceres

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What created this unusual mountain? There is a new theory. Ahuna Mons is the largest mountain on the largest known asteroid in our Solar System, Ceres, which orbits our Sun in the main asteroid belt between Mars and Jupiter. Ahuna Mons, though, is like nothing that humanity has ever seen before. For one thing, its slopes are garnished not with old craters but young vertical streaks. The new hypothesis, based on numerous gravity measurements, holds that a bubble of mud rose from deep within the dwarf planet and pushed through the icy surface at a weak point rich in reflective salt -- and then froze. The bright streaks are thought to be similar to other recently surfaced material such as visible in Ceres' famous bright spots. The featured double-height digital image was constructed from surface maps taken of Ceres in 2016 by the robotic Dawn mission. Successfully completing its mission in 2018, Dawn continues to orbit Ceres even though it has exhausted the fuel needed to keep its antennas pointed toward Earth.



https://apod.nasa.gov/apod/ap190616.html


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PostPosted: Fri Jun 21, 2019 9:55 am
 


Wonder if I can ski that? :D

Just saw that it's about 4km high.

Is it just me, or does it look that something just took everything in that crater and dumped it upside down to create the mountain? [huh]

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PostPosted: Fri Jun 21, 2019 9:56 am
 


Hehe, yea. Like something was digging, and left the pile beside the hole. :lol:


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PostPosted: Fri Jun 21, 2019 9:58 am
 


raydan wrote:
Wonder if I can ski that? :D



You might be able to! Gravity is a lot less on Ceres, so the moguls wouldn't be so bad. ;)


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PostPosted: Fri Jun 21, 2019 10:02 am
 


Strange that you have a hole about the same size... even though the shape is slightly different... right beside it. The sides of the hole look striated like the mountain too. 8O


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PostPosted: Fri Jun 21, 2019 10:07 am
 


Sherlock time...

...it's an impact crater since the edges are raised
...the crater is older that the mountain because there would be debris on the mountain if it was created later
...maybe the force of impact is what kick-started the mud eruption


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PostPosted: Fri Jun 21, 2019 10:15 am
 


raydan wrote:
...the crater is older that the mountain because there would be debris on the mountain if it was created later


Not necessarily! There are no debris rays extending from the crater, so the debris might have been ejected off the surface, rather than fall back down.

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PostPosted: Fri Jun 21, 2019 10:21 am
 


[drool]


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PostPosted: Tue Jun 25, 2019 11:13 am
 


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The rings of Uranus are glowing

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The rings that girdle Uranus are nowhere near as optically spectacular as those that surround Saturn. Indeed, they reflect so little light that they were not discovered until 1977.

Now, however, a composite of new images taken by the Atacama Large Millimetre/submillimetre Array (ALMA) and the Very Large Telescope (VLT), both in Chile, have provided new details.



https://cosmosmagazine.com/space/the-ri ... re-glowing


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PostPosted: Tue Jun 25, 2019 11:27 am
 


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The Falcon Heavy rocket launched early Tuesday—two cores made it back safely

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SpaceX's Falcon Heavy rocket will attempt its most technically demanding mission yet on Monday night, with a rideshare flight organized by the US Air Force. Company founder Elon Musk has characterized the mission as "[o]ur most difficult launch ever."

During this Space Test Program-2 flight, the world's most powerful operational rocket will attempt to deliver 24 different payloads into three different orbits, resulting in multiple re-lights of the Merlin 1D engine powering the rocket's second stage.

It is a critical mission for SpaceX and its Falcon Heavy rocket for a few reasons. First of all, this is the first time the Air Force has flown payloads on a Falcon Heavy rocket. And while this mission will not be carrying anything critical to national security—such as large satellites valued at $1 billion or more used for observation, communication, or other purposes to advance the national interest—Air Force officials will be watching closely.

The US military is in the middle of determining which providers among SpaceX, United Launch Alliance, Blue Origin, and Northrop Grumman will win lucrative launch contracts from 2022 to 2026. The Air Force is only expected to pick two winners, and SpaceX has said its Falcon Heavy rocket can meet all nine of the Air Force's "reference orbits," which means sending heavy payloads to some exotic orbits that require a lot of energy to reach.

The unique profile of Monday night's mission will help demonstrate that the Falcon Heavy rocket's second stage does indeed have the capability to reach all of these orbits. After the rocket launches and its second stage separates, it will perform four separate upper-stage engine burns, and then, almost like a school bus, drop off satellites at three different locations. These maneuvers will require precise performance by the upper stage over the course of six hours.

2:50am ET Tuesday Update: SpaceX's Falcon Heavy rocket launched at 2:30am ET on Tuesday morning, sending its payload of 24 satellites into space. Less than three minutes after the launch, the rocket's two side-mounted boosters separated from the first stage's center core and subsequently returned to make a safe landing near Kennedy Space Center in Florida.

At 3 minutes and 30 seconds into the flight, the rocket's upper stage separated from the center core and flew onward, into the first of several orbits. The center core then attempted to make the "hottest" landing of a Falcon rocket to date, more than 1,200km downrange on a drone ship in the Atlantic Ocean. SpaceX founder Elon Musk had warned earlier that, because of the core's exceedingly high energy during its return to Earth, it only had about a 50% chance of landing on the drone ship. It didn't quite make it, making a visible explosion as it hit the water nearby.

Meanwhile, the Falcon Heavy's upper stage still had much work to do. Over the next 3 hours and 30 minutes, it was slated to drop off 24 satellites into three different orbits.



https://arstechnica.com/science/2019/06 ... unch-ever/



Two of the payloads deployed were the aforementioned Deep Space Clock, and Bill Nye/Carl Sagan's Solar sail.

science-f47/space-thread-t98599-2205.html#p2334461

science-f47/space-thread-t98599-2220.html#p2335663


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PostPosted: Tue Jun 25, 2019 12:43 pm
 


NASA’s $1 Billion Jupiter Probe Just Sent Back Stunning New Photos Of Jupiter


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Image

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More stunning images here:

http://www.beautyofplanet.com/nasas-1-b ... ioPUzOWLig


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PostPosted: Thu Jun 27, 2019 11:27 am
 


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Highest energy photons ever recorded coming from Crab Nebula

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A very large team of researchers affiliated with several institutions in China and Japan has measured the highest energy photon ever recorded. In their paper published in the journal Physical Review Letters, the group describes their study of data from the Tibet Air Shower Gamma Collaboration and what they found.

. . .

The researchers report that they found what they believe to be 24 photon-initiated showers, with photon energies above 100 trillion electron volts—one of which registered 450 TeV. These finds represent the first measurements of high energy photons over 100 TeV and the highest ever recorded.

The researchers also used the data from the collaboration to track the paths of the photons, and found they originated in the Crab Nebula, the remains of a supernova that was first observed in 1054 AD. The Crab Nebula is located in the Perseus Arm of the Milky Way, approximately 6,500 light years away.


https://phys.org/news/2019-06-highest-e ... ebula.html


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PostPosted: Thu Jun 27, 2019 11:36 am
 


DrCaleb wrote:
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The rings of Uranus are glowing

Image

The rings that girdle Uranus are nowhere near as optically spectacular as those that surround Saturn. Indeed, they reflect so little light that they were not discovered until 1977.

Now, however, a composite of new images taken by the Atacama Large Millimetre/submillimetre Array (ALMA) and the Very Large Telescope (VLT), both in Chile, have provided new details.



https://cosmosmagazine.com/space/the-ri ... re-glowing



What's that solid ring. Obviously not a ring of Uranus but is it the lens or something?


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PostPosted: Thu Jun 27, 2019 11:50 am
 


stratos wrote:
What's that solid ring. Obviously not a ring of Uranus but is it the lens or something?


It's a solid ring, used as a filter to block out light from the edge of the planet. It helps the very faint rings show up better.

Similar filters are used to block the sun, when viewing it's corona.

https://www.spaceweatherlive.com/en/sol ... mages/soho


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PostPosted: Thu Jun 27, 2019 11:52 am
 


I want to get my hands on the $8,000 Quadrillion dollar asteroid and mine it, and make it my evil orbiting fortress.


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