Cool astronomy photos

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Witness
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Re: Cool astronomy photos

Post by Witness » Sat Dec 29, 2018 3:41 am

Something like this has already been posted, but it still impresses me – if only Andromeda were brighter:

Image

Image

Details: https://waitbutwhy.com/2014/06/andromed ... d-see.html

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Witness
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Re: Cool astronomy photos

Post by Witness » Sun Dec 30, 2018 12:57 am

Holiday asteroid imaged with NASA radar

Image

The December 2018 close approach by the large, near-Earth asteroid 2003 SD220 has provided astronomers an outstanding opportunity to obtain detailed radar images of the surface and shape of the object and to improve the understanding of its orbit.

The radar images reveal an asteroid with a length of at least one mile (1.6 kilometers) and a shape similar to that of the exposed portion of a hippopotamus wading in a river. They were obtained Dec. 15-17 by coordinating the observations with NASA's 230-foot (70-meter) antenna at the Goldstone Deep Space Communications Complex in California, the National Science Foundation's 330-foot (100-meter) Green Bank Telescope in West Virginia and the Arecibo Observatory's 1,000-foot (305-meter) antenna in Puerto Rico.

The Green Bank Telescope was the receiver for the powerful microwave signals transmitted by either Goldstone or the NASA-funded Arecibo planetary radar in what is known as a "bistatic radar configuration." Using one telescope to transmit and another to receive can yield considerably more detail than would one telescope, and it is an invaluable technique to obtain radar images of closely approaching, slowly rotating asteroids like this one.

"The radar images achieve an unprecedented level of detail and are comparable to those obtained from a spacecraft flyby," said Lance Benner of the Jet Propulsion Laboratory in Pasadena, California, and the scientist leading the observations from Goldstone. "The most conspicuous surface feature is a prominent ridge that appears to wrap partway around the asteroid near one end. The ridge extends about 330 feet [100 meters] above the surrounding terrain. Numerous small bright spots are visible in the data and may be reflections from boulders. The images also show a cluster of dark, circular features near the right edge that may be craters."

The images confirm what was seen in earlier "light curve" measurements of sunlight reflected from the asteroid and from earlier radar images by Arecibo: 2003 SD220 has an extremely slow rotation period of roughly 12 days. It also has what seems to be a complex rotation somewhat analogous to a poorly thrown football. Known as "non-principal axis" rotation, it is uncommon among near-Earth asteroids, most of which spin about their shortest axis.

With resolutions as fine as 12 feet (3.7 meters) per pixel, the detail of these images is 20 times finer than that obtained during the asteroid's previous close approach to Earth three years ago, which was at a greater distance. The new radar data will provide important constraints on the density distribution of the asteroid's interior -- information that is available on very few near-Earth asteroids.
https://www.sciencedaily.com/releases/2 ... 162221.htm

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Anaxagoras
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Re: Cool astronomy photos

Post by Anaxagoras » Mon Dec 31, 2018 5:15 am



Clearly fake!!!11!
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Witness
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Re: Cool astronomy photos

Post by Witness » Tue Jan 01, 2019 1:52 am

Anaxagoras wrote:
Mon Dec 31, 2018 5:15 am
Clearly fake!!!11!
Indeed. Fisheye lens to hide the flatness of the Earth! :x



If you have time on your hands:


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Re: Cool astronomy photos

Post by Witness » Tue Jan 01, 2019 2:54 am

How to spend New Year’s Eve with NASA watching New Horizons’ flyby of Ultima Thule

This New Year's, you can go to a boring old bar like everyone else, or you can celebrate the dawning of another year by watching NASA's New Horizons spacecraft make history.

At 12:33 a.m. EST on January 1, the craft will fly within 2,200 miles (3,540 km) of 2014 MU69, more commonly known as Ultima Thule, an object far out beyond Pluto in the Kuiper Belt. NASA will be broadcasting the event on NASA TV and providing updates through their social media channels. You can find more details through the New Horizons mission page.

This will be the farthest object ever visited by a spacecraft, and New Horizons will come three times closer to Ultima Thule than it came to Pluto in 2015. The object is around 19 miles (30km) in diameter, shaped something like a peanut and is likely red in color. Ultima Thule orbits the sun about once every 295 years, and has likely been almost undisturbed since it was formed during the early days of the solar system, making it an exciting target for astronomers.

The flyby will take place about four billion miles (6.6 billion km) from Earth. Because of this, radio signals carrying information from New Horizons to NASA's Deep Space Network will take more than six hours to make the trip, and we'll have to wait just a little bit longer to see Ultima Thule.
[…]
Johns Hopkins University Applied Physics Laboratory will provide a live webcast of the event which can be viewed here.
http://www.astronomy.com/news/2018/12/h ... tima-thule

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Re: Cool astronomy photos

Post by Anaxagoras » Tue Jan 01, 2019 8:47 am

A fool thinks himself to be wise, but a wise man knows himself to be a fool.
William Shakespeare

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Witness
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Re: Cool astronomy photos

Post by Witness » Thu Jan 03, 2019 12:49 am

Image

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Re: Cool astronomy photos

Post by Anaxagoras » Thu Jan 03, 2019 1:49 am

A fool thinks himself to be wise, but a wise man knows himself to be a fool.
William Shakespeare

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Bruce
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Re: Cool astronomy photos

Post by Bruce » Thu Jan 03, 2019 3:14 am

Space gourd
Image
Such potential!

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Re: Cool astronomy photos

Post by Witness » Thu Jan 03, 2019 4:57 am

Chang’e 4 successfully landed on the far side of the moon.

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Rob Lister
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Re: Cool astronomy photos

Post by Rob Lister » Thu Jan 03, 2019 11:15 am

Witness wrote:
Thu Jan 03, 2019 4:57 am
Chang’e 4 successfully landed on the far side of the moon.
Image
https://www.cnbc.com/2019/01/02/china-l ... -moon.html

Looks surprisingly like a pretzel or hotdog street vendor cart.

Image

In the earlier post, I wondered what the orbit of the relay satellite would be. I figured a very elliptical orbit to minimize black-out time. Wow was I way off track.

Image

Those clever fuckers.

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Re: Cool astronomy photos

Post by Anaxagoras » Thu Jan 03, 2019 1:30 pm

Witness wrote:
Thu Jan 03, 2019 4:57 am
Chang’e 4 successfully landed on the far side of the moon.
First photos published:

Image

https://www.businessinsider.com/photos- ... ing-2019-1
A fool thinks himself to be wise, but a wise man knows himself to be a fool.
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Re: Cool astronomy photos

Post by Witness » Fri Jan 04, 2019 3:41 am

Image

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Anaxagoras
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Re: Cool astronomy photos

Post by Anaxagoras » Sun Jan 06, 2019 1:43 pm

https://gfycat.com/HospitableObedientCurassow
A fool thinks himself to be wise, but a wise man knows himself to be a fool.
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Witness
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Re: Cool astronomy photos

Post by Witness » Mon Jan 07, 2019 4:06 am

Image

And then it will capsize in the crater ahead, I presume. :twisted:

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Anaxagoras
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Re: Cool astronomy photos

Post by Anaxagoras » Mon Jan 07, 2019 4:12 am

I wonder if it can go into the crater safely, and if it does, whether it can get back out again.

I suspect they won't take that risk. At least not yet anyway.

But gravity being so light there, I would imagine it would be possible. Going up a slope would be easier than going up a similar slope under Earth gravity.
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Rob Lister
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Re: Cool astronomy photos

Post by Rob Lister » Mon Jan 07, 2019 9:39 am

Anaxagoras wrote:
Mon Jan 07, 2019 4:12 am
But gravity being so light there, I would imagine it would be possible. Going up a slope would be easier than going up a similar slope under Earth gravity.
But only 16% the traction. And those wheels ain't exactly snow tires.

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Re: Cool astronomy photos

Post by Anaxagoras » Mon Jan 07, 2019 3:48 pm

Rob Lister wrote:
Mon Jan 07, 2019 9:39 am
Anaxagoras wrote:
Mon Jan 07, 2019 4:12 am
But gravity being so light there, I would imagine it would be possible. Going up a slope would be easier than going up a similar slope under Earth gravity.
But only 16% the traction. And those wheels ain't exactly snow tires.
True, and although the weight would be less, the mass is unchanged.

The Apollo astronauts had a moon buggy. I wonder if it even got stuck and needed someone to get out and push.
A fool thinks himself to be wise, but a wise man knows himself to be a fool.
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Witness
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Re: Cool astronomy photos

Post by Witness » Tue Jan 08, 2019 1:11 am


Hubble takes gigantic image of the Triangulum Galaxy

This new image of the Triangulum Galaxy—also known as Messier 33 or NGC 598—has a staggering 665 million pixels and showcases the central region of the galaxy and its inner spiral arms. To stitch together this gigantic mosaic, Hubble's Advanced Camera for Surveys needed to create 54 separate images.

Under excellent dark-sky conditions, the Triangulum Galaxy can be seen with the naked eye as a faint, blurry object in the constellation of Triangulum (the Triangle), where its ethereal glow is an exciting target for amateur astronomers.

At only three million light-years from Earth, the Triangulum Galaxy is a notable member of the Local Group—it is the group's third-largest galaxy, but also the smallest spiral galaxy in the group. It measures only about 60 000 light-years across, compared to the 200 000 light-years of the Andromeda Galaxy; the Milky Way lies between these extremes at about 100 000 light-years in diameter.

The Triangulum Galaxy is not only surpassed in size by the other two spirals, but by the multitude of stars they contain. The Triangulum Galaxy has at least an order of magnitude less stars than the Milky Way and two orders of magnitude less than Andromeda. These numbers are hard to grasp when already in this image 10 to 15 million individual stars are visible.
https://phys.org/news/2019-01-hubble-gi ... alaxy.html


Image

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Re: Cool astronomy photos

Post by Witness » Tue Jan 08, 2019 7:38 pm

https://i.imgur.com/2HAQexm.gifv
Sidereal day length and axial tilt for the 8 largest planets in our Solar System.