Cool astronomy photos

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Anaxagoras
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Re: Cool astronomy photos

Post by Anaxagoras »

Image

Taken in Rovaniemi, Finland. The week in pictures, BBC
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ed
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Re: Cool astronomy photos

Post by ed »

I only saw the aurora once. Impressive stuff.
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Re: Cool astronomy photos

Post by Abdul Alhazred »

Reminds me of something.
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Re: Cool astronomy photos

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Andromeda galaxy with and without foreground stars:

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Re: Cool astronomy photos

Post by sparks »

What are the two white blobs top and bottom?
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Re: Cool astronomy photos

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sparks wrote: Mon Sep 21, 2020 1:58 am What are the two white blobs top and bottom?
Other galaxies. Much farther away. The Andromeda galaxy is one of the relatively close ones. In fact, other than some dwarf galaxies, I think it's the closest large galaxy.
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Re: Cool astronomy photos

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Anaxagoras wrote: Mon Sep 21, 2020 2:53 am
sparks wrote: Mon Sep 21, 2020 1:58 am What are the two white blobs top and bottom?
Other galaxies. Much farther away. The Andromeda galaxy is one of the relatively close ones. In fact, other than some dwarf galaxies, I think it's the closest large galaxy.
Not "much farther away": these are satellite galaxies of M31/Andromeda.
Wikipedia wrote:The Andromeda Galaxy (M31) has satellite galaxies just like the Milky Way. Orbiting M31 are at least 13 dwarf galaxies: the brightest and largest is M110, which can be seen with a basic telescope. The second-brightest and closest one to M31 is M32. The other galaxies are fainter, and were mostly discovered only starting from the 1970s.

Image
The Andromeda Galaxy with M110 at upper left and M32 to the right of the core.
List of satellite galaxies of Andromeda: https://en.wikipedia.org/wiki/List_of_A ... e_galaxies
Ditto for our own: https://en.wikipedia.org/wiki/Satellite ... _Milky_Way

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Re: Cool astronomy photos

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Witness wrote: Mon Sep 21, 2020 11:55 pm
Anaxagoras wrote: Mon Sep 21, 2020 2:53 am Not "much farther away": these are satellite galaxies of M31/Andromeda.
Oh dear, it seems I have spoken ignorantly.

I mistakenly thought they were large elliptical galaxies but far away. I should have checked.

I think they are elliptical, but small ones.
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Re: Cool astronomy photos

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Anaxagoras wrote: Tue Sep 22, 2020 12:14 am
Witness wrote: Mon Sep 21, 2020 11:55 pm
Anaxagoras wrote: Mon Sep 21, 2020 2:53 am Not "much farther away": these are satellite galaxies of M31/Andromeda.
Oh dear, it seems I have spoken ignorantly.

I mistakenly thought they were large elliptical galaxies but far away. I should have checked.

I think they are elliptical, but small ones.
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Re: Cool astronomy photos

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Lunar analemma:

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Photographic stack of the lunar phases obtained every day at the same time, plus 51 minutes of offset to compensate the Earth's translation, in a total period of 29.5 days, carried out at a distance of 8 kilometers from Toledo. This peculiar shape is due to the synodic curve formed by the inclined and elliptical orbit of our satellite, whose aspect changes gradually each lunar cycle.

Due to adverse weather conditions, some of these photos could not be taken during the same period as the rest, so they were obtained from a previous lunar cycle, and to achieve the position at the same time, several of them were taken during the day for what they were digitally treated to give them a nocturnal appearance. Also indicate that, to adapt it to the landscape, the relative dimensions of the complete analema have been reduced proportionally, but maintaining the aspect and the real size of the Moon in relation to the city, as observed at that distance.
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Re: Cool astronomy photos

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asthmatic camel wrote: Tue Sep 22, 2020 3:58 pm
Anaxagoras wrote: Tue Sep 22, 2020 12:14 am
Witness wrote: Mon Sep 21, 2020 11:55 pm
Anaxagoras wrote: Mon Sep 21, 2020 2:53 am Not "much farther away": these are satellite galaxies of M31/Andromeda.
Oh dear, it seems I have spoken ignorantly.

I mistakenly thought they were large elliptical galaxies but far away. I should have checked.

I think they are elliptical, but small ones.
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No! Not forgiven. I shall hold disdain for you for this gross negligence forever! Some things can never be forgiven.


Not really. I was just looking for an excuse to post that. :D
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Re: Cool astronomy photos

Post by Anaxagoras »

This guy has some nice stuff:

https://www.johnkrausphotos.com
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Re: Cool astronomy photos

Post by shemp »

asthmatic camel wrote: Tue Sep 22, 2020 3:58 pm
Anaxagoras wrote: Tue Sep 22, 2020 12:14 am
Witness wrote: Mon Sep 21, 2020 11:55 pm
Anaxagoras wrote: Mon Sep 21, 2020 2:53 am Not "much farther away": these are satellite galaxies of M31/Andromeda.
Oh dear, it seems I have spoken ignorantly.

I mistakenly thought they were large elliptical galaxies but far away. I should have checked.

I think they are elliptical, but small ones.
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Re: Cool astronomy photos

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The first-ever image of a black hole is now a movie

Pictures created from old observations show the void’s stormy evolution over the past decade.

Image

The historic first image of a black hole unveiled last year has now been turned into a movie. The short sequence of frames shows how the appearance of the black hole’s surroundings changes over years as its gravity stirs the material around it into a constant maelstrom.

The images show a lopsided blob of light swirling around the supermassive black hole at the centre of the galaxy M87. To create them, the Event Horizon Telescope (EHT) collaboration — which harnesses a planet-wide network of observatories — exhumed old data on the black hole and combined these with a mathematical model based on the image released in April 2019, to show how the surroundings have evolved over eight years. Although it relies partly on guesswork, the result gives astronomers rich insights into the behaviour of black holes, the intense gravity of which sucks in matter and light around them.

“Because the flow of matter falling onto a black hole is turbulent, we can see that the ring wobbles with time,” says lead author Maciek Wielgus, a radio astronomer at Harvard University in Cambridge, Massachusetts.
https://www.nature.com/articles/d41586- ... 479NdPP3E0
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Re: Cool astronomy photos

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93.6Hrs total exposure time over 7nights - The Squid Nebula

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https://old.reddit.com/r/Astronomy/comm ... time_over/

Fid dick comment in 3… 2… 1… :mrgreen:
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Re: Cool astronomy photos

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Cosmic dog shit........











......from Sirius, of course. :D
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Re: Cool astronomy photos

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Witness wrote: Fri Sep 25, 2020 8:53 pm
93.6Hrs total exposure time over 7nights - The Squid Nebula

Image
https://old.reddit.com/r/Astronomy/comm ... time_over/

Fid dick comment in 3… 2… 1… :mrgreen:
Looks to be a double header. You know me too well sir.
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Re: Cool astronomy photos

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Orion never does clean up after that damn dog.
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Re: Cool astronomy photos

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Enceladus in Infrared

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One of our Solar System's most tantalizing worlds, icy Saturnian moon Enceladus appears in these detailed hemisphere views from the Cassini spacecraft. In false color, the five panels present 13 years of infrared image data from Cassini's Visual and Infrared Mapping Spectrometer and Imaging Science Subsystem. Fresh ice is colored red, and the most dramatic features look like long gashes in the 500 kilometer diameter moon's south polar region. They correspond to the location of tiger stripes, surface fractures that likely connect to an ocean beneath the Enceladus ice shell. The fractures are the source of the moon's icy plumes that continuously spew into space. The plumes were discovered by by Cassini in 2005. Now, reddish hues in the northern half of the leading hemisphere view also indicate a recent resurfacing of other regions of the geologically active moon, a world that may hold conditions suitable for life.
https://apod.nasa.gov/apod/ap200924.html
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Re: Cool astronomy photos

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At some point these enlarged, throbbing, pulsating fountains of salty water will...
will...

ahem...

astronomy...Mars is at opposition.
... The stars were suns, but so far away they were just little points of light ... The scale of the universe suddenly opened up to me. It was a kind of religious experience. There was a magnificence to it, a grandeur, a scale which has never left me. Never ever left me.
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