Astronomy Picture of the Day (APOD)
02-23-2017, 07:09 AM,
RE: Astronomy Picture of the Day (APOD)
Polar Ring Galaxy NGC 660

[Image: NGC660_80Chart32_1024.jpg]

Source: APOD, 2017 February 23

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02-24-2017, 08:08 AM,
RE: Astronomy Picture of the Day (APOD)
NGC 3621: Far Beyond the Local Group

[Image: NGC3621-HST-ESO-gendler1024.jpg]

Source: APOD, 2017 February 24

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02-27-2017, 05:08 AM,
RE: Astronomy Picture of the Day (APOD)
Four Quasar Images Surround a Galaxy Lens

[Image: QuadQuasarLens_Hubble_960.jpg]

APOD Wrote:Explanation: An odd thing about the group of lights near the center is that four of them are the same distant quasar. This is because the foreground galaxy -- in the center of the quasar images and the featured image -- is acting like a choppy gravitational lens. A perhaps even odder thing is that by watching these background quasars flicker, you can estimate the expansion rate of the universe. That is because the flicker timing increases as the expansion rate increases. But to some astronomers, the oddest thing of all is that these multiply imaged quasars indicate a universe that is expanding a bit faster than has been estimated by different methods that apply to the early universe. And that is because ... well, no one is sure why. Reasons might include an unexpected distribution of dark matter, some unexpected effect of gravity, or something completely different. Perhaps future observations and analyses of this and similarly lensed quasar images will remove these oddities.

Source: APOD, 2017 February 27

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02-27-2017, 12:40 PM,
RE: Astronomy Picture of the Day (APOD)
Images of the Sun From the GOES-16 Satellite

[Image: suvi_horz2.png?itok=6707I4vA]

Source: NASA Image of the Day, 2017 February 27

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03-03-2017, 12:54 PM,
RE: Astronomy Picture of the Day (APOD)
Hubble Showcases a Remarkable Galactic Hybrid

[Image: potw1709a.jpg?itok=jWB0No4a]

NASA Wrote:This NASA/ESA Hubble Space Telescope image showcases the remarkable galaxy UGC 12591. UGC 12591 sits somewhere between a lenticular and a spiral. It lies just under 400 million light-years away from us in the westernmost region of the Pisces–Perseus Supercluster, a long chain of galaxy clusters that stretches out for hundreds of light-years — one of the largest known structures in the cosmos.

The galaxy itself is also extraordinary: it is incredibly massive. The galaxy and its halo together contain several hundred billion times the mass of the sun; four times the mass of the Milky Way. It also whirls round extremely quickly, rotating at speeds of up to 1.8 million kilometers (1.1 million miles) per hour.

Observations with Hubble are helping astronomers to understand the mass of UGC 1259, and to determine whether the galaxy simply formed and grew slowly over time, or whether it might have grown unusually massive by colliding and merging with another large galaxy at some point in its past.

Source: NASA Image of the Day, 2017 March 03

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