Posted on Aug 17, 2021

APOD: 2021 August 17 - M57: The Ring Nebula from Hubble

Maj William W. 'Bill' Price

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Good morning, Rallypoint. Today's Astronomy Picture of the Day (APOD) is titled "The Ring Nebula from Hubble." The Ring Nebula (aka Messier 57/M57) is about one light year across and lies some 2,500 light years away in the constellation Lyra. Researchers believe that the central star is in its last stages of its evolution before becoming a white dwarf. The ionized gas that makes up the Ring Nebula was expelled from the star. We see M57 as a circle due to our vantage point...data collected by Hubble and other sources indicate that the Ring Nebula is actually shaped like a football. We just happen to be able to look down its long axis, making it appear spherical to us.

APOD: 2021 August 17 - M57: The Ring Nebula from Hubble

Posted from apod.nasa.gov

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LTC Stephen F.

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Johnny Cash - Ring Of Fire (Live)

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Thank you my friend Maj William W. 'Bill' Price for posting the NASA Astronomy Picture of the Day (APOD) for Tuesday, August 17, 2021 entitled "The Ring Nebula from Hubble."

Image: M57 - The Ring Nebula from Hubble - Image Credit NASA, ESA, Hubble Legacy Archive; Processing - Judy Schmidt

APOD Background
"Explanation: Except for the rings of Saturn, the Ring Nebula (M57) is probably the most famous celestial circle. Its classic appearance is understood to be due to our own perspective, though. The recent mapping of the expanding nebula's 3-D structure, based in part on this clear Hubble image,indicates that the nebula is a relatively dense, donut-like ring wrapped around the middle of a (American) football-shaped cloud of glowing gas. The view from planet Earth looks down the long axis of the football, face-on to the ring. Of course, in this well-studied example of a planetary nebula, the glowing material does not come from planets. Instead, the gaseous shroud represents outer layers expelled from the dying, once sun-like star, now a tiny pinprick of light seen at the nebula's center. Intense ultraviolet light from the hot central star ionizes atoms in the gas. The Ring Nebula is about one light-year across and 2,500 light-years away.

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https://www.youtube.com/watch?v=b-zNQA5Xi4Q

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LTC Stephen F.

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