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134487 author: apod@reentry.codl.fr 21 Dec 05:36
https://apod.nasa.gov/apod/ap241221.html
tags: #apod

A Year in Sunsets

Image Credit & Copyright: Wael Omar

33340 author: appassionato@mastodon.social 26 Aug 2024 09:55
tags: #apod #astrophotography #cygnusloop

Filaments of the Cygnus Loop

Subtle and delicate in appearance, these ribbons of shocked interstellar gas are part of a blast wave at the expanding edge of a violent stellar explosion that would have been easily visible to humans during the late stone age, about 20,000 years ago.

Image Credit: ESA/Hubble & NASA, W. Blair; Acknowledgement: Leo Shatz

#astrophotography
#CygnusLoop

The featured image was recorded by the Hubble Space Telescope and is a closeup of the outer edge of a supernova remnant known as the Cygnus Loop or Veil Nebula. The filamentary shock front is moving toward the top of the frame at about 170 kilometers per second, while glowing in light emitted by atoms of excited hydrogen gas. The distances to stars thought to be interacting with the Cygnus Loop have recently been found by the Gaia mission to be about 2400 light years distant. The whole Cygnus Loop spans six full Moons across the sky, corresponding to about 130 light years, and parts can be seen with a small telescope toward the constellation of the Swan (Cygnus).