¿ Astronomy Picture of the Day [1]Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2021 April 5 [2]A closeup image of the Veil Nebula taken by the Hubble Space Telescope. See Explanation. Veil Nebula: Wisps of an Exploded Star Image Credit: [3]ESA/Hubble & [4]NASA, [5]Z. Levay Explanation: Wisps like this are all that remain visible of a Milky Way star. About 7,000 years ago that star exploded in a [6]supernova leaving the [7]Veil Nebula. At the time, the [8]expanding cloud was likely as bright as a crescent [9]Moon, remaining visible for weeks to people living at the dawn of [10]recorded history. Today, the resulting [11]supernova remnant, also known as the [12]Cygnus Loop, has faded and is [13]now visible only through a small telescope [14]directed toward the [15]constellation of the Swan ([16]Cygnus). The remaining [17]Veil [18]Nebula is physically huge, however, and even though it lies about 1,400 [19]light-years distant, it covers over five times the size of the [20]full Moon. The [21]featured picture is a [22]Hubble Space Telescope mosaic of six images together covering a span of only about two light years, a small part of the expansive [23]supernova remnant. In images of the [24]complete Veil Nebula, even [25]studious readers might not be able to [26]identify the featured filaments. Tomorrow's picture: sisters of mars __________________________________________________________________ [27]< | [28]Archive | [29]Submissions | [30]Index | [31]Search | [32]Calendar | [33]RSS | [34]Education | [35]About APOD | [36]Discuss | [37]> __________________________________________________________________ Authors & editors: [38]Robert Nemiroff ([39]MTU) & [40]Jerry Bonnell ([41]UMCP) NASA Official: Phillip Newman [42]Specific rights apply. [43]NASA Web Privacy Policy and Important Notices A service of: [44]ASD at [45]NASA / [46]GSFC & [47]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://apod.nasa.gov/apod/image/2104/VeilDetail_Hubble_10743.jpg 3. https://esahubble.org/ 4. https://www.nasa.gov/ 5. https://www.stsci.edu/contents/newsletters/2018-volume-35-issue-03/karen-and-zolt-levay-retire 6. http://heasarc.gsfc.nasa.gov/docs/snr.html 7. http://www.skyhound.com/sh/archive/aug1/NGC_6960.html 8. https://apod.nasa.gov/apod/ap010928.html 9. https://apod.nasa.gov/apod/ap120205.html 10. http://news.bbc.co.uk/1/hi/sci/tech/334517.stm 11. https://apod.nasa.gov/apod/supernova_remnants.html 12. https://apod.nasa.gov/apod/ap200928.html 13. https://www.youtube.com/watch?v=_O7l9m2pFXM 14. https://www.youtube.com/watch?v=3qOmu-5Uanc 15. https://en.wikipedia.org/wiki/Constellation 16. https://en.wikipedia.org/wiki/Cygnus_(constellation) 17. http://en.wikipedia.org/wiki/Veil 18. https://en.wikipedia.org/wiki/Veil_Nebula 19. https://chandra.harvard.edu/photo/cosmic_distance.html 20. https://apod.nasa.gov/apod/ap160201.html 21. https://esahubble.org/images/potw2113a/ 22. https://www.nasa.gov/mission_pages/hubble/story/index.html 23. https://www.nasa.gov/audience/forstudents/5-8/features/nasa-knows/what-is-a-supernova.html 24. https://apod.nasa.gov/apod/ap191031.html 25. https://previews.123rf.com/images/duben/duben1907/duben190700009/128483090-dog-reading-book-with-eyeglasses-professor-behind-the-book.jpg 26. http://asterisk.apod.com/discuss_apod.php?date=210405 27. https://apod.nasa.gov/apod/ap210404.html 28. https://apod.nasa.gov/apod/archivepix.html 29. https://apod.nasa.gov/apod/lib/apsubmit2015.html 30. https://apod.nasa.gov/apod/lib/aptree.html 31. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 32. https://apod.nasa.gov/apod/calendar/allyears.html 33. https://apod.nasa.gov/apod.rss 34. https://apod.nasa.gov/apod/lib/edlinks.html 35. https://apod.nasa.gov/apod/lib/about_apod.html 36. http://asterisk.apod.com/discuss_apod.php?date=210405 37. https://apod.nasa.gov/apod/ap210406.html 38. http://www.phy.mtu.edu/faculty/Nemiroff.html 39. http://www.phy.mtu.edu/ 40. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 41. http://www.astro.umd.edu/ 42. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 43. https://www.nasa.gov/about/highlights/HP_Privacy.html 44. https://astrophysics.gsfc.nasa.gov/ 45. https://www.nasa.gov/ 46. https://www.nasa.gov/centers/goddard/ 47. http://www.mtu.edu/