¿ 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 May 18 [2]A picture of the Necklace Nebula showing a ring of jets, as taken by the Hubble Space Telescope. Please see the explanation for more detailed information. Jets from the Necklace Nebula Image Credit: [3]ESA, [4]Hubble, [5]NASA; Processing: [6]K. Noll Explanation: What celestial body wears the Necklace Nebula? First, analyses indicate that [7]the Necklace is a [8]planetary nebula, a gas cloud emitted by a [9]star toward the end of its life. Also, what appears to be [10]diamonds in the Necklace are actually bright [11]knots of glowing gas. In the center of the Necklace Nebula are likely [12]two stars orbiting so [13]close together that they share a common atmosphere and appear as one in the [14]featured image by the [15]Hubble Space Telescope. The red-glowing gas clouds on the upper left and lower right are the results of [16]jets from the center. Exactly when and how the bright jets formed remains a [17]topic [18]of [19]research. The Necklace Nebula is only about 5,000 years old, spans about 5 [20]light years, and can best be found with a [21]large telescope toward the direction of the constellation of the Arrow ([22]Sagitta). Tomorrow's picture: jellyfish in space __________________________________________________________________ [23]< | [24]Archive | [25]Submissions | [26]Index | [27]Search | [28]Calendar | [29]RSS | [30]Education | [31]About APOD | [32]Discuss | [33]> __________________________________________________________________ Authors & editors: [34]Robert Nemiroff ([35]MTU) & [36]Jerry Bonnell ([37]UMCP) NASA Official: Phillip Newman [38]Specific rights apply. [39]NASA Web Privacy Policy and Important Notices A service of: [40]ASD at [41]NASA / [42]GSFC & [43]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://apod.nasa.gov/apod/image/2105/Necklace_Hubble_2029.jpg 3. https://www.esa.int/ 4. https://esahubble.org/ 5. https://www.nasa.gov/ 6. https://science.gsfc.nasa.gov/sed/bio/keith.s.noll 7. https://en.wikipedia.org/wiki/Necklace_Nebula 8. https://apod.nasa.gov/apod/planetary_nebulae.html 9. https://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve 10. https://apod.nasa.gov/apod/ap060330.html 11. https://apod.nasa.gov/apod/ap080413.html 12. https://apod.nasa.gov/apod/ap191016.html 13. https://i.redd.it/l7sa1g7vk9u41.jpg 14. https://esahubble.org/images/potw2117a/ 15. https://www.nasa.gov/mission_pages/hubble/main/index.html 16. https://apod.nasa.gov/apod/ap140204.html 17. https://academic.oup.com/mnrasl/article/428/1/L39/1032598 18. https://ui.adsabs.harvard.edu/abs/2013MNRAS.428L..39M/abstract 19. https://academic.oup.com/mnrasl/article/428/1/L39/1032598 20. https://spaceplace.nasa.gov/light-year/en/ 21. https://en.wikipedia.org/wiki/List_of_largest_optical_reflecting_telescopes 22. https://en.wikipedia.org/wiki/Sagitta 23. https://apod.nasa.gov/apod/ap210517.html 24. https://apod.nasa.gov/apod/archivepix.html 25. https://apod.nasa.gov/apod/lib/apsubmit2015.html 26. https://apod.nasa.gov/apod/lib/aptree.html 27. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 28. https://apod.nasa.gov/apod/calendar/allyears.html 29. https://apod.nasa.gov/apod.rss 30. https://apod.nasa.gov/apod/lib/edlinks.html 31. https://apod.nasa.gov/apod/lib/about_apod.html 32. http://asterisk.apod.com/discuss_apod.php?date=210518 33. https://apod.nasa.gov/apod/ap210519.html 34. http://www.phy.mtu.edu/faculty/Nemiroff.html 35. http://www.phy.mtu.edu/ 36. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 37. http://www.astro.umd.edu/ 38. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 39. https://www.nasa.gov/about/highlights/HP_Privacy.html 40. https://astrophysics.gsfc.nasa.gov/ 41. https://www.nasa.gov/ 42. https://www.nasa.gov/centers/goddard/ 43. http://www.mtu.edu/