¿ 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. 2020 October 4 [2]See Explanation. Clicking on the picture will download the highest resolution version available. Orion Nebula in Oxygen, Hydrogen, and Sulfur Image Credit & Copyright: [3]César Blanco González Explanation: Few astronomical sights excite the imagination like the nearby stellar nursery known as the Orion Nebula. [4]The Nebula's glowing gas surrounds hot young stars at the edge of an immense interstellar [5]molecular cloud. Many of the filamentary structures visible in the featured image are actually [6]shock waves - fronts where fast moving material encounters slow moving gas. The Orion Nebula spans about 40 [7]light years and is located about 1500 light years away in the [8]same spiral arm of our Galaxy as the [9]Sun. The Great Nebula in [10]Orion can be found with the unaided eye just below and to the left of the easily identifiable [11]belt of three stars in the popular constellation Orion. The image shows the nebula in [12]three colors specifically emitted by [13]hydrogen, [14]oxygen, and [15]sulfur gas. The [16]whole Orion Nebula cloud complex, which [17]includes the [18]Horsehead Nebula, will slowly disperse over the next 100,000 years. Tomorrow's picture: hubble spiral __________________________________________________________________ [19]< | [20]Archive | [21]Submissions | [22]Index | [23]Search | [24]Calendar | [25]RSS | [26]Education | [27]About APOD | [28]Discuss | [29]> __________________________________________________________________ Authors & editors: [30]Robert Nemiroff ([31]MTU) & [32]Jerry Bonnell ([33]UMCP) NASA Official: Phillip Newman [34]Specific rights apply. [35]NASA Web Privacy Policy and Important Notices A service of: [36]ASD at [37]NASA / [38]GSFC & [39]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://apod.nasa.gov/apod/image/2010/m42HSO_gonzalez_2000.jpg 3. mailto:%20cesina%20@at@%20Hotmail%20.dot.%20com 4. https://apod.nasa.gov/apod/ap130320.html 5. https://en.wikipedia.org/wiki/Molecular_cloud 6. https://en.wikipedia.org/wiki/Shock_waves 7. https://chandra.harvard.edu/photo/cosmic_distance.html 8. http://www.atlasoftheuniverse.com/5000lys.html 9. https://solarsystem.nasa.gov/solar-system/sun/in-depth/ 10. https://apod.nasa.gov/apod/ap121203.html 11. https://apod.nasa.gov/apod/ap110121.html 12. https://c8.alamy.com/comp/T0C5NX/three-cats-in-a-row-isolated-on-white-white-cat-with-heterochromia-black-and-orange-cats-T0C5NX.jpg 13. https://periodic.lanl.gov/1.shtml 14. https://periodic.lanl.gov/8.shtml 15. https://periodic.lanl.gov/16.shtml 16. https://apod.nasa.gov/apod/ap101023.html 17. https://apod.nasa.gov/apod/ap120212.html 18. https://apod.nasa.gov/apod/ap130422.html 19. https://apod.nasa.gov/apod/ap201003.html 20. https://apod.nasa.gov/apod/archivepix.html 21. https://apod.nasa.gov/apod/lib/apsubmit2015.html 22. https://apod.nasa.gov/apod/lib/aptree.html 23. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 24. https://apod.nasa.gov/apod/calendar/allyears.html 25. https://apod.nasa.gov/apod.rss 26. https://apod.nasa.gov/apod/lib/edlinks.html 27. https://apod.nasa.gov/apod/lib/about_apod.html 28. http://asterisk.apod.com/discuss_apod.php?date=201004 29. https://apod.nasa.gov/apod/ap201005.html 30. http://www.phy.mtu.edu/faculty/Nemiroff.html 31. http://www.phy.mtu.edu/ 32. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 33. http://www.astro.umd.edu/ 34. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 35. https://www.nasa.gov/about/highlights/HP_Privacy.html 36. https://astrophysics.gsfc.nasa.gov/ 37. https://www.nasa.gov/ 38. https://www.nasa.gov/centers/goddard/ 39. http://www.mtu.edu/