¿ 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 9 [2]A picture of both the Horsehead and Orion Nebulas. Please see the explanation for more detailed information. Horsehead and Orion Nebulas Image Credit & Copyright: [3]Roberto Colombari & Federico Pelliccia Explanation: The dark [4]Horsehead Nebula and the glowing [5]Orion Nebula are contrasting cosmic vistas. Adrift 1,500 light-years away in one of [6]the night sky's most recognizable [7]constellations, they appear in opposite corners of the above [8]stunning mosaic. The familiar [9]Horsehead nebula appears as a dark cloud, a [10]small silhouette notched against the long red glow at the lower left. [11]Alnitak is the easternmost star in [12]Orion's belt and is seen as the brightest [13]star to the left of the [14]Horsehead. Below Alnitak is the [15]Flame Nebula, with clouds of bright emission and [16]dramatic dark dust lanes. The magnificent emission region, the [17]Orion Nebula (aka M42), lies at the upper right. Immediately to its left is a prominent [18]reflection nebula sometimes called the Running Man. Pervasive [19]tendrils of glowing hydrogen gas are easily [20]traced throughout the region. Astrophysicists: [21]Browse 2,500+ codes in the Astrophysics Source Code Library Tomorrow's picture: star clusters near and far __________________________________________________________________ [22]< | [23]Archive | [24]Submissions | [25]Index | [26]Search | [27]Calendar | [28]RSS | [29]Education | [30]About APOD | [31]Discuss | [32]> __________________________________________________________________ Authors & editors: [33]Robert Nemiroff ([34]MTU) & [35]Jerry Bonnell ([36]UMCP) NASA Official: Phillip Newman [37]Specific rights apply. [38]NASA Web Privacy Policy and Important Notices A service of: [39]ASD at [40]NASA / [41]GSFC & [42]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://apod.nasa.gov/apod/image/2105/orionwisps_colombari_3543.jpg 3. https://www.astrobin.com/users/rob77/ 4. https://apod.nasa.gov/apod/ap081126.html 5. https://apod.nasa.gov/apod/ap090826.html 6. https://apod.nasa.gov/apod/ap030207.html 7. https://en.wikipedia.org/wiki/Constellation 8. http://www.astrobin.com/60227/0/ 9. https://en.wikipedia.org/wiki/Horsehead_Nebula 10. https://i.redd.it/9lmbxkkm9bm41.jpg 11. https://www.gb.nrao.edu/~rmaddale/Education/OrionTourCenter/belt.html 12. https://apod.nasa.gov/apod/ap090210.html 13. https://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve 14. https://www.liveabout.com/horse-head-drawing-step-by-step-tutorial-1123322 15. https://apod.nasa.gov/apod/ap070202.html 16. https://apod.nasa.gov/apod/ap090929.html 17. https://en.wikipedia.org/wiki/Orion_nebula 18. http://antwrp.gsfc.nasa.gov/apod/reflection_nebulae.html 19. https://apod.nasa.gov/apod/ap090224.html 20. https://youtu.be/-PQpNb_yJVE 21. http://ascl.net/ 22. https://apod.nasa.gov/apod/ap210508.html 23. https://apod.nasa.gov/apod/archivepix.html 24. https://apod.nasa.gov/apod/lib/apsubmit2015.html 25. https://apod.nasa.gov/apod/lib/aptree.html 26. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 27. https://apod.nasa.gov/apod/calendar/allyears.html 28. https://apod.nasa.gov/apod.rss 29. https://apod.nasa.gov/apod/lib/edlinks.html 30. https://apod.nasa.gov/apod/lib/about_apod.html 31. http://asterisk.apod.com/discuss_apod.php?date=210509 32. https://apod.nasa.gov/apod/ap210510.html 33. http://www.phy.mtu.edu/faculty/Nemiroff.html 34. http://www.phy.mtu.edu/ 35. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 36. http://www.astro.umd.edu/ 37. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 38. https://www.nasa.gov/about/highlights/HP_Privacy.html 39. https://astrophysics.gsfc.nasa.gov/ 40. https://www.nasa.gov/ 41. https://www.nasa.gov/centers/goddard/ 42. http://www.mtu.edu/