¿ 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 June 23 [2]See Explanation. Moving the cursor over the image will bring up an annotated version. Clicking on the image will bring up the highest resolution version available. The X-Ray Sky from eROSITA Image Credit & Copyright: J. Sanders, H. Brunner, A. Merloni & eSASS [3]Team ([4]MPE); E. Churazov, M. Gilfanov, R. Sunyaev ([5]IKI) Explanation: What if you could see X-rays? The night sky would seem a strange and unfamiliar place. [6]X-rays are about 1,000 times more energetic than [7]visible light photons and are produced by [8]violent explosions and high temperature astronomical environments. Instead of the familiar steady stars, the [9]sky would seem to be [10]filled with exotic stars, active galaxies, and hot supernova remnants. The [11]featured X-ray image captures in [12]unprecedented detail the entire sky in X-rays as seen by the [13]eROSITA telescope onboard [14]Spektr-RG satellite, orbiting around the [15]L2 point of the Sun-Earth system, [16]launched last year. The image shows the plane of our Milky Way galaxy across the center, a diffuse and pervasive [17]X-ray background, the hot [18]interstellar bubble known as the [19]North Polar Spur, sizzling supernova remnants such as [20]Vela, the [21]Cygnus Loop and [22]Cas A, energetic binary stars including [23]Cyg X-1 and Cyg X-2, the [24]LMC galaxy, and the [25]Coma, [26]Virgo, and [27]Fornax clusters of galaxies. This first sky scan by [28]eROSITA located over one million X-ray sources, some of which are not understood and will surely be topics for future research. Tomorrow's picture: inverted cloud city __________________________________________________________________ [29]< | [30]Archive | [31]Submissions | [32]Index | [33]Search | [34]Calendar | [35]RSS | [36]Education | [37]About APOD | [38]Discuss | [39]> __________________________________________________________________ Authors & editors: [40]Robert Nemiroff ([41]MTU) & [42]Jerry Bonnell ([43]UMCP) NASA Official: Phillip Newman [44]Specific rights apply. [45]NASA Web Privacy Policy and Important Notices A service of: [46]ASD at [47]NASA / [48]GSFC & [49]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://apod.nasa.gov/apod/image/2006/SkyMapB_eROSITA_2998.jpg 3. https://www.mpe.mpg.de/455845/personnel 4. https://erosita.mpe.mpg.de/ 5. http://www.iki.rssi.ru/eng/ 6. https://science.nasa.gov/ems/11_xrays 7. https://science.nasa.gov/ems/09_visiblelight 8. https://www.youtube.com/watch?v=a8mKIDIGXq0 9. https://apod.nasa.gov/apod/ap960102.html 10. https://apod.nasa.gov/apod/ap000819.html 11. http://www.mpe.mpg.de/7461950/erass1-presskit 12. https://i.ytimg.com/vi/6-nZrMFUh9k/hqdefault.jpg 13. https://www.mpe.mpg.de/eROSITA 14. https://en.wikipedia.org/wiki/Spektr-RG 15. https://solarsystem.nasa.gov/resources/754/what-is-a-lagrange-point/ 16. https://youtu.be/LfHH6oX1VQg?t=41 17. https://en.wikipedia.org/wiki/X-ray_background 18. https://apod.nasa.gov/apod/ap990503.html 19. https://heasarc.gsfc.nasa.gov/docs/rosat/gallery/misc_nps.html 20. https://apod.nasa.gov/apod/ap190110.html 21. https://apod.nasa.gov/apod/ap010623.html 22. https://apod.nasa.gov/apod/ap020824.html 23. https://apod.nasa.gov/apod/ap080811.html 24. https://en.wikipedia.org/wiki/Large_Magellanic_Cloud 25. https://apod.nasa.gov/apod/ap180326.html 26. https://apod.nasa.gov/apod/ap150804.html 27. https://apod.nasa.gov/apod/ap160611.html 28. http://www.mpe.mpg.de/7362694/presskit-erosita-firstlight 29. https://apod.nasa.gov/apod/ap200622.html 30. https://apod.nasa.gov/apod/archivepix.html 31. https://apod.nasa.gov/apod/lib/apsubmit2015.html 32. https://apod.nasa.gov/apod/lib/aptree.html 33. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 34. https://apod.nasa.gov/apod/calendar/allyears.html 35. https://apod.nasa.gov/apod.rss 36. https://apod.nasa.gov/apod/lib/edlinks.html 37. https://apod.nasa.gov/apod/lib/about_apod.html 38. http://asterisk.apod.com/discuss_apod.php?date=200623 39. https://apod.nasa.gov/apod/ap200624.html 40. http://www.phy.mtu.edu/faculty/Nemiroff.html 41. http://www.phy.mtu.edu/ 42. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 43. http://www.astro.umd.edu/ 44. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 45. https://www.nasa.gov/about/highlights/HP_Privacy.html 46. https://astrophysics.gsfc.nasa.gov/ 47. https://www.nasa.gov/ 48. https://www.nasa.gov/centers/goddard/ 49. http://www.mtu.edu/