﻿ 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 July 14 IFRAME: [2]https://www.youtube.com/embed/V_Kd4YBNs7c?rel=0 GW200115: Simulation of a Black Hole Merging with a Neutron Star Video Credit: Simulation: [3]S.V. Chaurasia ([4]Stockholm U.), [5]T. Dietrich ([6]Potsdam U. & [7]MPIGP); Visualization: [8]T. Dietrich ([9]Potsdam U. & [10]MPIGP), [11]N. Fischer, [12]S. Ossokine, [13]H. Pfeiffer ([14]MPIGP) Explanation: What happens when a black hole destroys a neutron star? Analyses indicate that just such an event created gravitational wave event [15]GW200115, detected in 2020 January by [16]LIGO and [17]Virgo observatories. To better understand the unusual event, the [18]featured visualization was created from a computer simulation. The visualization video starts with the [19]black hole (about 6 times the Sun's mass) and [20]neutron star (about 1.5 times the Sun's mass) circling each other, together emitting an increasing amount of [21]gravitational radiation. The picturesque pattern of [22]gravitational wave emission is shown in blue. The duo [23]spiral together increasingly fast until the neutron star becomes completely absorbed by the [24]black hole. Since the neutron star did not break apart during [25]the collision, little light escaped -- which matches the lack of an observed optical counterpart. The remaining black hole [26]rings briefly, and as that dies down so do the emitted gravitational waves. The 30-second [27]time-lapse video may seem short, but it actually lasts about 1000 times longer than the real merger event. Astrophysicists: [28]Browse 2,500+ codes in the Astrophysics Source Code Library Tomorrow's picture: open space __________________________________________________________________ [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://www.youtube.com/embed/V_Kd4YBNs7c?rel=0 3. https://www.su.se/english/profiles/swch0281-1.484276 4. https://www.su.se/english/ 5. https://www.aei.mpg.de/person/45262/2784 6. https://www.uni-potsdam.de/en/theoretical-astrophysics/ 7. https://www.aei.mpg.de/ 8. https://www.aei.mpg.de/person/45262/2784 9. https://www.uni-potsdam.de/en/theoretical-astrophysics/ 10. https://www.aei.mpg.de/ 11. https://www.aei.mpg.de/person/59640/2784 12. https://www.aei.mpg.de/person/44382/2784 13. https://www.aei.mpg.de/person/54205/2784 14. https://www.aei.mpg.de/ 15. https://www.ligo.org/detections/NSBH2020.php 16. https://www.ligo.org/about.php 17. http://public.virgo-gw.eu/the-virgo-collaboration/ 18. https://www.aei.mpg.de/726542/gw200105-gw200115 19. https://science.nasa.gov/astrophysics/focus-areas/black-holes 20. https://imagine.gsfc.nasa.gov/science/objects/neutron_stars1.html 21. https://en.wikipedia.org/wiki/Gravitational_wave 22. https://spaceplace.nasa.gov/gravitational-waves/en/ 23. https://static.boredpanda.com/blog/wp-content/uploads/2016/11/black-white-cats-yin-yang-70-5824837231803__605.jpg 24. https://apod.nasa.gov/htmltest/rjn_bht.html 25. https://apod.nasa.gov/apod/ap190903.html 26. https://apod.nasa.gov/apod/ap160211.html 27. https://youtu.be/V_Kd4YBNs7c 28. http://ascl.net/ 29. https://apod.nasa.gov/apod/ap210713.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=210714 39. https://apod.nasa.gov/apod/ap210715.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/