¿ 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 February 9 IFRAME: [2]https://www.youtube.com/embed/4on-e614tag?rel=0 Flashes of the Crab Pulsar Video Credit & Copyright: [3]Martin Fiedler Explanation: It somehow survived an explosion that would surely have destroyed our Sun. Now it is spins 30 times a second and is famous for the its rapid flashes. It is the [4]Crab Pulsar, the rotating [5]neutron star remnant of the supernova that created the [6]Crab Nebula. A careful eye can spot the pulsar flashes in the [7]featured time-lapse video, just above the image center. The video was created by adding together images taken only when the pulsar was flashing, as well as co-added images from other relative times. The Crab Pulsar flashes may have been [8]first noted by an unknown woman attending a [9]public observing night at the University of Chicago in 1957 -- but who was not believed. The [10]progenitor supernova explosion was seen by many in the year 1054 AD. The expanding Crab Nebula remains a [11]picturesque [12]expanding gas cloud that [13]glows across the [14]electromagnetic spectrum. The pulsar is now thought to have survived the supernova explosion because it is composed of extremely-dense [15]quantum-degenerate matter. Tomorrow's picture: lasing space __________________________________________________________________ [16]< | [17]Archive | [18]Submissions | [19]Index | [20]Search | [21]Calendar | [22]RSS | [23]Education | [24]About APOD | [25]Discuss | [26]> __________________________________________________________________ Authors & editors: [27]Robert Nemiroff ([28]MTU) & [29]Jerry Bonnell ([30]UMCP) NASA Official: Phillip Newman [31]Specific rights apply. [32]NASA Web Privacy Policy and Important Notices A service of: [33]ASD at [34]NASA / [35]GSFC & [36]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://www.youtube.com/embed/4on-e614tag?rel=0 3. mailto:%20martin%20.dot.%20fiedler%20@at@%20mail%20.dot.%20de 4. https://en.wikipedia.org/wiki/Crab_Pulsar 5. https://www.nasa.gov/mission_pages/GLAST/science/neutron_stars.html 6. https://apod.nasa.gov/apod/ap200906.html 7. https://youtu.be/4on-e614tag 8. https://pos.sissa.it/099/014/pdf 9. https://nightsky.jpl.nasa.gov/event-list.cfm 10. https://earthsky.org/clusters-nebulae-galaxies/crab-nebula-was-an-exploding-star 11. https://apod.nasa.gov/apod/ap160708.html 12. https://www.astrobin.com/full/327338/0/ 13. https://youtu.be/yf3Jd51pnuk 14. https://science.nasa.gov/ems/01_intro 15. https://en.wikipedia.org/wiki/Degenerate_matter 16. https://apod.nasa.gov/apod/ap210208.html 17. https://apod.nasa.gov/apod/archivepix.html 18. https://apod.nasa.gov/apod/lib/apsubmit2015.html 19. https://apod.nasa.gov/apod/lib/aptree.html 20. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 21. https://apod.nasa.gov/apod/calendar/allyears.html 22. https://apod.nasa.gov/apod.rss 23. https://apod.nasa.gov/apod/lib/edlinks.html 24. https://apod.nasa.gov/apod/lib/about_apod.html 25. http://asterisk.apod.com/discuss_apod.php?date=210209 26. https://apod.nasa.gov/apod/ap210210.html 27. http://www.phy.mtu.edu/faculty/Nemiroff.html 28. http://www.phy.mtu.edu/ 29. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 30. http://www.astro.umd.edu/ 31. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 32. https://www.nasa.gov/about/highlights/HP_Privacy.html 33. https://astrophysics.gsfc.nasa.gov/ 34. https://www.nasa.gov/ 35. https://www.nasa.gov/centers/goddard/ 36. http://www.mtu.edu/