¿ 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 March 15 IFRAME: [2]https://www.youtube.com/embed/WJua8eXLX9o?rel=0 Meteor Fireballs in Light and Sound Image Credit & Copyright: [3]Thomas Ashcraft ([4]Radio Fireball Observatory) Explanation: Yes, but have you ever heard a meteor? Usually, meteors are [5]too far away to make any audible sound. However, a [6]meteor will briefly create an [7]ionization trail that can reflect a distant radio signal. If the geometry is right, you may [8]momentarily hear -- through your radio -- a distant radio station even over [9]static. In the [10]featured video, the sounds of distant radio transmitters were caught reflecting from large meteor trails by a sensitive radio receiver -- at the same time the [11]bright streaks were captured by an [12]all-sky video camera. In the video, the [13]bright [14]paths taken by four [15]fireballs across the sky near [16]Lamy, [17]New Mexico, [18]USA, are shown first. Next, after each static frame, a real-time video captures each [19]meteor streaking across the sky, now paired with the sound recorded from its radio reflection. Projecting a meteor trail down to the [20]Earth may lead to finding its [21]impact site (if any), while projecting its [22]trail back into the sky may lead to identifying its [23]parent comet or asteroid. Almost Hyperspace: [24]Random APOD Generator Tomorrow's picture: astro dust __________________________________________________________________ [25]< | [26]Archive | [27]Submissions | [28]Index | [29]Search | [30]Calendar | [31]RSS | [32]Education | [33]About APOD | [34]Discuss | [35]> __________________________________________________________________ Authors & editors: [36]Robert Nemiroff ([37]MTU) & [38]Jerry Bonnell ([39]UMCP) NASA Official: Phillip Newman [40]Specific rights apply. [41]NASA Web Privacy Policy and Important Notices A service of: [42]ASD at [43]NASA / [44]GSFC & [45]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://www.youtube.com/embed/WJua8eXLX9o?rel=0 3. mailto:%20ashcraft%20@at@%20heliotown%20.dot.%20com 4. http://www.heliotown.com/ 5. https://earthsky.org/space/whoosh-can-you-hear-a-meteor-streak-past 6. https://solarsystem.nasa.gov/asteroids-comets-and-meteors/meteors-and-meteorites/overview/ 7. https://en.wikipedia.org/wiki/Meteor_burst_communications 8. https://i.pinimg.com/originals/f3/aa/fd/f3aafd5b31e81165473be45d67383a33.jpg 9. https://www.scientificamerican.com/article/cosmic-radio-background/ 10. http://www.heliotown.com/Fireballs.html 11. https://apod.nasa.gov/apod/ap011119.html 12. https://apod.nasa.gov/apod/ap090817.html 13. https://apod.nasa.gov/apod/ap130218.html 14. https://apod.nasa.gov/apod/ap110123.html 15. https://apod.nasa.gov/apod/ap990219.html 16. https://en.wikipedia.org/wiki/Lamy,_New_Mexico 17. https://youtu.be/unghDml5F_4 18. https://www.cia.gov/the-world-factbook/countries/united-states/ 19. https://apod.nasa.gov/apod/ap200912.html 20. https://solarsystem.nasa.gov/planets/earth/overview/ 21. https://apod.nasa.gov/apod/ap090328.html 22. https://www.discovermagazine.com/the-sciences/meteor-hunters-track-fireballs-in-the-night-sky 23. https://apod.nasa.gov/apod/ap180808.html 24. https://apod.nasa.gov/apod/random_apod.html 25. https://apod.nasa.gov/apod/ap210314.html 26. https://apod.nasa.gov/apod/archivepix.html 27. https://apod.nasa.gov/apod/lib/apsubmit2015.html 28. https://apod.nasa.gov/apod/lib/aptree.html 29. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 30. https://apod.nasa.gov/apod/calendar/allyears.html 31. https://apod.nasa.gov/apod.rss 32. https://apod.nasa.gov/apod/lib/edlinks.html 33. https://apod.nasa.gov/apod/lib/about_apod.html 34. http://asterisk.apod.com/discuss_apod.php?date=210315 35. https://apod.nasa.gov/apod/ap210316.html 36. http://www.phy.mtu.edu/faculty/Nemiroff.html 37. http://www.phy.mtu.edu/ 38. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 39. http://www.astro.umd.edu/ 40. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 41. https://www.nasa.gov/about/highlights/HP_Privacy.html 42. https://astrophysics.gsfc.nasa.gov/ 43. https://www.nasa.gov/ 44. https://www.nasa.gov/centers/goddard/ 45. http://www.mtu.edu/