¿ 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 July 26 IFRAME: [2]https://www.youtube.com/embed/PDMp8a-YNe0?rel=0 A Flight through the Hubble Ultra Deep Field Video Credit: [3]NASA, [4]ESA, F. Summers, Z. Levay, L. Frattare, B. Mobasher, A. Koekemoer and the HUDF Team ([5]STScI) Explanation: What would it look like to fly through the distant universe? To find out, a team of astronomers estimated the relative distances to over 5,000 galaxies in one of the most distant fields of galaxies ever imaged: the [6]Hubble Ultra Deep Field ([7]HUDF). Because it takes light a long time to cross the universe, most galaxies visible in the [8]featured video are seen when the universe was only a fraction of its current age, were [9]still forming, and have unusual shapes when compared to modern galaxies. No mature looking spiral galaxies such as our [10]Milky Way or the [11]Andromeda galaxy yet exist. Toward the end of the video the [12]virtual observer flies past the [13]farthest galaxies in the [14]HUDF field, recorded to have a [15]redshift past 8. This [16]early class of low luminosity [17]galaxies likely contained [18]energetic stars emitting light that [19]transformed much of the remaining [20]normal matter in the universe from a cold gas to a hot ionized [21]plasma. Astrophysicists: [22]Browse 2,200+ codes in the Astrophysics Source Code Library Tomorrow's picture: mountain, comet, lightning __________________________________________________________________ [23]< | [24]Archive | [25]Submissions | [26]Index | [27]Search | [28]Calendar | [29]RSS | [30]Education | [31]About APOD | [32]Discuss | [33]> __________________________________________________________________ Authors & editors: [34]Robert Nemiroff ([35]MTU) & [36]Jerry Bonnell ([37]UMCP) NASA Official: Phillip Newman [38]Specific rights apply. [39]NASA Web Privacy Policy and Important Notices A service of: [40]ASD at [41]NASA / [42]GSFC & [43]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://www.youtube.com/embed/PDMp8a-YNe0?rel=0 3. https://nasa.gov/ 4. https://spacetelescope.org/ 5. https://stsci.edu/ 6. https://www.spacetelescope.org/images/heic0611b/ 7. https://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Field 8. https://www.youtube.com/watch?v=PDMp8a-YNe0 9. https://hubblesite.org/newscenter/archive/releases/2004/28/video/b/ 10. https://apod.nasa.gov/apod/ap050104.html 11. https://apod.nasa.gov/apod/ap130626.html 12. https://apod.nasa.gov/apod/ap120813.html 13. https://www.spacetelescope.org/science/deep_fields/ 14. https://apod.nasa.gov/apod/ap040929.html 15. https://apod.nasa.gov/apod/ap130408.html 16. https://arxiv.org/abs/0909.1806 17. https://hubblesite.org/newscenter/archive/releases/2004/28/text/ 18. https://apod.nasa.gov/apod/ap030610.html 19. https://www.kicc.cam.ac.uk/research/RTreionization 20. https://apod.nasa.gov/apod/ap020820.html 21. https://en.wikipedia.org/wiki/Plasma_(physics) 22. http://ascl.net/ 23. https://apod.nasa.gov/apod/ap200725.html 24. https://apod.nasa.gov/apod/archivepix.html 25. https://apod.nasa.gov/apod/lib/apsubmit2015.html 26. https://apod.nasa.gov/apod/lib/aptree.html 27. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 28. https://apod.nasa.gov/apod/calendar/allyears.html 29. https://apod.nasa.gov/apod.rss 30. https://apod.nasa.gov/apod/lib/edlinks.html 31. https://apod.nasa.gov/apod/lib/about_apod.html 32. http://asterisk.apod.com/discuss_apod.php?date=200726 33. https://apod.nasa.gov/apod/ap200727.html 34. http://www.phy.mtu.edu/faculty/Nemiroff.html 35. http://www.phy.mtu.edu/ 36. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 37. http://www.astro.umd.edu/ 38. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 39. https://www.nasa.gov/about/highlights/HP_Privacy.html 40. https://astrophysics.gsfc.nasa.gov/ 41. https://www.nasa.gov/ 42. https://www.nasa.gov/centers/goddard/ 43. http://www.mtu.edu/