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. 2024 September 27 [2]See Explanation. Clicking on the picture will download the highest resolution version available. Stellar Streams in the Local Universe Image Credit: [3]David Martinez Delgado et al. Explanation: [4]The twenty galaxies arrayed in these panels are part of an ambitious astronomical survey of tidal stellar streams. Each panel presents a composite view; a deep, inverted image taken from publicly [5]available imaging surveys of a field that surrounds a [6]nearby massive galaxy image. The inverted images reveal faint cosmic structures, star streams hundreds of thousands of light-years across, that result from the gravitational disruption and [7]eventual merger of satellite galaxies in the [8]local universe. Such surveys of mergers and gravitational tidal interactions between massive galaxies and their dwarf satellites are [9]crucial guides for current models of galaxy formation and cosmology. Of course, the detection of stellar streams in the neighboring Andromeda Galaxy and [10]our own Milky Way also offers spectacular evidence for ongoing satellite galaxy disruption within our more [11]local galaxy group. Tomorrow's picture: eclipse at sunset __________________________________________________________________ [12]< | [13]Archive | [14]Submissions | [15]Index | [16]Search | [17]Calendar | [18]RSS | [19]Education | [20]About APOD | [21]Discuss | [22]> __________________________________________________________________ Authors & editors: [23]Robert Nemiroff ([24]MTU) & [25]Jerry Bonnell ([26]UMCP) NASA Official: Phillip Newman [27]Specific rights apply. [28]NASA Web Privacy Policy and Important Notices A service of: [29]ASD at [30]NASA / [31]GSFC, [32]NASA Science Activation & [33]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://apod.nasa.gov/apod/image/2409/SSSGreatestHits.png 3. https://www.aanda.org/articles/aa/abs/2023/03/aa45011-22/aa45011-22.html 4. https://ui.adsabs.harvard.edu/abs/2023A&A...671A.141M/abstract 5. https://ui.adsabs.harvard.edu/abs/2019AJ....157..168D/abstract 6. https://apod.nasa.gov/apod/ap240703.html 7. https://apod.nasa.gov/apod/ap191116.html 8. https://www.astro.wisc.edu/research/research-areas/extragalactic-astronomy-and-cosmology/local-universe/ 9. https://arxiv.org/abs/2409.03585 10. https://apod.nasa.gov/apod/ap130815.html 11. https://imagine.gsfc.nasa.gov/features/cosmic/local_group_info.html 12. https://apod.nasa.gov/apod/ap240926.html 13. https://apod.nasa.gov/apod/archivepix.html 14. https://apod.nasa.gov/apod/lib/apsubmit2015.html 15. https://apod.nasa.gov/apod/lib/aptree.html 16. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 17. https://apod.nasa.gov/apod/calendar/allyears.html 18. https://apod.nasa.gov/apod.rss 19. https://apod.nasa.gov/apod/lib/edlinks.html 20. https://apod.nasa.gov/apod/lib/about_apod.html 21. http://asterisk.apod.com/discuss_apod.php?date=240927 22. https://apod.nasa.gov/apod/ap240928.html 23. http://www.phy.mtu.edu/faculty/Nemiroff.html 24. http://www.phy.mtu.edu/ 25. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 26. http://www.astro.umd.edu/ 27. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 28. https://www.nasa.gov/about/highlights/HP_Privacy.html 29. https://astrophysics.gsfc.nasa.gov/ 30. https://www.nasa.gov/ 31. https://www.nasa.gov/centers/goddard/ 32. https://science.nasa.gov/learners 33. http://www.mtu.edu/