¿ 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 May 6 [2]See Explanation. Clicking on the picture will download the highest resolution version available. LDN 1471: A Windblown Star Cavity Image Credit: [3]Hubble, [4]NASA, [5]ESA; Processing & [6]License: [7]Judy Schmidt Explanation: What is the cause of this unusual parabolic structure? This illuminated cavity, known as [8]LDN 1471, was created by a newly forming [9]star, seen as the bright source at the peak of the [10]parabola. This [11]protostar is experiencing a [12]stellar outflow which is then interacting with the surrounding material in the [13]Perseus Molecular Cloud, causing it to brighten. We see only one side of the cavity -- the other side is hidden by dark [14]dust. The [15]parabolic shape is caused by the widening of the [16]stellar-wind blown cavity over time. Two additional structures can also be seen either side of the [17]protostar, these are known as [18]Herbig-Haro objects, again caused by the interaction of the outflow with the surrounding material. What causes the [19]striations on the cavity walls, though, [20]remains unknown. The [21]featured image was taken by NASA and ESA's [22]Hubble Space Telescope after an original detection by the [23]Spitzer Space Telescope. Tomorrow's picture: open space __________________________________________________________________ [24]< | [25]Archive | [26]Submissions | [27]Index | [28]Search | [29]Calendar | [30]RSS | [31]Education | [32]About APOD | [33]Discuss | [34]> __________________________________________________________________ Authors & editors: [35]Robert Nemiroff ([36]MTU) & [37]Jerry Bonnell ([38]UMCP) NASA Official: Phillip Newman [39]Specific rights apply. [40]NASA Web Privacy Policy and Important Notices A service of: [41]ASD at [42]NASA / [43]GSFC & [44]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://apod.nasa.gov/apod/image/2005/LDN1471_HubbleSchmidt_1024.jpg 3. https://hla.stsci.edu/ 4. https://www.nasa.gov/ 5. https://www.esa.int/ 6. https://creativecommons.org/licenses/by/2.0/ 7. https://geckzilla.com/ 8. https://heasarc.gsfc.nasa.gov/W3Browse/nebula-catalog/ldn.html 9. https://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve 10. https://en.wikipedia.org/wiki/Parabola 11. https://en.wikipedia.org/wiki/Protostar 12. https://www.annualreviews.org/doi/abs/10.1146/annurev-astro-081915-023341 13. https://en.wikipedia.org/wiki/Perseus_molecular_cloud 14. http://coolcosmos.ipac.caltech.edu/cosmic_classroom/cosmic_reference/dust.html 15. https://www.mathwarehouse.com/quadratic/parabola/interactive-parabola.php 16. https://apod.nasa.gov/apod/ap200308.html 17. https://apod.nasa.gov/apod/ap130904.html 18. https://en.wikipedia.org/wiki/Herbig%E2%80%93Haro_object 19. https://en.wiktionary.org/wiki/striation#/media/File:Striation_II_(3770181363).jpg 20. https://mk0tdb1b9oe2980rm.kinstacdn.com/wp-content/uploads/images/library/puzzleddog.jpg 21. https://www.flickr.com/photos/geckzilla/48507562636/in/dateposted/ 22. https://www.nasa.gov/mission_pages/hubble/main/index.html 23. http://www.spitzer.caltech.edu/mission/32-The-Mission 24. https://apod.nasa.gov/apod/ap200505.html 25. https://apod.nasa.gov/apod/archivepix.html 26. https://apod.nasa.gov/apod/lib/apsubmit2015.html 27. https://apod.nasa.gov/apod/lib/aptree.html 28. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 29. https://apod.nasa.gov/apod/calendar/allyears.html 30. https://apod.nasa.gov/apod.rss 31. https://apod.nasa.gov/apod/lib/edlinks.html 32. https://apod.nasa.gov/apod/lib/about_apod.html 33. http://asterisk.apod.com/discuss_apod.php?date=200506 34. https://apod.nasa.gov/apod/ap200507.html 35. http://www.phy.mtu.edu/faculty/Nemiroff.html 36. http://www.phy.mtu.edu/ 37. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 38. http://www.astro.umd.edu/ 39. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 40. https://www.nasa.gov/about/highlights/HP_Privacy.html 41. https://astrophysics.gsfc.nasa.gov/ 42. https://www.nasa.gov/ 43. https://www.nasa.gov/centers/goddard/ 44. http://www.mtu.edu/