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. 2022 November 15 [2]The featured image shows a long stretch of brown dust ending in a blue glow. Along the right a gas filament glows in red. Please see the explanation for more detailed information. Wolf's Cave Nebula Image Credit & Copyright: [3]Gianni Lacroce Explanation: [4]The mysterious blue reflection nebula found in catalogs as [5]VdB 152 or Ced 201 really is very faint. It lies at the tip of the long [6]dark nebula Barnard 175 in a dusty complex that has also been called [7]Wolf's Cave. At the center of [8]this deep telescopic view, the [9]cosmic apparitions are nearly 1,400 [10]light-years away along the northern Milky Way in the [11]royal constellation Cepheus. [12]Interstellar dust in the region [13]blocks light from background stars and [14]scatters light from the embedded bright star, giving the end nebula its characteristic blue color. Though [15]stars do form in [16]molecular clouds, this star seems to have only accidentally wandered into the area, as its measured velocity through space is very different from the cloud's velocity. At [17]the image bottom is the planetary nebula [18]Dengel-Hartl 5, while red glowing gas from an ancient supernova remnant is [19]also visible along the image's right side. Tomorrow's picture: open space __________________________________________________________________ [20]< | [21]Archive | [22]Submissions | [23]Index | [24]Search | [25]Calendar | [26]RSS | [27]Education | [28]About APOD | [29]Discuss | [30]> __________________________________________________________________ Authors & editors: [31]Robert Nemiroff ([32]MTU) & [33]Jerry Bonnell ([34]UMCP) NASA Official: Phillip Newman [35]Specific rights apply. [36]NASA Web Privacy Policy and Important Notices A service of: [37]ASD at [38]NASA / [39]GSFC, [40]NASA Science Activation & [41]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://apod.nasa.gov/apod/image/2211/WolfsCave_Lacroce_3053.jpg 3. https://www.flickr.com/photos/194921065@N03/ 4. https://ui.adsabs.harvard.edu/abs/1908MNRAS..69..117W/abstract 5. https://noirlab.edu/public/images/noao-vdb152/ 6. https://apod.nasa.gov/apod/ap090425.html 7. http://bf-astro.com/vdB152/vdB152.htm 8. https://www.flickr.com/photos/194921065@N03/52425057847/in/pool-apods/ 9. https://apod.nasa.gov/ap201026.html 10. https://exoplanets.nasa.gov/faq/26/what-is-a-light-year/ 11. https://earthsky.org/sky-archive/constellation-cepheus-looks-like-a-house 12. https://curator.jsc.nasa.gov/stardust/interstellardust.cfm 13. https://apod.nasa.gov/apod/ap201122.html 14. https://en.wikipedia.org/wiki/Reflection_nebula 15. https://coolcosmos.ipac.caltech.edu/infrared_gallery/4 16. https://en.wikipedia.org/wiki/Molecular_cloud 17. https://www.astrobin.com/bxbmqc/ 18. https://astrodonimaging.com/gallery/dengel-hartl-5-in-cepheus/ 19. http://bf-astro.com/vdB152/vdB152.htm 20. https://apod.nasa.gov/apod/ap221114.html 21. https://apod.nasa.gov/apod/archivepix.html 22. https://apod.nasa.gov/apod/lib/apsubmit2015.html 23. https://apod.nasa.gov/apod/lib/aptree.html 24. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 25. https://apod.nasa.gov/apod/calendar/allyears.html 26. https://apod.nasa.gov/apod.rss 27. https://apod.nasa.gov/apod/lib/edlinks.html 28. https://apod.nasa.gov/apod/lib/about_apod.html 29. http://asterisk.apod.com/discuss_apod.php?date=221115 30. https://apod.nasa.gov/apod/ap221116.html 31. http://www.phy.mtu.edu/faculty/Nemiroff.html 32. http://www.phy.mtu.edu/ 33. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 34. http://www.astro.umd.edu/ 35. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 36. https://www.nasa.gov/about/highlights/HP_Privacy.html 37. https://astrophysics.gsfc.nasa.gov/ 38. https://www.nasa.gov/ 39. https://www.nasa.gov/centers/goddard/ 40. https://science.nasa.gov/learners 41. http://www.mtu.edu/