New article on Inoreader

http://www.youtube.com/user/scishowspaceThe Key to Finding Life Elsewhere in the Universe: Purple Planets?!? -

Some scientists believe that 3.6 billion years ago Earth might have been purple, and that theory is giving us some clues in our search for life in the universe.

SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at http://www.scishowtangents.org
----------
Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow
----------
Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever:

Kevin Bealer, Jacob, Katie Marie Magnone, D.A. Noe, Charles Southerland, Eric Jensen, Christopher R Boucher, Alex Hackman, Matt Curls, Adam Brainard, Scott Satovsky Jr, Sam Buck, Ron Kakar, Chris Peters, Kevin Carpentier, Patrick D. Ashmore, Piya Shedden, Sam Lutfi, Charles George, Christoph Schwanke, Greg

----------
Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow
----------
Looking for SciShow elsewhere on the internet?
Facebook: http://www.facebook.com/scishow
Twitter: http://www.twitter.com/scishow
Tumblr: http://scishow.tumblr.com
Instagram: http://instagram.com/thescishow
----------
Sources:

https://doi.org/10.1088/2041-8205/728/1/L6
https://www.ncbi.nlm.nih.gov/books/NBK22535/
https://doi.org/10.3390/sym6030781
https://doi.org/10.1038/35059215
https://doi.org/10.1128/microbe.1.120.1
https://doi.org/10.1017/S1473550418000423
https://pubmed.ncbi.nlm.nih.gov/27630250/
https://doi.org/10.1117/12.2530036
https://ecampusontario.pressbooks.pub/microbio/chapter/photosynthesis/