Astronomers have found more evidence for Planet 9, but another study has added another problem to our list of space travel problems.
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Sources:
“A New High Perihelion Inner Oort Cloud Object”, Sheppard et al.
https://www.eurekalert.org/emb_releases/2018-10/cifs-ned092618.php
http://iopscience.iop.org/article/10.1086/504422/meta
https://academic.oup.com/mnras/article/91/4/380/1046636
http://adsabs.harvard.edu/abs/1997pqed.book…..C
“Out of the Darkness: The Planet Pluto”, by Clyde Tombaugh and Patrick Moore.
https://www.nature.com/articles/nature13156
http://www.pnas.org/cgi/doi/10.1073/pnas.1807522115
https://www.eurekalert.org/emb_releases/2018-10/gumc-ass092618.php
https://three.jsc.nasa.gov/concepts/SpaceRadiationEnviron.pdf
https://science.nasa.gov/science-news/science-at-nasa/2004/17feb_radiation
https://www.nature.com/articles/232421a0
https://link.springer.com/article/10.1007%2Fs00417-002-0489-4
http://www.bioone.org/doi/abs/10.1667/0033-7587%282001%29156%5B0460%3ASRACIA%5D2.0.CO%3B2
https://www.nasa.gov/sites/default/files/atoms/files/space_radiation_ebook.pdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4441880/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5752736/
http://theconversation.com/of-mice-and-men-why-animal-trial-results-dont-always-translate-to-humans-73354
https://emergency.cdc.gov/radiation/ki.asp
https://www.nasa.gov/pdf/284275main_Radiation_HS_Mod3.pdf
Images:
https://commons.wikimedia.org/wiki/File:Planet_nine_artistic_plain3.png
https://en.wikipedia.org/wiki/File:2015_TG387_hoverview.png
https://en.wikipedia.org/wiki/File:Sedna_solar_system_Jan1_2017.png
https://en.wikipedia.org/wiki/File:2012_VP113_orbit_with_solar_system.png
https://commons.wikimedia.org/wiki/File:Planet_nine-etnos_now-new3.png
http://www.thinkstockphotos.com/image/stock-photo-3d-illustration-of-human-body-digenative/699786364
https://en.wikipedia.org/wiki/File:PIA16938-RadiationSources-InterplanetarySpace.jpg
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