We all know that many planets have moons orbiting them, but is it possible for those moons have little moons of their own? Hosted by: Michael Aranda SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at www.scishowtangents.org ---------- Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Alex Schuerch, Alex Hackman, Andrew Finley Brenan, Sam Lutfi, D.A. Noe, الخليفي سلطان, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, charles george, Kevin Bealer, Chris Peters ---------- Looking for SciShow elsewhere on the internet? Facebook: www.facebook.com/scishow Twitter: www.twitter.com/scishow Tumblr: scishow.tumblr.com Instagram: instagram.com/thescishow ---------- Sources: arxiv.org/pdf/1810.03304.pdf gizmodo.com/astronomers-wonder-can-moons-have-moons-1829639045 www.smithsonianmag.com/smart-news/earths-moon-could-host-moonmoon-if-moonmoons-are-thing-180970520/ arxiv.org/pdf/0712.1156.pdf rstl.royalsocietypublishing.org/content/170/447.full.pdf+html www.jstor.org/stable/pdf/113751.pdf?seq=1#page_scan_tab_contents arxiv.org/pdf/astro-ph/0205035.pdf arxiv.org/pdf/1206.0334.pdf Image Sources: eoimages.gsfc.nasa.gov/images/imagerecords/73000/73909/world.topo.bathy.200412.3x5400x2700.png www.videoblocks.com/video/rotating-spiral-galaxy-deep-space-exploration-hjyawiepliybc3p66 photojournal.jpl.nasa.gov/catalog/PIA03456 photojournal.jpl.nasa.gov/catalog/PIA20016 photojournal.jpl.nasa.gov/catalog/PIA19062 moon.nasa.gov/resources/127/lunar-near-side/?category=images www.nasa.gov/press-release/astronomers-find-first-evidence-of-possible-moon-outside-our-solar-system