Visit https://brilliant.org/scishow/ to get started learning STEM for free. The first 200 people will get 20% off their annual premium subscription and a 30-day free trial. In 2017, astronomers discovered 'Oumuamua — the first definitive interstellar visitor to our solar system. But definitive evidence of space rocks that don't just visit but join our solar system is a little more elusive. Hosted by: Reid Reimers (he/him) ---------- 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: Adam Brainard, Alex Hackman, Ash, Benjamin Carleski, Bryan Cloer, charles george, Chris Mackey, Chris Peters, Christoph Schwanke, Christopher R Boucher, DrakoEsper, Eric Jensen, Friso, Garrett Galloway, Harrison Mills, J. Copen, Jaap Westera, Jason A Saslow, Jeffrey Mckishen, Jeremy Mattern, Kenny Wilson, Kevin Bealer, Kevin Knupp, Lyndsay Brown, Matt Curls, Michelle Dove, Piya Shedden, Rizwan Kassim, Sam Lutfi ---------- Looking for SciShow elsewhere on the internet? SciShow Tangents Podcast: https://scishow-tangents.simplecast.com/ TikTok: https://www.tiktok.com/@scishow Twitter: http://www.twitter.com/scishow Instagram: http://instagram.com/thescishow Facebook: http://www.facebook.com/scishow #SciShow #science #education #learning #complexly ---------- Sources: https://www.oxfordreference.com/display/10.1093/acref/9780191866692.001.0001/q-oro-ed6-00005651 https://www.wolframalpha.com/input?i=distance+to+proxima+centauri+%2F+60+mph https://www.nasa.gov/solar-system/small-asteroid-or-comet-visits-from-beyond-the-solar-system/ https://www.schoolsobservatory.org/learn/astro/esm/orbits/orb_ell https://www.sciencedirect.com/topics/physics-and-astronomy/hyperbolic-orbit https://www.space.com/17638-how-big-is-earth.html https://www.britannica.com/science/interstellar-object https://www.space.com/42352-oumuamua-interstellar-object-alien-light-sail.html https://www.smithsonianmag.com/smart-news/new-theory-suggests-oumuamua-nitrogen-ice-pancake-180977293/ https://daily.jstor.org/why-interstellar-objects-like-oumuamua-and-borisov-may-hold-clues-to-exoplanets/ https://www.sciencenews.org/article/interstellar-comet-borisov-has-lots-carbon-monoxide https://www.universetoday.com/161434/a-few-interstellar-objects-have-probably-been-captured/ https://academic.oup.com/mnrasl/article/477/1/L117/4996014 https://www.science.org/doi/10.1126/science.272.5266.1310 https://academic.oup.com/mnras/article/525/1/908/7233732?login=false https://www.sciencedirect.com/science/article/abs/pii/S0019103514003546 https://iopscience.iop.org/article/10.3847/PSJ/ac29bb https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=1980E1&view=OPC https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%271980+E1%27&MAKE_EPHEM=%27YES%27&TABLE_TYPE=%27OBSERVER%27&START_TIME=%271995-06-04%27&STOP_TIME=%271995-06-05%27&STEP_SIZE=%271%20day%27&QUANTITIES=%2719,22%27&CENTER=%27@sun%27 Image Sources: https://tinyurl.com/yr3694jx https://en.wikipedia.org/wiki/File:A2017U1_5gsmoothWHT_enhanced.jpg https://tinyurl.com/4es6hrvz https://commons.wikimedia.org/wiki/File:Juno_flight_path_20130815.jpg https://tinyurl.com/4km38z5k https://commons.wikimedia.org/wiki/File:Artist_Impression-_Interstellar_object_rapidly_approaching_our_Solar_System_(noirlab2322a).jpg https://commons.wikimedia.org/wiki/File:Artist%27s_impression_of_%CA%BBOumuamua.jpg https://commons.wikimedia.org/wiki/File:A_comparison_of_two_interstellar_objects_passing_through_our_solar_system.gif https://tinyurl.com/bdfp8skb https://commons.wikimedia.org/wiki/File:Artist%E2%80%99s_Impression_of_%60Oumuamua_(2018-25-4204).png https://commons.wikimedia.org/wiki/File:%60Oumuamua_1i_2017_U1.png https://commons.wikimedia.org/wiki/File:Comet-2I-Borisov-Orbit-JPL.png https://commons.wikimedia.org/wiki/File:Comet_2I_Borisov_at_Perihelion_in_December_2019.tif https://commons.wikimedia.org/wiki/File:Comet2019Q4-InterstellarObject-20190912.gif https://commons.wikimedia.org/wiki/File:2015_BZ509-orbit.png https://en.wikipedia.org/wiki/File:2015_BZ509-retrograde-near-sun.png https://commons.wikimedia.org/wiki/File:Comet_Hyakutake_by_John_Walker.gif https://commons.wikimedia.org/wiki/File:Comet_Hyakutake_-_Eso9617a.jpg https://www.gettyimages.com/detail/video/asteroid-field-stock-footage/473340835 https://www.gettyimages.com/detail/video/meteor-asteroid-entering-earth-atmosphere-stock-footage/1340390673?adppopup=true https://www.gettyimages.com/detail/video/dark-night-starry-sky-with-stars-and-milky-way-galaxy-stock-footage/1144729327 https://www.gettyimages.com/detail/video/solar-system-with-all-planets-and-milky-way-in-the-stock-footage/1669517559 https://commons.wikimedia.org/wiki/File:Animation_of_C%EF%BC%8F1980_E1_orbit.gif https://commons.wikimedia.org/wiki/File:Voyager_spacecraft.jpg https://commons.wikimedia.org/wiki/File:PIA17046_-_Voyager_1_Goes_Interstellar.jpg