Welcome to the first episode of Crash Course Astronomy. Your host for this intergalactic adventure is the Bad Astronomer himself, Phil Plait. We begin with answering a question: "What is astronomy?" Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster -- Chapters: Introduction 00:00 What is Astronomy? 3:00 Who Studies Astronomy? 3:50 Origins of Astronomy 5:27 Astrology vs Astronomy 6:19 Geocentrism 7:51 Revolutions in Astronomy 8:58 Astronomy Today 10:26 Review 11:29 -- PBS Digital Studios: http://youtube.com/pbsdigitalstudios Follow Phil on Twitter: https://twitter.com/badastronomer Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: http://www.youtube.com/crashcoursekids -- Photos: http://commons.wikimedia.org/wiki/File:Earth_cutaway.png http://en.wikipedia.org/wiki/Earth%27s_magnetic_field#mediaviewer/File:Geodynamo_Between_Reversals.gif http://en.wikipedia.org/wiki/Geomagnetic_storm#mediaviewer/File:Magnetosphere_rendition.jpg http://en.wikipedia.org/wiki/Saturn#mediaviewer/File:Saturn_PIA06077.jpg http://en.wikipedia.org/wiki/243_Ida#mediaviewer/File:243_Ida_large.jpg http://commons.wikimedia.org/wiki/File:Comet_Hale_Bopp_NASA.jpg http://solarviews.com/raw/comet/kuiper3.jpg http://solarviews.com/cap/comet/kuiper3.htm http://en.wikipedia.org/wiki/List_of_nearest_bright_stars#mediaviewer/File:3_Solar_Interstellar_Neighborhood_(ELitU).png http://www.slate.com/blogs/bad_astronomy/2013/06/28/planetary_nebula_sh2_68_the_flaming_skull_nebula.html http://www.slate.com/blogs/bad_astronomy/2013/06/06/milky_way_galaxy_two_new_discoveries_about_its_spiral_arms.html http://en.wikipedia.org/wiki/Black_hole#mediaviewer/File:PIA16695-BlackHole-Corona-20130227.jpg http://commons.wikimedia.org/wiki/File:Messier_69_HST.jpg http://www.slate.com/blogs/bad_astronomy/2013/06/25/nearby_galaxies_swift_uv_pictures_of_two_galactic_neighbors.html http://upload.wikimedia.org/wikipedia/commons/0/0f/Earth%27s_Location_in_the_Universe_SMALLER_%28JPEG%29.jpg http://www.slate.com/blogs/bad_astronomy/2013/03/21/age_of_the_universe_planck_results_show_universe_is_13_82_billion_years.html http://www.esa.int/spaceinimages/Images/2007/02/True-colour_image_of_Mars_seen_by_OSIRIS http://en.wikipedia.org/wiki/Andromeda_Galaxy#mediaviewer/File:WISE-_Andromeda.jpg http://en.wikipedia.org/wiki/Triangulum_Galaxy#mediaviewer/File:VST_snaps_a_very_detailed_view_of_the_Triangulum_Galaxy.jpg http://en.wikipedia.org/wiki/Hubble_Space_Telescope#mediaviewer/File:HST-SM4.jpeg http://www.slate.com/blogs/bad_astronomy/2013/12/21/winter_solstice_2013_the_shortest_day_of_the_year.html http://www.slate.com/blogs/bad_astronomy/2012/12/28/full_moon_today_is_the_13th_full_moon_of_2012.html http://en.wikipedia.org/wiki/Nicolaus_Copernicus#mediaviewer/File:Nikolaus_Kopernikus.jpg http://en.wikipedia.org/wiki/Tycho_Brahe#mediaviewer/File:Tycho_Brahe.JPG http://en.wikipedia.org/wiki/Johannes_Kepler#mediaviewer/File:Johannes_Kepler_1610.jpg http://en.wikipedia.org/wiki/Isaac_Newton#mediaviewer/File:GodfreyKneller-IsaacNewton-1689.jpg http://en.wikipedia.org/wiki/Galileo_Galilei#mediaviewer/File:Justus_Sustermans_-_Portrait_of_Galileo_Galilei,_1636.jpg http://www.slate.com/blogs/bad_astronomy/2012/09/25/revealing_the_universe_the_hubble_extreme_deep_field.html
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embarassed to say i'm here because of project hail mary😭
This was very informative, appreciate it.
Here in 2026!
This is quality content.
You’re really good at this.
This is what YouTube was made for.
I watched this whole serirs a good year or two ago during my initial introduction into space and astronomy. Now im rewatching it in preparation for my job lol.
studying astronomy to write a fanfiction :P trying my best!
This is an amazing Astronomy guide, and the quality of the entire thing is obviously top notch. I'm a geologist and at 1:44 when you say the Earth is mostly molten rock and metal, I have to clarify that there is very little molten rock in terms of volume of the whole planet. Magma is only formed near the surface where the pressure is low enough to allow it to expand into a liquid. But it's also exposed to the coldness of Space, so it becomes solid relatively quickly. I have seen this misconception before so I thought I would mention it for anyone who would find it useful :)
Anyone in 2024?
That Fault in Our Stars joke was too good
love astronomy because I love to know everything that is unknown, I like to explore and know everything about the world so that I can die knowing that I know everything. I am an INFJ personality.
I'm pumped, ready to learn the stars ⭐
Me 🤝 picking up random interests
Me trying to learn stuff before i go star gazing to impress my bf
7:10 "The fault of astrology lies in ourselves, and not our stars." William Shakespeare, who said the original quote, is reading the book "The Fault in our Stars." Very cute.
My college course starts in two days and don't know shit. So I'm here learning before I start 😄
Every time i see pics of galaxies in the universe i get so mindboggled and think i can't even imagine idea of just how small we really.
U are helping me to be astrophysicist thanks alot will always remember you
this is easily the best crash course series... no the best complexly series hands down. I have to watch this at least once a year