Does a lifetime supply of Mac and Cheese sound like success to you? 

(Source: youtube.com)

In order to understand how we study the universe, we need to talk a little bit about light. Light is a form of energy. Its wavelength tells us its energy and color. Spectroscopy allows us to analyze those colors and determine an object’s temperature, density, spin, motion, and chemical composition.

Crash Course Chemistry posters are available at DFTBA.com
http://www.dftba.com/crashcourse

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Table of Contents
Light is a Form of Energy 0:39
Wavelength Tells Us Its Energy and Color 0:59
Spectroscopy 7:28

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PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Follow Phil on Twitter: https://twitter.com/badastronomer

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PHOTOS/VIDEOS
Wavelengths http://imagine.gsfc.nasa.gov/educators/gammaraybursts/starchild/Image6.gif [credit: Imagine the Universe! / NASA]
Observatories across spectrum http://imagine.gsfc.nasa.gov/Images/science/observatories_across_spectrum_full.jpg [credit: Imagine the Universe! / NASA]
Red hot spiral hotplate http://freefoodphotos.com/imagelibrary/cooking/slides/hot_electric_cooker.html [credit: freefoodphotos.com]
The Crab Nebula http://en.wikipedia.org/wiki/Nebula#/media/File:Crab_Nebula.jpg [credit: NASA, ESA, J. Hester and A. Loll (Arizona State University)]
Building the Space Telescope Imaging Spectograph http://imgsrc.hubblesite.org/hu/gallery/db/spacecraft/18/formats/18_print.jpg [credit: NASA]
VST images the Lagoon Nebula http://en.wikipedia.org/wiki/Lagoon_Nebula#/media/File:VST_images_the_Lagoon_Nebula.jpg [credit: ESO/VPHAS+ team]
Jupiter http://www.nasa.gov/images/content/414987main_pia09339.jpg [credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute]
Venus http://en.wikipedia.org/wiki/Atmosphere_of_Venus#/media/File:Venuspioneeruv.jpg [credit: NASA - NSSDC Photo Gallery Venus]
Ring Around SN 1987a, image 1 http://www.spacetelescope.org/images/opo9714e/ [credit: Jason Pun (NOAO) and SINS Collaboration]
Ring Around SN 1987a, image 2 http://www.spacetelescope.org/images/opo9714a/ [credit: George Sonneborn (GSFC) and NASA/ESA]

In which Jacob Clifford and Adriene Hill launch a brand new Crash Course on Economics! So, what is economics? Good question. It’s not necessarily about money, or stock markets, or trade. It’s about people and choices. What, you may ask, does that mean. We’ll show you. Let’s get started!

Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:
Mark Brouwer, Jan Schmid, Anna-Ester Volozh, Robert Kunz, Jason A Saslow, Christian Ludvigsen, Chris Peters, Brad Wardell, Beatrice Jin, Roger C. Rocha, Eric Knight, Jessica Simmons, Jeffrey Thompson, Elliot Beter, Today I Found Out, James Craver, Ian Dundore, Jessica Wode, SR Foxley, Sandra Aft, Jacob Ash, Steve Marshall

TO: My Students
FROM: Mrs. Culp

Culpzilla’s students are amazing! You guys rock!

TO: Everyone
FROM: Pankaj

DFTBA and keep being the exception like the Mongols.

Thank you so much to all of our awesome supporters for their contributions to help make Crash Course possible and freely available for everyone forever:

Summer Naugle, Minnow, Ilkka Hemmilä, Kaitlyn Celeste, Lee Toran,
Sarty, Damian Shaw, Nathaniel “The Skipper” Cruz Chavez, Maura Doyle, Chris, Sander Mutsaers

Your heart gets a lot of attention from poets, songwriters, and storytellers, but today Hank’s gonna tell you how it really works. The heart’s ventricles, atria, and valves create a pump that maintains both high and low pressure to circulate blood from the heart to the body through your arteries, and bring it back to the heart through your veins. You’ll also learn what your blood pressure measurements mean when we talk about systolic and diastolic blood pressure.

Table of Contents
Heart’s Ventricles, Atria and Valves Create a Pump 3:25
Maintains Both High and Low Pressure 3:25
Blood Circulates From the Heart to the Body Through Your Arteries 4:47
Blood Circulates From the Body to the Heart Through Your Veins 4:49
Systolic and Diastolic Blood Pressure 7:58

Crash Course Psychology posters available now at DFTBA.com!
http://www.dftba.com/crashcourse

***

Crash Course is now on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Mark Brouwer, Jan Schmid, Anna-Ester Volozh, Robert Kunz, Jason A Saslow, Christian Ludvigsen, Chris Peters, Brad Wardell, Beatrice Jin, Roger C. Rocha, Eric Knight, Jessica Simmons, Jeffrey Thompson, Elliot Beter, Today I Found Out, James Craver, Ian Dundore, Jessica Wode, SR Foxley, Sandra Aft, Jacob Ash, Steve Marshall

***SUBBABLE MESSAGES***

TO: My Student
FROM: Earle

Check out www.youtube.com/amorsciendi for supplementary content.

–

TO: Everyone
FROM: Magnus Krokstad

Keep dreaming!

***SUPPORTER THANK YOU!***

Thank you so much to all of our awesome supporters for their contributions to help make Crash Course possible and freely available for everyone forever:

Damian Shaw, Taylor Garget, Emily Barker, Librarifan, Damian Shaw, Courtney Spurgeon, juliagraph, Katherine Allen, Stephen DeCubellis, Vanessa Benavent

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Want to find Crash Course elsewhere on the internet?
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Today Phil helps keep you from ticking off an astronomer in your life by making sure you know the difference between a meteor, meteorite, and meteoroid. When the Earth plows through the stream emitted by a comet we get a meteor shower. Meteors burn up about 100 km above the Earth, but some survive to hit the ground. Most of these meteorites are rocky, some are metallic, and a few are a mix of the two. Very big meteorites can be a very big problem, but there are plans in the works to prevent us from going the way of the dinosaurs.

Meteorite Links:
Aerolite Meteorites, Inc.: http://www.aerolite.org/
Big Kahuna Meteorites: http://bigkahuna-meteorites.com/
Arizona Skies Meteorites: http://www.arizonaskiesmeteorites.com/

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Table of Contents
What Meteors Are 0:59
Meteor Shower 4:22
What Meteors Are Made Of 7:10
Very Big Meteorites Can Be a Very Big Problem 8:36

–

PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Follow Phil on Twitter: https://twitter.com/badastronomer

Want to find Crash Course elsewhere on the internet?
Facebook - http://www.facebook.com/YouTubeCrashCourse
Twitter - http://www.twitter.com/TheCrashCourse
Tumblr - http://thecrashcourse.tumblr.com
Support CrashCourse on Patreon: http://www.patreon.com/crashcourse

–

PHOTOS/VIDEOS
Shooting star http://dakotalapse.com/wp-content/uploads/2013/02/IMG_5555-reboot1.jpg [credit: Randy Halverson / Dakotalapse.com]
Cosmic Fireball Falling Over ALMA http://www.eso.org/public/usa/images/potw1414a/ [credit: ESO / Christoph Malin]
Meteor light https://sphotos-b.xx.fbcdn.net/hphotos-ash3/704204_406950402710734_1157020008_o.jpg [credit: Randy Halverson / Dakotalapse.com]
Bolide 10/16/14 https://www.youtube.com/watch?v=GZXqmPhd8AQ [credit: reddit user -545-]
Meteor Video http://svs.gsfc.nasa.gov/vis/a010000/a010700/a010747/10747_Swift_Asteroid_H264_Good_1280x720_29.97.mov [credit: NASA/Goddard Space Flight Center]
Orbit Video http://svs.gsfc.nasa.gov/vis/a000000/a004100/a004159/209PLINEAR-swingAround.slate.HD1080.mp4 [credit: NASA’s Scientific Visualization Studio]
When Gemini Sends Stars to Paranal http://twanight.org/newTWAN/photos.asp?ID=3003955 [credit: Stephane Guisard]
Perseid below space station http://apod.nasa.gov/apod/image/1208/iss028e024847perseid.jpg [credit: NASA]
Geminids shower http://www.slate.com/blogs/bad_astronomy/2014/12/15/geminids_meteor_shower_photo.html [credit: Neil Zeller]
Cygnus Reentry http://www.slate.com/blogs/bad_astronomy/2014/08/18/fireball_astronauts_photograph_cygnus_resupply_ship_burning_up.html [credit: ESA/NASA]
Stony meteorite http://en.wikipedia.org/wiki/File:AllendeMeteorite.jpg [credit: Wikimedia Commons, H. Raab]
Iron meteorite http://commons.wikimedia.org/wiki/File:Nickel-iron_meteorite_fragment,_5.5_billion_years_old,_found_near_Flagstaff_AZ_-_Franklin_Institute_-_DSC06707.JPG [credit: Wikimedia Commons, Daderot]
Stony iron meteorite http://en.wikipedia.org/wiki/Pallasite#/media/File:Bernham_meteorite_sept_2010.JPG [credit: Wikimedia Commons, Supportstorm]
Chondrites http://commons.wikimedia.org/wiki/File:Allende_meteorite,_carbonaceous_chondrite_(14787764392).jpg [credit: Wikimedia Commons, James St. John]
Pallasite https://www.flickr.com/photos/jsjgeology/14608975850/ [credit: James St. John]
Aftermath of Chelyabinsk Meteor https://www.youtube.com/watch?v=Q9KwK0izt5c [credit: NASA]
Near-Earth asteroid 2013 https://www.youtube.com/watch?v=RmPsQdEHyPU [credit: Gianluca Masi, permission granted by author]
Dinosaur drawing courtesy of Zach Weiner of Saturday Morning Breakfast Cereal http://www.smbc-comics.com/?id=1535

In which Jacob Clifford and Adriene Hill introduce you to Crash Course Economics! CC Econ is a new course from the Crash Course team. We look forward to teaching you all about the so-called dismal science.