Light: Crash Course Astronomy #24
About | Information | History | Online | Facts | Discovery
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 -- Table of Contents Light is a Form of Energy 0:39 Wavelength Tells Us Its Energy and Color 0:59 Spectroscopy 7:28 -- 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 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]
Comments
-
the truth is no scientist knows what energy or light really is they say light is without mass a trait of energy we know that Einstein said E= mc squared but if light has no Mass how can it have energy which is Mass now they're saying light is the trait of energy but if it's without mass how do you get nothing from nothing the traits are characteristics are the volume the color the smell but it's massless so there is no color.color is light but light is energy. it's a vicious cycle. I mean as far as I know they still haven't figured out why it acts the way it does when it's being observed which means? they know how to utilize it as a tool but the building blocks the foundation of what quantum theory is built on. speculation and Theory and science is what it is at its core observation through trial and error statistics wrapped around theory, opinions and agendas... I mean how many Nobel Peace prizes have they giving out on this stuff? your eyes can only see visible light they can't see infrared,microwaves I just don't get what that has to do with what light or energy is?
-
Are seeing colors limited to the eye and not the brain? If someone had an artificial, or more powerful eye, could they see what infrared or UV really looks like?(in terms of seeing color)
-
that is cool
-
just found this channel and ALREADY LOVE IT!!! Heading to PBS digital studios
-
really cool dude!!
:P -
i was able to differentiate the i guess the left one was a bit dark?
-
how is it blue shifted if the wave at the end is represented as purple
-
what causes the electron to move down a step in the first place ?
-
The guy on the motorcycle looked like hank green
-
Got an astronomy final worth 40% coming up, and this is how I study! Awesome series.
-
At what point do electrons give off energy? Is there a specific amount needed for that too?
-
wow, this episode just blows my mind. To think we can actually understand the universe because of a simple quirk of nature about how electrons work.
-
The square on the left was a bit darker of a shade, or at least that's how it looks to me without looking at rgb values.
-
phil you are an absolute legend ! your passion & enthusiasm is INCREDIBLY infectious !
-
I was taught we feel infrared energy as heat but was confused because visible light has more energy so we should feel that too. Also, what if an object was toooo hot. Would it still emit visible light. What if it was at a decillion degrees celcius? Wouldn't it be invisible to us because it would be emitting mainly in the gamma and higher frequencies.
-
I need to cite this video for a less-than-formal writing assignment. How would I cite this in MLA format?
-
I love Crash course because our teacher use this channel to teach us😀
-
No mention of the wave/particle duality or the speed of light? That surprises me.
-
Given that light energy can apply force on matter, a laser in space at least, could the light produced by our favorite star contribute a relative, or even measurable force upon matter on Earth's suface? hashtagcitizenscience.
-
Ethan Lock's auntie is HOTT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :DDDDD
10m 34sLenght
9826Rating