by Crash Course
Video Lecture 27 of 47
Not yet rated
Views: 921
Date Added: August 11, 2016

Lecture Description

Today Phil explains that YES, there are other planets out there and astonomers have a lot of methods for detecting them. Nearly 2000 have been found so far. The most successful method is using transits, where a planet physically passes in front of its parent star, producing a measurable dip in the star’s light. Another is to measuring the Doppler shift in a star’s light due to reflexive motion as the planet orbits. Exoplanets appear to orbit nearly every kind of star, and we’ve even found planets that are the same size as Earth. We think there may be many billions of Earth-like planets in our galaxy.

This is a reupload of last week's episode to correct an error in the way we covered reflexive motion.
For more information on the change and reflexive motion, you can check out Phil's blog: www.slate.com/blogs/bad_astronomy/2015/08/07/crash_course_astronomy_exoplanets.html

Table of Contents
Other Planets Orbit Other Stars 2:10
Nearly 2000 Have Been Found 9:29
Transits 5:44
Doppler Shift 3:30
Exoplanets Orbit Nearly Every Kind of Star 8:44
Billions of Earth-Like Planets 9:33


PBS Digital Studios: youtube.com/pbsdigitalstudios

Follow Phil on Twitter: twitter.com/badastronomer

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


Stars as viewed from ISS www.youtube.com/watch?v=TOQrx-7qgak [credit: Alex Rivest & NASA]
Jupiter www.nasa.gov/centers/goddard/multimedia/largest/Jupiter_sphere.jpg.html [credit: NASA]
Mars mars.jpl.nasa.gov/multimedia/images/?ImageID=2633 [credit: NASA/JPL-Caltech/MSSS]
Mercury solarsystem.nasa.gov/multimedia/display.cfm?Category=Planets&IM_ID=7543 [credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington]
Earth www.nasa.gov/topics/earth/overview/index.html [credit: NASA]
Uranus photojournal.jpl.nasa.gov/catalog/PIA18182 [credit: NASA/JPL-Caltech]
Lost in the Glare planetquest.jpl.nasa.gov/video/23 [credit: NASA Kepler Mission/Dana Berry]
Reflexive Motion gifs spaceplace.nasa.gov/barycenter/en/ [credit: NASA]
Artist's conception of PSR B1257+12's system of planets en.wikipedia.org/wiki/Pulsar_planet#/media/File:Artist%27s_concept_of_PSR_B1257%2B12_system.jpg [credit: NASA/JPL-Caltech/R. Hurt (SSC)]
Artist’s impression of the exoplanet 51 Pegasi b (image) www.eso.org/public/usa/images/eso1517a/ [credit: ESO/M. Kornmesser/Nick Risinger (skysurvey.org)]
Artist’s impression of the exoplanet 51 Pegasi b (video) www.eso.org/public/usa/videos/eso1517b/ [credit: ESO/M. Kornmesser/Nick Risinger (skysurvey.org)]
Kepler Transit Graph planetquest.jpl.nasa.gov/video/22 [credit NASA Kepler Mission/Dana Berry]
Kepler “Beauty Shot” planetquest.jpl.nasa.gov/video/2 [credit: NASA/Kepler mission/Dana Berry]
The Brown Dwarf 2M1207 and its Planetary Companion www.eso.org/public/usa/images/eso0515a/ [credit: ESO]
Beta Pictoris b www.eso.org/public/archives/images/screen/eso1024c.jpg [credit: ESO]
A size comparison of the planets in the Kepler-37 system and objects in the Solar System photojournal.jpl.nasa.gov/catalog/PIA16694 [credit: NASA/Ames/JPL-Caltech]
Water World planetquest.jpl.nasa.gov/video/39 [credit: NASA Kepler Mission/Dana Berry]
Earth-like World planetquest.jpl.nasa.gov/video/42 [credit: NASA Kepler Mission/Dana Berry]

Course Index

Course Description

In this Crash Course series, marvel at the wonders of astronomy with your host for this intergalactic adventure, the Bad Astronomer himself -- Phil Plait. In just 40 short lessons, you will learn the basics of the oldest science known to humanity.

Be sure to check out links to relevant Photos in the description for each video.


There are no comments. Be the first to post one.
  Post comment as a guest user.
Click to login or register:
Your name:
Your email:
(will not appear)
Your comment:
(max. 1000 characters)
Are you human? (Sorry)