Brown Dwarfs 
Brown Dwarfs
by Crash Course
Video Lecture 28 of 47
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Views: 483
Date Added: August 11, 2016

Lecture Description

While Jupiter is nowhere near massive enough to initiate fusion in its core, there are even more massive objects out there that fall just short of that achievement as well called brown dwarfs. Brown dwarfs, have a mass that places them between giant planets and small stars. They were only recently discovered in the 1990’s, but thousands are now known. More massive ones can fuse deuterium, and even lithium, but not hydrogen, distinguishing them from “normal” stars. Sort of.

Correction: In the illustration at 9:30, the numbers listed after the star names are the year of discovery, not distance.

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Table of Contents
Intermediate in Mass 1:22
Thousands Are Known 4:48
Cannot Fuse Hydrogen Like “Normal” Stars 8:46

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PHOTOS/VIDEOS
The sun in extreme ultraviolet en.wikipedia.org/wiki/File:The_Sun_in_extreme_ultraviolet.jpg [credit: NASA, ESA / Wikimedia Commons]
Jupiter www.spacetelescope.org/static/archives/images/screen/heic1410a.jpg [credit: NASA, ESA, and A. Simon (Goddard Space Flight Center)]
Forming a Planetary Gap www.spitzer.caltech.edu/video-audio/691-ssc2004-08v3-Forming-a-Planetary-Gap [credit: NASA/JPL-Caltech/R. Hurt (SSC/Caltech)]
Exoplanet uanews.org/sites/default/files/story-images/exoplanet.jpg [credit: NASA/JPL-Caltech]
A Trio of Brown Dwarfs (L/T/Y) www.nasa.gov/mission_pages/WISE/multimedia/pia14722.html [credit: NASA/JPL-Caltech]
Artist's concept of a T-type brown dwarf en.wikipedia.org/wiki/Brown_dwarf#/media/File:2MASSJ22282889-431026.jpg [credit: NASA/JPL-Caltech]
Brown Dwarf Gliese 229B en.wikipedia.org/wiki/File:Brown_Dwarf_Gliese_229B.jpg [credit: NASA / Wikimedia Commons]
Gliese 229B Spectrum - image provided by Phil Plait [credit: NASA/ESA/Hubble/Al Schultz et al]
Artist's vision of a T-dwarf en.wikipedia.org/wiki/Brown_dwarf#/media/File:T-dwarf-nasa-hurt.png [credit: R. Hurt/NASA - R. Hurt/NASA, Wikimedia Commons]
First Ultra-Cool WISE Brown Dwarf wise.ssl.berkeley.edu/gallery_firstbd.html [credit: NASA/JPL-Caltech/WISE Team]
Brown Dwarf Comparison www.nasa.gov/mission_pages/WISE/multimedia/pia12462.html [credit: NASA/JPL-Caltech/UCB]
Storms Expected on Brown Dwarfs www.spitzer.caltech.edu/images/5718-sig14-001-This-Just-In-Storms-Expected-on-Brown-Dwarfs [credit: NASA/JPL-Caltech/T. Pyle (IPAC)]
Stars and brown dwarfs closest to the Sun en.wikipedia.org/wiki/Luhman_16#/media/File:PIA18003-NASA-WISE-StarsNearSun-20140425-2.png [credit: NASA/Penn State University]

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.

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