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Meteors: Crash Course Astronomy #23

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.:
Big Kahuna Meteorites:
Arizona Skies Meteorites:

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

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PHOTOS/VIDEOS
Shooting star [credit: Randy Halverson / Dakotalapse.com]
Cosmic Fireball Falling Over ALMA [credit: ESO / Christoph Malin]
Meteor light [credit: Randy Halverson / Dakotalapse.com]
Bolide 10/16/14 [credit: reddit user -545-]
Meteor Video [credit: NASA/Goddard Space Flight Center]
Orbit Video [credit: NASA’s Scientific Visualization Studio]
When Gemini Sends Stars to Paranal [credit: Stephane Guisard]
Perseid below space station [credit: NASA]
Geminids shower [credit: Neil Zeller]
Cygnus Reentry [credit: ESA/NASA]
Stony meteorite [credit: Wikimedia Commons, H. Raab]
Iron meteorite [credit: Wikimedia Commons, Daderot]
Stony iron meteorite [credit: Wikimedia Commons, Supportstorm]
Chondrites [credit: Wikimedia Commons, James St. John]
Pallasite [credit: James St. John]
Aftermath of Chelyabinsk Meteor [credit: NASA]
Near-Earth asteroid 2013 [credit: Gianluca Masi, permission granted by author]
Dinosaur drawing courtesy of Zach Weiner of Saturday Morning Breakfast Cereal