Meteors: Crash Course Astronomy #23

Опубликовано: 09 Январь 2025
на канале: CrashCourse

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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.

Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crash...

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

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Chapters:
Introduction: Meteors 00:00
Shooting Stars, Meteoroids, Meteors, or Meteorites? 1:15
Kinetic Energy 1:53
Compression & Ablation 2:57
Sporadic Meteors 3:45
Meteor Showers 4:23
Bolides 6:24
Classifying Meteorites 7:12
Very Big Meteorite = Very Big Problem 8:36
Review 10:20
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PHOTOS/VIDEOS
Shooting star http://dakotalapse.com/wp-content/upl... [credit: Randy Halverson / Dakotalapse.com]
Cosmic Fireball Falling Over ALMA http://www.eso.org/public/usa/images/... [credit: ESO / Christoph Malin]
Meteor light https://sphotos-b.xx.fbcdn.net/hphoto... [credit: Randy Halverson / Dakotalapse.com]
Bolide 10/16/14    • Bolide 10/16/14   [credit: reddit user -545-]
Meteor Video http://svs.gsfc.nasa.gov/vis/a010000/... [credit: NASA/Goddard Space Flight Center]
Orbit Video http://svs.gsfc.nasa.gov/vis/a000000/... [credit: NASA's Scientific Visualization Studio]
When Gemini Sends Stars to Paranal http://twanight.org/newTWAN/photos.as... [credit: Stephane Guisard]
Perseid below space station http://apod.nasa.gov/apod/image/1208/... [credit: NASA]
Geminids shower http://www.slate.com/blogs/bad_astron... [credit: Neil Zeller]
Cygnus Reentry http://www.slate.com/blogs/bad_astron... [credit: ESA/NASA]
Stony meteorite http://en.wikipedia.org/wiki/File:All... [credit: Wikimedia Commons, H. Raab]
Iron meteorite http://commons.wikimedia.org/wiki/Fil... [credit: Wikimedia Commons, Daderot]
Stony iron meteorite http://en.wikipedia.org/wiki/Pallasit... [credit: Wikimedia Commons, Supportstorm]
Chondrites http://commons.wikimedia.org/wiki/Fil... [credit: Wikimedia Commons, James St. John]
Pallasite https://www.flickr.com/photos/jsjgeol... [credit: James St. John]
Aftermath of Chelyabinsk Meteor    • NASA | NPP Sees Aftermath of the Chel...   [credit: NASA]
Near-Earth asteroid 2013    • Near-Earth asteroid 2013 XY8 close en...   [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