Now that we’ve finished our tour of the planets, we’re headed back to the asteroid belt. Asteroids are chunks of rock, metal, or both that were once part of smallish planets but were destroyed after collisions. Most orbit the Sun between Mars and Jupiter, but some get near the Earth. The biggest, Ceres, is far smaller than the Moon but still big enough to be round and has undergone differentiation.
CORRECTION: In the episode, we say that 2010 TK7 is 800 km away. However, 2010 TK7 stays on average 150 million kilometers from Earth, but that can vary wildly.
Sorry about that!
Check out the Crash Course Astronomy solar system poster here: [ Ссылка ]
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Chapters:
Introduction: Asteroids 00:00
What are Asteroids? 1:37
Structure of the Main Belt 2:18
Ceres's Structure 3:43
Vesta and other Main Belt Asteroids 4:38
Rubble Piles 5:16
Why did the Asteroid Belt form? 6:20
Mars-crossing, Apollo, and Aten Asteroids 7:16
Trojan Asteroids & Lagrange Points 8:25
How Asteroids Get Their Names 9:53
Review 10:41
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PHOTOS/VIDEOS
Timelapse of Asteroid 2004 FH's flyby [ Ссылка ] [credit: NASA/JPL Public Domain]
Asteroid Discovery Video [ Ссылка ] [credit: Scott Manley - scottmanley1972@gmail.com]
Inner Solar System [ Ссылка ] [credit: Wikimedia Commons]
Kirkwood gaps [ Ссылка ] [credit: Wikimedia Commons]
Ceres, Earth & Moon size comparison [ Ссылка ] [credit: NASA]
Dawn Glimpses Ceres’ North Pole [ Ссылка ] [credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA]
Ceres cutaway [ Ссылка ] [credit: NASA, ESA, and A. Feild (STScI)]
Bright Spot on Ceres Has Dimmer Companion [ Ссылка ] [credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA]
Vesta [ Ссылка ] [credit: NASA/JPL-Caltech/UCAL/MPS/DLR/IDA]
Lutetia [ Ссылка ].jpg [credit: ESA]
Gaspra [ Ссылка ] [credit: NASA]
Steins [ Ссылка ] [credit: ESA/Osiris]
Mathilde [ Ссылка ] [credit: NEAR Spacecraft Team, JHUAPL, NASA]
Ida [ Ссылка ] [credit: NASA/JPL]
Kleopatra [ Ссылка ] [credit: Stephen Ostro et al. (JPL), Arecibo Radio Telescope, NSF, NASA]
An artist's conception of two Pluto-sized dwarf planets in a collision around Vega. [ Ссылка ] [credit: NASA/JPL-Caltech/T. Pyle (SSC)]
Itokawa [ Ссылка ] [credit: ISAS, JAXA]
An artist's illustration showing two asteroid belts and a planet orbiting Epsilon Eridani [ Ссылка ]_(pd).jpg [credit: NASA/JPL-Caltech]
Near-Earth Asteroids [ Ссылка ] [credit: NASA/JPL-Caltech]
Lagrange Points Diagram [ Ссылка ]#/media/File:Lagrange_very_massive.svg [credit: Wikimedia Commons]
TK7 [ Ссылка ] [credit: NASA/JPL-Caltech/UCLA]
165347 Philplait [ Ссылка ] [credit: Larry Denneau/Pan-STARRS via Amy Mainzer]
![](https://i.ytimg.com/vi/auxpcdQimCs/maxresdefault.jpg)