Crash Course – Astronomy – 21: Comets

This is the twenty first video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video examines the beautiful and fascinating dirty snowballs called comets.

From the video description:

Table of Contents:

  • Comets Are Chunks of Rock and Ice That Orbit the Sun 1:26
  • When They Get Near the Sun They Turn Into Gas 2:08
  • Comets Release Gas Via Vents As Ice Sublimates 2:15
  • Comets May Have Brought Water and Ingredients for Life to Earth 9:30

Crash Course – Astronomy – 20: Asteroids

This is the twentieth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video examines the millions of rocky or metallic bodies that make up the asteroid belt.

From the video description:

Table of Contents:

  • Asteroids Are Chunks of Rock, Metal, or Both 1:45
  • Most Orbit the Sun Between Mars and Jupiter 7:16
  • Ceres is Far Smaller Than the Moon, But Large Enough to be Round 3:43

Crash Course – Astronomy – 19: Uranus & Neptune

This is the nineteenth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video examines the atmosphere, rotation and moons of Uranus and Neptune.

From the video description:

Table of Contents:

  • Ice Giants With Small Rocky Cores 2:18
  • Thick Mantles of Ammonia, Water, and Methane 1:53
  • Atmospheres Makes Them Look Green And Blue 2:53
  • Uranus Has Dull Weather 3:35
  • Neptune Has Active Weather 7:19
  • Both Have Rings And Moons 5:12

Crash Course – Astronomy – 18: Saturn

This is the eighteenth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video examines Saturn, the beautiful gas giant, its rings and moons.

From the video description:

Table of Contents:

  • Saturn is a Gas Giant 0:33
  • Moons Create Gaps in the Ice Rings 5:17
  • Dozens of Moons 6:18
  • Titan’s Methane Lakes 7:56
  • Enceladus’s Water Geysers 8:33
  • Life Potential 9:30

Crash Course – Astronomy – 17: Jupiter’s Moons

This is the seventeenth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video examines the moons of Jupiter, focusing on the four large Galilean moons.

From the video description:

Table of Contents:

  • Jupiter Has 67 Moons (4 Big Ones) 0:12
  • Ganymede is the Largest 1:15
  • Io is Riddled With Volcanoes 3:16
  • Europa Has an Undersurface Ocean 4:48
  • Io, Europa, and Ganymede Interact Gravitationally 3:48
  • Known Unknowns 8:06

Crash Course – Astronomy – 16: Jupiter

This is the sixteenth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video examines the atmosphere and interior of the largest planet in our system, Jupiter.

From the video description:

Table of Contents:

  • Jupiter is the Biggest Planet in Our Solar System 0:28
  • Belts and Zones 1:33
  • Persistent Hurricane 2:32
  • Metallic Hydrogen Interior 4:03
  • Fast Spin 0:49
  • Not a Failure 6:17

Crash Course – Astronomy – 15: Mars

This is the fifteenth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video examines the planet Mars, its surface, interior, and history.

From the video description:

Table of Contents:

  • Mars is Colder and Smaller Than Earth 0:56
  • Polar Ice Caps 3:29
  • Rusty & Dusty 1:16
  • Huge Volcanoes 2:32
  • Mars’s Past Geography 6:33

Crash Course – Astronomy – 14: Venus

This is the fourteenth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video examines Venus, the hottest planet in the Solar System. The runaway greenhouse effect, volcanic activity, and reversed rotation compared to other planets in the system are discussed.

From the video description:

Table of Contents:

  • Venus’s Size and Atmosphere 3:09
  • Hottest Planet in the Solar System 4:04
  • Slow Clockwise Rotation 6:02
  • Tremendous Volcanic Activity 8:31

Crash Course – Astronomy – 13: Mercury

This is the thirteenth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video looks at Mercury, the closest planet to the Sun.

From the video description:

Table of Contents:

  • Closest Planet to the Sun 0:03
  • Rotation Locked to its 2 to 3 Orbit Ratio 3:10
  • Deep Crater Water Ice 8:39

Crash Course – Astronomy – 12: The Moon

This is the twelfth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video looks at the structure and surface of the Moon, and describes the theories on its formation.

From the video description:

Table of Contents:

  • Many Millions of Moons 0:27
  • Big Impact on Little Earth 3:42
  • Craters and Maria 2:15
  • Water on the Moon? H2O Yeah! 8:06