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Crash Course Astronomy

Life in the Universe: Crash Course Astronomy #46

Crash Course Astronomy

Life in the Universe: Crash Course Astronomy #46

11m 9s

Here it is, folks: the end. In our final episode of Crash Course Astronomy, Phil gives the course a send off with a look at some of his favorite topics and the big questions that Astronomy allows us to ask.

Available to viewers in US and Canada
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10m 40s

Stars: Crash Course Astronomy #26

Today PhilÕs explaining the stars and how they can be categorized using their spectra. Together with their distance, this provides a wealth of information about them including their luminosity, size, and temperature. The HR diagram plots starsÕ luminosity versus temperature, and most stars fall along the main sequence, where they live most of their lives.

Available to viewers in US and Canada
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11m 21s

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.

Available to viewers in US and Canada
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11m 54s

Comets: Crash Course Astronomy #21

Today on Crash Course Astronomy, Phil explains comets. Comets are chunks of ice and rock that orbit the Sun. When they get near the Sun the ice turns into gas, forming the long tail, and also releases dust that forms a different tail. WeÕve visited comets up close and found them to be lumpy, with vents in the surface that release the gas as ice sublimates.

Available to viewers in US and Canada
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12m 12s

Saturn: Crash Course Astronomy #18

Saturn is the crown jewel of the solar system, beautiful and fascinating. It is a gas giant, and has a broad set of rings made of ice particles. Saturn has dozens of moons, including Titan, which is as big as Mercury and has a thick atmosphere and lakes of methane; and Enceladus which has an undersurface ocean and eruptions of water geysers.

Available to viewers in US and Canada
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10m 11s

Mars: Crash Course Astronomy #15

The fourth planet from the sun and the outermost of the terrestrial planets, Mars has long been a popular spot for missions and imagination. Phil walks you through the planet's topography, core, and features. We'll take a look back to Mars's past and makes predictions for its future, including the possibilities for human life.

Available to viewers in US and Canada
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10m 46s

Venus: Crash Course Astronomy #14

Venus is a gorgeous naked-eye planet, hanging like a diamond in the twilight -- but itÕs beauty is best looked at from afar. Even though Mercury is closer to the sun, Venus is the hottest planet in the solar system, due to a runaway greenhouse effect, and has the most volcanic activity in the solar system.

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