Skip to main content

Become a KCTS 9 Passport member for just $5 a month to access thousands of hours of PBS programs and specials

Your donation supports an essential community service, is tax-deductible, and helps make the programs you depend on possible

Crash Course Astronomy

Dark Matter: Crash Course Astronomy #41

Crash Course Astronomy

Dark Matter: Crash Course Astronomy #41

11m 45s

Today on Crash Course Astronomy, Phil dives into some very dark matters. The stuff we can actually observe in the universe isn’t all there is. Galaxies and other large structures in the universe are created and shifted by a force we detect mostly indirectly, by observing its impact: DARK MATTER.

Available to viewers in US and Canada
Play
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
Play
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
Play
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
Play
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
Play
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
Play
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.

Supported by

Your schedule, your shows, your KCTS 9.

You make KCTS 9 possible. Become a member and enjoy the benefit of KCTS 9 Passport, an on-demand library of 1,500+ episodes of your favorite PBS shows.

Only $5/month.

Get Passport