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    crash-course-astronomy-29


    
  • Low Mass Stars: Crash Course Astronomy #29

    Today we are talking about the life -- and death -- of stars. Low mass stars live a long time, fusing all their hydrogen into helium over a trillion years.

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  • Cycles in the Sky: Crash Course Astronomy #3

    This week we build on our naked eye observations from last week and take a look at the cyclical phenomena that we can see at work in the universe. -- Table of ...

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  • Exoplanets: Crash Course Astronomy #27

    Today Phil explains that YES, there are other planets out there and astonomers have a lot of methods for detecting them. Nearly 2000 have been found so far.

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  • Binary and Multiple Stars: Crash Course Astronomy #34

    Double stars are stars that appear to be near each other in the sky, but if they're gravitationally bound together we call them binary stars. Many stars are actually ...

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  • Black Holes: Crash Course Astronomy #33

    We've covered a lot of incredible stuff, but this week we're talking about the weirdest objects in space: BLACK HOLES. Stellar mass black holes form when a ...

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  • Moon Phases: Crash Course Astronomy #4

    In this episode of Crash Course Astronomy, Phil takes you through the cause and name of the Moon's phases. -- Why the Moon Has Phases 0:36.1 Spheres in ...

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  • Galaxies, part 1: Crash Course Astronomy #38

    The Milky Way is our neighborhood in the universe. It's a galaxy and there are many others out there. Galaxies contain gas, dust, and billions of stars or more.

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  • Star Clusters: Crash Course Astronomy #35

    Last week we covered multiple star systems, but what if we added thousands or even millions of stars to the mix? A star cluster. There are different kinds of ...

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  • 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 ...

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  • Introduction to the Solar System: Crash Course Astronomy #9

    In today's Crash Course Astronomy, Phil takes a look at the explosive history of our cosmic backyard. We explore how we went from a giant ball of gas to the ...

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  • Telescopes: Crash Course Astronomy #6

    Today Phil explains how telescopes work and offers up some astronomical shopping advice. -- How Telescopes Work 1:07 Refractors vs Reflectors 2:50 ...

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  • 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 ...

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  • Introduction to Astronomy: Crash Course Astronomy #1

    Welcome to the first episode of Crash Course Astronomy. Your host for this intergalactic adventure is the Bad Astronomer himself, Phil Plait. We begin with ...

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  • High Mass Stars: Crash Course Astronomy #31

    Massive stars fuse heavier elements in their cores than lower mass stars. This leads to the creation of heavier elements up to iron. Iron robs critical energy from ...

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  • The Sun: Crash Course Astronomy #10

    Phil takes us for a closer (eye safe!) look at the two-octillion ton star that rules our solar system. We look at the sun's core, plasma, magnetic fields, sunspots, ...

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  • Outtakes #3: Crash Course Astronomy

    Today we're taking a break for another round of "Bad Astronomy" Crash Course Astronomy posters available at DFTBA.com ...

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  • Nebulae: Crash Course Astronomy #36

    Astronomers study a lot of gorgeous things, but nebulae might be the most breathtakingly beautiful of them all. Nebulae are clouds of gas and dust in space.

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  • Jupiter: Crash Course Astronomy #16

    Jupiter is the biggest planet in our solar system. The gas giant is NOT a failed star, but a really successful planet! It has a dynamic atmosphere with belts and ...

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  • Distances: Crash Course Astronomy #25

    How do astronomers make sense out of the vastness of space? How do they study things so far away? Today Phil talks about distances, going back to early ...

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  • Neutron Stars: Crash Course Astronomy #32

    In the aftermath of a 8 – 20 solar mass star's demise we find a weird little object known as a neutron star. Neutrons stars are incredibly dense, spin rapidly, and ...

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  • Brown Dwarfs: Crash Course Astronomy #28

    While Jupiter is nowhere near massive enough to initiate fusion in its core, there are even more massive objects out there that fall just short of that achievement ...

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  • Outtakes #1: Crash Course Astronomy

    After 10 information-heavy episodes, it's time for a little Bad Astronomy. -- PBS Digital Studios: http://youtube.com/pbsdigitalstudios Follow Phil on Twitter: ...

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  • Outtakes #5: Crash Course Astronomy

    One last round of laughs with Phil as he struggles through some Bad Astronomy. -- Crash Course Astronomy Poster: ...

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  • Stars: Crash Course Astronomy #26

    Today Phil's explaining the stars and how they can be categorized using their spectra. Together with their distance, this provides a wealth of information about ...

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  • Venus: Crash Course Astronomy #14

    Venus is a gorgeous naked-eye planet, hanging like a diamond in the twilight -- but it's beauty is best looked at from afar. Even though Mercury is closer to the ...

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  • Gamma-Ray Bursts: Crash Course Astronomy #40

    Gamma-ray bursts are not only incredible to study, but their discovery has an epic story all its own. Today Phil takes you through some Cold War history and then ...

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  • White Dwarfs & Planetary Nebulae: Crash Course Astronomy #30

    Today Phil follows up last week's look at the death of low mass stars with what comes next: a white dwarf. White dwarfs are incredibly hot and dense objects ...

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  • 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. Moons create gaps in ...

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  • Outtakes #4: Crash Course Astronomy

    Sometimes even Phil has a hard time with Astronomy. Time for another Bad Astronomy break! Crash Course Astronomy posters available at DFTBA.com ...

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  • Asteroids: Crash Course Astronomy #20

    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 ...

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  • Galaxies, part 2: Crash Course Astronomy #39

    Active galaxies pour out lots of energy, due to their central supermassive black holes gobbling down matter. Galaxies tend not to be loners, but instead exist in ...

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  • Naked Eye Observations: Crash Course Astronomy #2

    Today on Crash Course Astronomy, Phil invites you to head outside and take a look at all the incredible things you can see with your naked eye. -- Table of ...

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