Season 1

    Video thumbnail: Crash Course Astronomy Life in the Universe: Crash Course Astronomy #46

    Crash Course Astronomy

    Life in the Universe: Crash Course Astronomy #46

    Phil gives the course a send off with a look at some of his favorite topics.

    Life in the Universe: Crash Course Astronomy #46

    Video thumbnail: Crash Course Astronomy A Brief History of the Universe: Crash Course Astronomy #44

    Crash Course Astronomy

    A Brief History of the Universe: Crash Course Astronomy #44

    Thanks to the wonders of physics, we can map a timeline of the universe’s history.

    A Brief History of the Universe: Crash Course Astronomy #44

    Video thumbnail: Crash Course Astronomy Dark Energy, Cosmology part 2: Crash Course Astronomy #43

    Crash Course Astronomy

    Dark Energy, Cosmology part 2: Crash Course Astronomy #43

    Most of the universe is made up of a mysterious entity that pervades space: dark energy.

    Dark Energy, Cosmology part 2: Crash Course Astronomy #43

    Video thumbnail: Crash Course Astronomy The Big Bang, Cosmology part 1: Crash Course Astronomy #42

    Crash Course Astronomy

    The Big Bang, Cosmology part 1: Crash Course Astronomy #42

    Thanks to observations of galaxy redshifts, we can tell that the universe is EXPANDING!

    The Big Bang, Cosmology part 1: Crash Course Astronomy #42

    Video thumbnail: Crash Course Astronomy Dark Matter: Crash Course Astronomy #41

    Crash Course Astronomy

    Dark Matter: Crash Course Astronomy #41

    Today on Crash Course Astronomy, Phil dives into some very dark matters.

    Dark Matter: Crash Course Astronomy #41

    Video thumbnail: Crash Course Astronomy Gamma-Ray Bursts: Crash Course Astronomy #40

    Crash Course Astronomy

    Gamma-Ray Bursts: Crash Course Astronomy #40

    The discovery of gamma-ray bursts is an epic story.

    Gamma-Ray Bursts: Crash Course Astronomy #40

    Video thumbnail: Crash Course Astronomy Galaxies, part 1: Crash Course Astronomy #38

    Crash Course Astronomy

    Galaxies, part 1: Crash Course Astronomy #38

    Galaxies contain gas, dust, and billions of stars or more.

    Galaxies, part 1: Crash Course Astronomy #38

    Video thumbnail: Crash Course Astronomy The Milky Way: Crash Course Astronomy #37

    Crash Course Astronomy

    The Milky Way: Crash Course Astronomy #37

    Today we’re talking about our galactic neighborhood: The Milky Way.

    The Milky Way: Crash Course Astronomy #37

    Video thumbnail: Crash Course Astronomy Nebulae: Crash Course Astronomy #36

    Crash Course Astronomy

    Nebulae: Crash Course Astronomy #36

    Astronomers study a lot of things, but nebulae might be the most beautiful of them all.

    Nebulae: Crash Course Astronomy #36

    Video thumbnail: Crash Course Astronomy Star Clusters: Crash Course Astronomy #35

    Crash Course Astronomy

    Star Clusters: Crash Course Astronomy #35

    Last week we covered multiple star systems, but what if we added thousands to the mix?

    Star Clusters: Crash Course Astronomy #35

    Video thumbnail: Crash Course Astronomy Binary and Multiple Stars: Crash Course Astronomy #34

    Crash Course Astronomy

    Binary and Multiple Stars: Crash Course Astronomy #34

    Binary stars are gravitationally bound together in the same system.

    Binary and Multiple Stars: Crash Course Astronomy #34

    Video thumbnail: Crash Course Astronomy Black Holes: Crash Course Astronomy #33

    Crash Course Astronomy

    Black Holes: Crash Course Astronomy #33

    Stellar mass black holes form when a very massive star dies, and its core collapses.

    Black Holes: Crash Course Astronomy #33

    Video thumbnail: Crash Course Astronomy Neutron Stars: Crash Course Astronomy #32

    Crash Course Astronomy

    Neutron Stars: Crash Course Astronomy #32

    In the aftermath of a some stars we find a weird little object known as a neutron star.

    Neutron Stars: Crash Course Astronomy #32

    Video thumbnail: Crash Course Astronomy High Mass Stars: Crash Course Astronomy #31

    Crash Course Astronomy

    High Mass Stars: Crash Course Astronomy #31

    Massive stars fuse heavier elements in their cores than lower mass stars.

    High Mass Stars: Crash Course Astronomy #31

    Video thumbnail: Crash Course Astronomy Low Mass Stars: Crash Course Astronomy #29

    Crash Course Astronomy

    Low Mass Stars: Crash Course Astronomy #29

    Today we are talking about the life -- and death -- of stars.

    Low Mass Stars: Crash Course Astronomy #29

    Video thumbnail: Crash Course Astronomy Brown Dwarfs: Crash Course Astronomy #28

    Crash Course Astronomy

    Brown Dwarfs: Crash Course Astronomy #28

    Brown dwarfs have a mass that places them between giant planets and small stars.

    Brown Dwarfs: Crash Course Astronomy #28

    Video thumbnail: Crash Course Astronomy Exoplanets: Crash Course Astronomy #27

    Crash Course Astronomy

    Exoplanets: Crash Course Astronomy #27

    There are many other planets outside of our own solar system, but finding them is tricky.

    Exoplanets: Crash Course Astronomy #27

    Video thumbnail: Crash Course Astronomy Stars: Crash Course Astronomy #26

    Crash Course Astronomy

    Stars: Crash Course Astronomy #26

    Phil explains stars and how they can be categorized using their spectra.

    Stars: Crash Course Astronomy #26

    Video thumbnail: Crash Course Astronomy Distances: Crash Course Astronomy #25

    Crash Course Astronomy

    Distances: Crash Course Astronomy #25

    How do astronomers make sense out of the vastness of space?

    Distances: Crash Course Astronomy #25

    Video thumbnail: Crash Course Astronomy Light: Crash Course Astronomy #24

    Crash Course Astronomy

    Light: Crash Course Astronomy #24

    In order to understand more of universe, we need to talk a little bit about light.

    Light: Crash Course Astronomy #24

    Video thumbnail: Crash Course Astronomy Meteors: Crash Course Astronomy #23

    Crash Course Astronomy

    Meteors: Crash Course Astronomy #23

    What the difference between a meteor, meteorite, and meteoroid?

    Meteors: Crash Course Astronomy #23

    Support for PBS.org provided by: