Crash Course Astronomy

Science and Nature Series / 1 Season

Welcome to school without the classroom! Join host Phil Plait and discover everything there is to know about the cosmos.

12m 11s

Dark Matter: Crash Course Astronomy #41

S1 E41 / 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.

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

S1 E42 / 13m 9s

Thanks to observations of galaxy redshifts, we can tell that the universe is EXPANDING! Knowing that the universe is expanding and how quickly its expanding also allows us to run the clock backwards 14 billion years to the way the universe began - with a bang.

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

S1 E43 / 11m 8s

The majority of the universe is made up of a currently mysterious entity that pervades space: dark energy. We don’t know exactly what it is, but we do know that dark energy accelerates the expansion of space. We think this means the Universe will expand forever, even as our view of it shrinks while space expands faster all the time.

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

S1 E44 / 12m 21s

Thanks to the wonders of physics, astronomers can map a timeline of the universe’s history. Today, Phil’s going to give you an overview of those first few minutes (yes, MINUTES) of the universe’s life. It started with a Big Bang, when the Universe was incredibly dense and hot.

Life in the Universe: Crash Course Astronomy #46

S1 E46 / 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.

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