Comets • 2014 • episode "6/6" • Strip the Cosmos

58:33

Beginning with the separation of the fuzzy thinking and pious fraud of astrology from the careful observations of astronomy, Sagan follows the development of astronomical observation. Beginning with constellations and ceremonial calendars (such as those of the Anasazi), the story moves to the debate between Earth and Sun-centered models: Ptolemy and the geocentric worldview, Copernicus' theory, the data-gathering of Tycho Brahe, and the achievements of Johannes Kepler (Kepler's laws of planetary motion and the first science-fiction novel).

3/13 • Cosmos: A Personal Voyage • 1980 • Astronomy

6:20

What is dark energy? What is dark matter? Well, if we knew exactly we would have a nobel prize – we know that they exist though. So what do we know about those strange things?

In a Nutshell • 2015 • Astronomy

57:54

The final episode shows how the unique properties of light provide an insight into the origins and development of mankind and the Universe.

4/4 • Wonders of the Universe • Astronomy

47:03

Of all life on Earth, we're the only ones with the smarts to leave our planet. How did our planet make us so intelligent? Astronaut host – Leland Melvin.

9/10 • One Strange Rock • 2018 • Astronomy

11:54

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. We’ve visited comets up close and found them to be lumpy, with vents in the surface that release the gas as ice sublimates. Eons ago, comets (and asteroids) may have brought a lot of water to Earth -- as well as the ingredients for life.

21 • Crash Course Astronomy • 2015 • Astronomy

47:02

For nearly 4 billion years, life has sculpted almost every part of Earth. But how exactly did life turn this once barren rock into a paradise? Astronaut host – Mike Massimino.

7/10 • One Strange Rock • 2018 • Astronomy