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

This is the forty-second video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video covers the discovery of the beginning of the universe in the Big Bang, and the Cosmic Microwave Background.

From the video description:

Table of Contents:

  • Distant Galaxies Show a Red Shift in Their Spectra 2:07
  • The Universe is Expanding 2:51
  • This Model is Called “The Big Bang” 5:12
  • The Universe is Almost 14 Billion Years Old 11:43

Crash Course – Astronomy – 41: Dark Matter

This is the forty-first video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video describes how the effects of “dark matter” have been observed in recent decardes, and the efforts to map dark matter in the universe.

From the video description:

Table of Contents:

  • Normal and Dark Matter 0:55
  • Dark Matter Only Interacts With Normal Matter Through Gravity 4:27
  • Dark Matter Bends Light 5:08

Crash Course – Astronomy – 40: Gamma-Ray Bursts

This is the fortieth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video describes the history of the discovery of gamma rays, and how astronomers learned their sources in the universe.

From the video description:

Table of Contents:

  • Gamma-Ray Were Discovered During the Cold War 0:47
  • Bursts Come in Two Varieties: Long and Short 8:35
  • Long Bursts Are From Hypernovae, Massive Stars Exploding 6:46
  • Short Ones Are From Merging Neutron Stars 9:00
  • Both Are The Birthplace of Black holes 9:55

Crash Course – Astronomy – 39: Galaxies, Part 2

This is the thirty-ninth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video discusses active galaxies, quasars, the massive black holes at the center of galaxies, and galaxy clusters.

From the video description:

Table of Contents:

  • Black Holes at the Center of Galaxies 2:26
  • Galaxies Are a Part of Small/Large Clusters 9:47
  • The Milky Way is Part of the Local Group 6:45
  • Galaxy Clusters Clump Together to Create Superclusters 11:03
  • Hundreds of Billions of Galaxies 12:39

Crash Course – Astronomy – 38: Galaxies, Part 1

This is the thirty-eighth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video discusses how galaxies were discovered and measured, and describes the four main shapes of galaxies.

From the video description:

Table of Contents:

  • Milky Way is a Galaxy (One of Many) 2:04
  • Galaxies Have Four Main Shapes 3:18
  • Galaxies Can Collide 6:05

Crash Course – Astronomy – 37: The Milky Way

This is the thirty-seventh video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video examines the galaxy we call our home, the Milky Way.

From the video description:

Table of Contents:

  • Milky Way Is A Disc 2:54
  • Grand Spiral Patterns 4:21
  • The Central Region Is Bar Shaped 7:48
  • Outer Halo Of Old Stars 9:09

Crash Course – Astronomy – 36: Nebulae

This is the thirty-sixth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video takes a closer look at emission and reflection nebulae.

From the video description:

Table of Contents:

  • Nebulae Are Clouds of Gas And/Or Dust 0:42
  • They Can Emit Light Or Reflect It 1:20
  • Elements Change Their Glow 3:31
  • Nebulae Can Create Stars 5:28

Crash Course – Astronomy – 35: Star Clusters

This is the thirty-fifth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video describes the formation and evolution of star clusters, and give details on examples in the sky. It covers both open clusters and globular clusters.

From the video description:

Table of Contents:

  • Open clusters contain hundreds or thousands of young stars 00:29
  • Over time, open clusters evaporate 3:23
  • Globular clusters contain hundreds of thousands of old stars in spherical formation 5:50
  • Globular clusters have less heavy elements, thus probably do not have planets 6:43

Crash Course – Astronomy – 34: Binary and Multiple Stars

This is the thirty-fourth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video examines star systems that include two or more partners.

From the video description:

Table of Contents:

  • What are binary stars? 0:51
  • Merging peanut-shaped stars 6:52
  • Close binaries begin to flow into one another, sometimes blowing up the star 8:29

Crash Course – Astronomy – 33: Black Holes

This is the thirty-third video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video examines the requirements for a star forming a black hole, and how black hole behave.

From the video description:

Table of Contents:

  • How Stellar Mass Black Holes Are Formed 1:03
  • The Core 1:43
  • Nothing Can Escape Once It’s Inside 2:29
  • Gravity Intensifies The Closer You Get 3:33
  • Spaghettification 6:01
  • Time Will Slow Down Near A Black Hole 8:01