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 – 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

Crash Course – Astronomy – 31: High Mass Stars

This is the thirty-first video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video examines the progression and ends of stars with masses greater than nine times the mass of our sun.

From the video description:

Table of Contents:

  • Massive Stars Fuse Heavier Elements Up To Iron 1:15
  • Iron Uses High Amounts of Energy, Thus Making Stars Collapse 3:58
  • The Resulting Supernova Creates Even Heavier Elements 10:00
  • Relax, Something Else Will Kill You 9:04

Crash Course – Astronomy – 30: White Dwarfs & Planetary Nebulae

This is the thirtieth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video examines white dwarfs and planetary nebulae, the remains of low mass stars in old age.

From the video description:

Table of Contents:

  • When low mass stars die they form white dwarfs 0:54
  • White dwarfs are roughly the size of Earth 2:16
  • Cloudy with a chance of Planetary Nebulae 3:59
  • Life Span 9:06

Crash Course – Astronomy – 29: Low Mass Stars

This is the twenty-ninth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video describes the phases of life in low-mass stars, those with masses lower than about nine times that of our sun.

From the video description:

Table of Contents:

  • Low Mass Stars Live a Long Time 0:57
  • Larger Stars (Like Our Sun) Live Shorter Lives 3:10
  • Fueled By Fusion 3:58
  • How They Turn Into Red Giants 5:45

Crash Course – Astronomy – 26: Stars

This is the twenty-sixth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video describes the types of stars observed in the universe, and covers the HR diagram and the Main Sequence.

From the video description:

Table of Contents:

  • Stars Can Be Categorized Using Their Spectra 1:32
  • Spectra With Distance Can Identify Luminosity, Size, and Temperature 5:20
  • The HR Diagram Plots Luminosity vs Temperature 6:33
  • Most Stars Fall Along the Main Sequence 7:16

Crash Course – Astronomy – 24: Light

This is the twenty fourth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video explains how astronomers use light to observe and understand everything in the universe around us.

From the video description:

Table of Contents:

  • Light is a Form of Energy 0:39
  • Wavelength Tells Us Its Energy and Color 0:59
  • Spectroscopy 7:28

Crash Course – Astronomy – 10: The Sun

This is the tenth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video describes the structure and functioning of the enormous nuclear fusion reactor in our sky.

From the video description:

Table of Contents:

  • The Sun is a Star 1:28
  • Plasma’s Magnetic Fields 6:11
  • Sunspots, Solar Flares, and Coronal Mass Ejections 7:09
  • How the Earth Reacts 9:18