Crash Course – Astronomy – 46: Everything, The Universe, And Life

This is the forty-sixth and final video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video describes the search for exoplanets and how we would be able to detect life on other planets. Phil describes why we are unlikely to be visited, and why electronic communication is much more likely.

Crash Course – Astronomy – 45: Deep Time

This is the forty-fifth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video describes what astronomers and cosmologists think will happen in the deep future of the universe, stretching as much as 10^92 (100,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000) years into the future.

From the video description:

Table of Contents:

  • The Universe’s Days Are Numbered 0:32
  • Stars Eventually Die Out 3:02
  • Protons Eventually Decay 5:04
  • Bye-Bye Black Holes After 10^92 Years 7:49
  • With Death Comes Life 12:04

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

This is the forty-fourth video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video describes the beginnings of the universe from the big bang to the creation of the first atoms.

From the video description:

Table of Contents:

  • Mapping the History of the Universe Using Math and Observations 00:41
  • It Started With A Bang! 1:58
  • Rapid Expansion Smoothed Out Matter 4:55
  • Normal Matter Formed After 3-20 Minutes 5:12

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

This is the forty-third video of the Crash Course – Astronomy series, hosted by Dr. Phil Plait. This video explains why cosmologists think that an unknown form of energy exists, that it makes up the majority of the universe’s energy, and of what it might consist. It also covers the expansion of the spacetime, and the consequences for the observable universe.

From the video description:

Table of Contents:

  • Majority of the Universe is Made of Dark Energy 4:35
  • Dark Energy Accelerates the Expansion of Space 3:42
  • We Think The Universe Will Expand Forever 5:20

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