Physics

Astronomy

Physics

In 46 episodes, Phil Plait (aka The Bad Astronomer) teaches you astronomy! This course starts with the astronomical observations we can make with the naked eye and expands out to cover the solar system, stars, galaxies, and the universe itself. The content is loosely based on an introductory university-level curriculum. By the end of this course, you will be able to: * Define the components of the universe, from the planets in the Solar System to dark energy and gamma rays * Understand how astronomers collect and analyze data to study the past and current state of the universe * Explain the difference between asteroids, comets, and meteors * Contextualize observed phenomena within scientific theories about the history and physics of space, such as the Big Bang theory

Year

2026

Duration

8h 57m

IMDb

0

Episodes

48

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Comments

10 comments

RAMONA MOUZ🇬🇦🇨🇬🇨🇩May 13, 2026

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. Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster If you want to learn more about the creation and death of the universe, watch Crash Course Big History here: https://youtube.com/playlist?list=PL8dPuuaLjXtMczXZUmjb3mZSU1Roxnrey -- Chapters: Introduction: The Expanding Universe 00:00 The Expansion of Space is Accelerating 2:17 What is Dark Energy? 4:19 Will the Universe Expand Forever? The Geometry of the Universe 5:20 The Cosmic Horizon of the Observable Universe 6:50 Review 10:20 -- GEOMETRY OF THE UNIVERSE RESOURCES Geometry: http://abyss.uoregon.edu/~js/cosmo/lectures/lec15.htm

merryrianaMay 13, 2026

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. Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster If you want to learn more about the creation and death of the universe, watch Crash Course Big History here: https://youtube.com/playlist?list=PL8dPuuaLjXtMczXZUmjb3mZSU1Roxnrey -- Chapters: Introduction: The Expanding Universe 00:00 The Expansion of Space is Accelerating 2:17 What is Dark Energy? 4:19 Will the Universe Expand Forever? The Geometry of the Universe 5:20 The Cosmic Horizon of the Observable Universe 6:50 Review 10:20 -- GEOMETRY OF THE UNIVERSE RESOURCES Geometry: http://abyss.uoregon.edu/~js/cosmo/lectures/lec15.htm

samzanarimalMay 13, 2026

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. Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster If you want to learn more about the creation and death of the universe, watch Crash Course Big History here: https://youtube.com/playlist?list=PL8dPuuaLjXtMczXZUmjb3mZSU1Roxnrey -- Chapters: Introduction: The Expanding Universe 00:00 The Expansion of Space is Accelerating 2:17 What is Dark Energy? 4:19 Will the Universe Expand Forever? The Geometry of the Universe 5:20 The Cosmic Horizon of the Observable Universe 6:50 Review 10:20 -- GEOMETRY OF THE UNIVERSE RESOURCES Geometry: http://abyss.uoregon.edu/~js/cosmo/lectures/lec15.htm

✅🇲🇦الأناني🇲🇦✅May 13, 2026

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. Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster If you want to learn more about the creation and death of the universe, watch Crash Course Big History here: https://youtube.com/playlist?list=PL8dPuuaLjXtMczXZUmjb3mZSU1Roxnrey -- Chapters: Introduction: The Expanding Universe 00:00 The Expansion of Space is Accelerating 2:17 What is Dark Energy? 4:19 Will the Universe Expand Forever? The Geometry of the Universe 5:20 The Cosmic Horizon of the Observable Universe 6:50 Review 10:20 -- GEOMETRY OF THE UNIVERSE RESOURCES Geometry: http://abyss.uoregon.edu/~js/cosmo/lectures/lec15.htm

Queen GMay 13, 2026

The big question in the comments last week was, "BUT WHAT ABOUT ECLIPSES?" Today, Phil breaks 'em down for you. This episode is sponsored by Squarespace: http://www.squarespace.com/crashcourse Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster -- As promised, Phil's sun spotting recommendations: Astronomers Without Borders (charitable org): http://store.astronomerswithoutborders.org/index.php?main_page=product_info&cPath=8&products_id=3 Rainbow Symphony glasses: http://www.rainbowsymphony.com/soleclipse.html Wide variety of viewers from Rainbow Symphony: http://www.eclipseglasses2017.com/buy-eclipse-glasses -- Chapters: Introduction 00:00 How Do Solar Eclipses Work? 0:52 Umbra & Penumbra 2:04 The Sun's Corona 3:17 Solar Eclipse Totality 4:14 Annular Eclipse 5:09 Can You Look at a Solar Eclipse? 5:32 Lunar Eclipses 6:54 Size of the Earth and Moon 8:24 Review 9:27 -- PBS Digital Studios: http://youtube.com/

user6517970722620May 13, 2026

The big question in the comments last week was, "BUT WHAT ABOUT ECLIPSES?" Today, Phil breaks 'em down for you. This episode is sponsored by Squarespace: http://www.squarespace.com/crashcourse Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster -- As promised, Phil's sun spotting recommendations: Astronomers Without Borders (charitable org): http://store.astronomerswithoutborders.org/index.php?main_page=product_info&cPath=8&products_id=3 Rainbow Symphony glasses: http://www.rainbowsymphony.com/soleclipse.html Wide variety of viewers from Rainbow Symphony: http://www.eclipseglasses2017.com/buy-eclipse-glasses -- Chapters: Introduction 00:00 How Do Solar Eclipses Work? 0:52 Umbra & Penumbra 2:04 The Sun's Corona 3:17 Solar Eclipse Totality 4:14 Annular Eclipse 5:09 Can You Look at a Solar Eclipse? 5:32 Lunar Eclipses 6:54 Size of the Earth and Moon 8:24 Review 9:27 -- PBS Digital Studios: http://youtube.com/

CreatorMikkiMay 13, 2026

The big question in the comments last week was, "BUT WHAT ABOUT ECLIPSES?" Today, Phil breaks 'em down for you. This episode is sponsored by Squarespace: http://www.squarespace.com/crashcourse Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster -- As promised, Phil's sun spotting recommendations: Astronomers Without Borders (charitable org): http://store.astronomerswithoutborders.org/index.php?main_page=product_info&cPath=8&products_id=3 Rainbow Symphony glasses: http://www.rainbowsymphony.com/soleclipse.html Wide variety of viewers from Rainbow Symphony: http://www.eclipseglasses2017.com/buy-eclipse-glasses -- Chapters: Introduction 00:00 How Do Solar Eclipses Work? 0:52 Umbra & Penumbra 2:04 The Sun's Corona 3:17 Solar Eclipse Totality 4:14 Annular Eclipse 5:09 Can You Look at a Solar Eclipse? 5:32 Lunar Eclipses 6:54 Size of the Earth and Moon 8:24 Review 9:27 -- PBS Digital Studios: http://youtube.com/

mostafa_sh_daw 🇲🇦🇩🇿❤️❤️May 13, 2026

The big question in the comments last week was, "BUT WHAT ABOUT ECLIPSES?" Today, Phil breaks 'em down for you. This episode is sponsored by Squarespace: http://www.squarespace.com/crashcourse Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster -- As promised, Phil's sun spotting recommendations: Astronomers Without Borders (charitable org): http://store.astronomerswithoutborders.org/index.php?main_page=product_info&cPath=8&products_id=3 Rainbow Symphony glasses: http://www.rainbowsymphony.com/soleclipse.html Wide variety of viewers from Rainbow Symphony: http://www.eclipseglasses2017.com/buy-eclipse-glasses -- Chapters: Introduction 00:00 How Do Solar Eclipses Work? 0:52 Umbra & Penumbra 2:04 The Sun's Corona 3:17 Solar Eclipse Totality 4:14 Annular Eclipse 5:09 Can You Look at a Solar Eclipse? 5:32 Lunar Eclipses 6:54 Size of the Earth and Moon 8:24 Review 9:27 -- PBS Digital Studios: http://youtube.com/

sfaruki076May 13, 2026

In today's episode, Phil looks at how gravity plays out across the universe. This episode is sponsored by Squarespace: http://www.squarespace.com/crashcourse Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster -- Chapters: Introduction 00:00 Understanding Mass 1:11 What is Gravity? 2:17 Different Types of Orbit 3:41 Escape Velocity 5:30 Why Are Astronauts Weightless? 7:03 Gravity Warps Space 8:17 Review 8:43 -- PBS Digital Studios: http://youtube.com/pbsdigitalstudios Follow Phil on Twitter: https://twitter.com/badastronomer Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: http://www.youtube.com/crashcoursekids -- PHOTO/VIDEO CREDIT

Sid'Ahmed AbdelahiMay 13, 2026

In today's episode, Phil looks at how gravity plays out across the universe. This episode is sponsored by Squarespace: http://www.squarespace.com/crashcourse Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster -- Chapters: Introduction 00:00 Understanding Mass 1:11 What is Gravity? 2:17 Different Types of Orbit 3:41 Escape Velocity 5:30 Why Are Astronauts Weightless? 7:03 Gravity Warps Space 8:17 Review 8:43 -- PBS Digital Studios: http://youtube.com/pbsdigitalstudios Follow Phil on Twitter: https://twitter.com/badastronomer Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: http://www.youtube.com/crashcoursekids -- PHOTO/VIDEO CREDIT