The Fleeting Grace of the Habitable Zone • 2020 • episode "2/13" • Cosmos: Possible Worlds

42:04

Astronomers are laying the groundwork to locate a new planet for the human race to inhabit, and the more alien worlds they discover and encounter, the more they unmask the mysterious and truly destructive nature of the cosmos.

S8E1 • Space's Deepest Secrets • 2021 • Astronomy

18:02

There’s an absolute limit to our access to the universe beyond our own galaxy. There’s a limit to what we can ever hope to explore or send signals to, and a very different limit to what we can ever hope to witness. Today we’re going to explore the latter. We’re going to figure out the absolute limit of our future view of the universe, and of the universe’s ability to influence us. Next time we’ll turn it around and ask: how much of the external universe can WE potentially influence, and even explore?

PBS Space Time • 2023 • Astronomy

10:40

Today Phil’s explaining the stars and how they can be categorized using their spectra. Together with their distance, this provides a wealth of information about them including their luminosity, size, and temperature. The HR diagram plots stars’ luminosity versus temperature, and most stars fall along the main sequence, where they live most of their lives.

26 • Crash Course Astronomy • 2015 • Astronomy

12:25

We’ve covered a lot of incredible stuff, but this week we’re talking about the weirdest objects in space: BLACK HOLES. Stellar mass black holes form when a very massive star dies, and its core collapses. The core has to be more than about 2.8 times the Sun’s mass to form a black hole. Black holes come in different sizes, but for all of them, the escape velocity is greater than the speed of light, so nothing can escape, not matter or light. They don’t wander the Universe gobbling everything down around them; their gravity is only really intense very close to them. Tides near a stellar mass black hole will spaghettify you, and time slows down when you get near a black hole — not that this helps much if you’re falling in.

33 • Crash Course Astronomy • 2015 • Astronomy

93:01

From director Todd Douglas Miller comes a cinematic event fifty years in the making. Crafted from a newly discovered trove of 65mm footage, and more than 11,000 hours of uncatalogued audio recordings, Apollo 11 takes us straight to the heart of NASA’s most celebrated mission—the one that first put men on the moon, and forever made Neil Armstrong and Buzz Aldrin into household names. Immersed in the perspectives of the astronauts, the team in Mission Control, and the millions of spectators on the ground, we vividly experience those momentous days and hours in 1969 when humankind took a giant leap into the future.

2019 • Astronomy

44:01

There’s a reason rocket science is used as a benchmark for difficulty. See why as we examine great liftoff disasters.

S1E6 • Space Disasters • 2020 • Astronomy