PBS
What Happens at the Event Horizon?
What really happens when you approach the event horizon of a black hole?
MinutePhysics
The Twins Paradox Hands-On Explanation | Special Relativity Ch. 8
This video is chapter 8 in my series on special relativity, and it presents a hands-on explanation of the resolution to the Twins Paradox using the mechanical minkowski diagram, aka mechanical Lorentz transformation, aka spacetime globe....
SciShow
The Lost Cargo Ship, and Pluto Has Ice Caps!
SciShow Space News explains how we lost track of a resupply mission, explores Pluto’s newfound ice caps, and helps you find Mercury.
SciShow
IDTIMWYTIM Equinox Stupid Latin
In this edition of IDTIMWYTIM, Hank explains why the common understanding of "equinox" is wrong, what the equinox actually is, and then rages a little against astronomers and their stupid confusing Latin terms.
TED Talks
TED: Cloudy with a chance of joy | Gavin Pretor-Pinney
You don't need to plan an exotic trip to find creative inspiration. Just look up, says Gavin Pretor-Pinney, founder of the Cloud Appreciation Society. As he shares charming photos of nature's finest aerial architecture, Pretor-Pinney...
Be Smart
The Equinox Isn't What You Think It Is
Is the equinox really when day = night, or is that a myth?
TED Talks
TED: Never, ever give up | Diana Nyad
In the pitch-black night, stung by jellyfish, choking on salt water, singing to herself, hallucinating … Diana Nyad just kept on swimming. And that's how she finally achieved her lifetime goal as an athlete: an extreme 100-mile swim from...
TED-Ed
TED-ED: The myth of Oisin and the land of eternal youth - Iseult Gillespie
In a typical hero's journey, the protagonist sets out on an adventure, undergoes great change and returns in triumph to their point of origin. But in the Irish genre of myth known as echtrai, the journey to the otherworld ends in a point...
SciShow
Its True The Sun Really Does Flash Green
The mythical green flash at sunset isn't actually a myth! Stefan explains why it happens, and how you can see it.
SciShow
The Universe Is Expanding... But Not Everywhere
The Universe is expanding which means distant galaxies are only moving farther away from us. So in the farthest future, will our night sky be empty?
TED-Ed
TED-Ed: Why do cats have vertical pupils? | Emma Bryce
Peering into the eyes of different animals, you'll see some extraordinarily shaped pupils. House cats, for one, are twilight hunters with vertically elongated pupils. Many grazing animals, like goats, have rectangular pupils. Other...
SciShow
Eclipses That Don't Eclipse
Here on Earth, we’re used to seeing both lunar and solar eclipses. But further out are eclipses that don’t behave at all the way we expected them to.
TED-Ed
TED-Ed: The moon illusion - Andrew Vanden Heuvel
Have you noticed how the full moon looks bigger on the horizon than high overhead? Actually, the two images are exactly the same size -- so why do we perceive them differently? Scientists aren't sure, but there are plenty of intriguing...
Crash Course
Deep Time
As we approach the end of Crash Course Astronomy, it’s time now to acknowledge that our Universe’s days are numbered. Stars will die out after a few trillion years, protons will decay and matter will dissolve after a thousand trillion...
TED-Ed
The incredible, bendable, twistable, expandable elephant trunk | Chase LaDue and Bruce A. Schulte
As a breeze blows through the savannah, a snake-shaped tube stretches into the air and scans the horizon like a periscope. But it's not seeing— it's sniffing. Containing no bones and an estimated 40,000 muscles, an elephant trunk is one...
MinutePhysics
TOP 10 REASONS Why We Know the Earth is Round
TOP 10 REASONS Why We Know the Earth is Round
SciShow
6 Creative Ways People Used to Navigate the Oceans
People have been exploring the oceans since prehistoric times, way before they had GPS to help them figure out where they were. Here are 6 ingenious ways our ancestors navigated the oceans.
PBS
What Happens At The Edge Of The Universe?
Lots of people believe the Universe is infinite, but there's a good possibility that might not be the case. Which means that there would be an actual edge of the Universe. What happens at that edge? Is there a restaurant?
Crash Course
The Moon
Join Phil for a tour of our capital-M Moon, from surface features, inside to the core, and back in time to theories about its formation.
Crash Course
What is Soil (and Why is it Important)?: Crash Course Geography
Soil brings together all four spheres of physical geography, and understanding soil composition is kind of like baking! So in today's episode, we're going to show you how to create the perfect soil cake, examine its different soil...
SciShow
The Weird Optical Illusion that Changes the Moon's Size
The full moon might seem bigger on the horizon than when it's higher up, but when does it actually take up more space in the sky?
Crash Course
Black Holes
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...
Bozeman Science
Soil and Soil Dynamics
In this video Paul Andersen explains how soils are formed and classified. Weathering of rock creates particles which are mixed with water, air, and organic material. Soils are classified according to particle size, chemical makeup, and...