What is a Black Hole? – Stephen Hawking’s final theory

We want to thank Google’s science journal app for supporting PBS Digital Studios black holes they’re weird In a recent paper about them seems to me to be the strangest one yet black holes might be covered in hair I’m Diana you’re watching physics girl It’s been a while since I made a YouTube video […]

What’s the difference between a solar and lunar eclipse?

you forget the difference between a solar and lunar eclipse – one looks like this and the sunny day suddenly becomes dark and the other is a full moon that gets darker and darker a lunar eclipse is when the moon is blocking the light from the Sun wait a minute No I changed my […]

SUNSCREEN in UV

Thanks to Curiosity Stream for supporting PBS Digital Studios. It looks like I’m wearing really bad tanning oil. Hey, I’m Dianna. You’re watching Physics Girl. Just relaxing here in the shade on this beautiful summer day. Isn’t that right, Derek? Yeah, that’s right. OK, but you’re not even in this video yet, so you just […]

Are perpetual motion machines possible?

[MUSIC PLAYING] What if I told you I built a machine that creates energy? My ingenious design works like this. As the wheel turns, the coins fall in the slots so that one side of the wheel is always heavier than the other, which would keep pulling that side down, and the wheel would never […]

Spaceships pushed by LIGHT – the future of space travel?

DIANNA COWERN: This episode is brought to you by Squarespace. Squarespace, build it beautiful. Imagine a spacecraft with a huge, shiny sail attached, like a kite, accelerating through space. But there’s no wind in space. This sail ship is pushed by sunlight. Think about it. Photons, or particles of light, have no mass, and yet […]