Space
The Sun, the Moon, gravity and the weird stuff beyond. 21 ready to play, 0 coming soon.
What causes the seasons
It's not how close we are to the Sun. Tilt the Earth and see.
Why the Moon has phases
Walk the Moon around Earth and watch it wax and wane.
What causes the northern lights
Follow one particle from the Sun to a glowing sky.
How black holes form
Squeeze a dying star until not even light can escape.
How gravity works
Fire a cannon faster and faster until the ball falls around the Earth.
How stars form
Squeeze a cloud of gas until it lights up.
How the Big Bang happened
Run the universe backwards until everything is in one hot dot.
What causes an eclipse
Line up the Sun, Moon and Earth and cast the shadow yourself.
Where gold comes from
Crash two dead stars together and forge the gold in your ring.
How Earth was formed
Crash dust and rocks together until a glowing planet takes shape.
How light travels
Race a sunbeam across space, then bend it through glass.
Why Saturn has rings
Crumble a moon too close to a giant planet and spread it into rings.
Why Pluto isn't a planet
Check Pluto against the three rules astronomers voted on in 2006.
How the Moon formed
Smash a Mars-sized planet into the young Earth.
Why the Moon turns red
Slide Earth's shadow over the Moon and paint it with every sunset.
How planets form
Clump dust into pebbles, pebbles into planets, around a baby Sun.
Why stars twinkle
Look up through a wobbly ocean of air.
Why Mars is red
Rust a whole planet with a dusting of iron.
How astronauts sleep in space
Zip into a sleeping bag tied to the wall and float off to sleep.
What if Earth stopped rotating
Hit pause on the planet and see what happens.
Where helium comes from
Follow the gas in your balloon from deep underground.