🧠 DISCOVER SPACE IN 5 MINUTES
Five questions, one minute each. Tap a card, see the answer, then try it yourself.
How big is Earth?Tap for the answer
12,742 km across. About 1,300 Earths would fit inside Jupiter.
Try it yourself →How fast is the ISS?Tap for the answer
About 27,600 km/h: once around Earth every 90 minutes.
Try it yourself →How long does sunlight take to reach us?Tap for the answer
8 minutes 20 seconds on average. The Sun you see is the Sun of 8 minutes ago.
Try it yourself →Where are we in the Milky Way?Tap for the answer
About 26,000 light years from the centre, in the Orion Arm. The Sun circles the galaxy roughly once every 230 million years.
Try it yourself →How big are Saturn’s rings?Tap for the answer
The main rings span about 270,000 km, yet in most places they are only 10 m to 1 km thick.
Try it yourself →🏅 Space explorer! You discovered all five.
How far away is everything right now?
Real distances for this second. Press send and watch one pulse of light crawl out to each world at its real speed, sped up so a whole hour fits in twelve seconds.
What is fast out here?
Every bar is a real speed measured right now. Each one races the same stretch: Earth to the Moon. The clock speeds up as it runs, so watch the elapsed time, not the bars.
Real worlds, real imagery
Globes built from NASA mission maps, spinning in your browser.
Maps: NASA Blue Marble, NASA LRO, USGS Viking, NASA/JPL Cassini.
Hubble Deep Field
Almost every speck is a whole galaxy. This patch of sky is smaller than a tennis ball seen from 100 metres away.
Credit: NASA, STScICompare sizes
Pick something you know, then see how everything else measures up against it.