SpeedrooGuessroo · All speeds

How fast did Sputnik 1 orbit?

28,800 km/hAbout 17,900 mph · Orbit

About 8 km a second, circling Earth every 96 minutes.

That's about 510 times a red kangaroo's top speed (56 km/h).

28,800 km/h
sound in helium

By speed: Sputnik 1 is about 8.3× faster than sound in helium.

Think you can guess? Play today's Speedroo

Things about as fast

Many real things vary, so we use a typical or official figure. Spotted a mistake? Email [email protected].