Ask Dr. Universe

Why do cheetahs run fast? –Shanyu, 9, London, UK.

Dear Shanyu,

Cheetahs are in really good shape. Not only are they good runners, but the actual shape of their body helps them move at incredible speeds.

As the fastest cats on the planet, they can reach 75 mph. Whenever I lace up my shoes and run, I can only reach about 30 mph. We tabby cats are pretty quick, but not quick enough to outrun a cheetah.

The difference has to do with a cheetah’s amazing anatomy – everything from its head and skeleton to its muscles and feet.

That’s what I found out from my friend Bethany Richards. She studies veter...