WEBVTT

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[MUSIC]

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Student: My question is how fast
is the fastest robot?

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Tom McCarthy: Well, it turns out
there is actually some pretty

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fast robots out there.
There's actually a running

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robot, a cheetah, a robot that's
faster than Usain Bolts.

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So, over 28 miles an hour.
Student: My question is why are

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moon rovers and mars rovers so
slow?

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McCarthy: So the reason why the
Moon and Mars rovers is so slow

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is because they have to carry
all of their energy on board

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through batteries, or they have
to convert, uh, electrical power

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from the sun in some cases and
store it.

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And they go slow to conserve
that energy.

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They don't, if they go really
fast they'll burn up all their

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energy quickly, and then it
takes a long time for them to

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charge.
So they meter out their

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performance over a long period
of time.

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Joan Cartan-Hansen: For more
information about robotics,

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check out the science trek
website.

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You'll find it at science trek
dot org