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When you hear that it's 
time to study wanderers, 
do you grab your telescope

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or your microscope?

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Here at NASA, the answer
could be both.

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The names of two things
we study -- planets and
plankton --

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come from the same 
Greek root word planetes,
which means wanderer.

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They're both named for
their tendency to move,

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although at vastly
different scales.

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We can watch other planets
in our solar system move 
across our night

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sky because they orbit
the Sun at different 
speeds than Earth.

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Plankton, on the other hand,
are tiny ocean organisms

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that move through the water
to feed or photosynthesize.

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Plankton are responsible
for the largest migration
on Earth,

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sinking deeper into
the ocean at night

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and then rising back closer to
the surface where there's more
sunlight by day.

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At NASA, we have whole
missions dedicated to 
studying other planets

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in our solar system
and even those around
other stars.

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We're also gearing
up to launch PACE,
a satellite

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that will study plankton
to better monitor
the health of our ocean
and our planet.