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#EarthDayAtHome with Optical Engineer Mark Helmlinger

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Scientific instruments can "see" in ways our eyes can't. Mark Helminger builds and travels with remote sensing instruments that can measure chemistry, moisture and more on Earth and other planets. He shows us how the types of light we can see -- and the ones we can't -- help us understand our planet.

We're observing Earth Day from home this year. Whether we're curled up on the couch or in the microgravity on the International Space Station, there's a way to appreciate our little rock in space.

Video edited by Matt Radcliff USRA/NASA GSFC
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