00:01On this day in space.
00:03In 1999, NASA launched its flagship Terra satellite into Earth's orbit
00:07to collect data about our planet's changing climate.
00:10Terra contains five different sensors that monitor the Earth's atmosphere,
00:13lands, oceans, and radiant energy.
00:15The satellite takes several different kinds of measurements
00:18that reveal how the Earth is changing over time.
00:20It also tracks the spread of air pollution.
00:23It lifted off from Vandenberg Air Force Base in California
00:26on a United Launch Alliance Atlas II rocket and is still in operation today.
00:30And that's what happened on this day in space.
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