00:00 On this day in space.
00:03 In 1999, NASA launched its flagship Terra satellite into Earth's orbit to collect data about our planet's changing climate.
00:09 Terra contains five different sensors that monitor the Earth's atmosphere, lands, oceans, and radiant energy.
00:15 The satellite takes several different kinds of measurements that reveal how the Earth is changing over time.
00:20 It also tracks the spread of air pollution.
00:23 It lifted off from Vandenberg Air Force Base in California on a United Launch Alliance Atlas II rocket and is still in operation today.
00:30 And that's what happened on this day in space.
00:33 [music]
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