10K views · 410 reactions |  T-46 days until #EarthDay50 Computer models of our atmosphere rely on observed measurements from satellites, airplanes and weather balloons. As computer power has improved, so has our number of observations -- from 175,000 in a six hour period in 1980 to about 5 million in the same period now. https://go.nasa.gov/2VVcr4D | NASA Earth | Facebook