LEAD: A new NASA camera keeping a steady eye on the sunlit side of Earth is yielding new insights about our changing planet.
1. The camera is onboard a satellite a million miles out in space.
2. A second instrument measures the total amount of solar energy that reflects off Earth, as well as the heat emitted from our planet, filling in missing pieces of energy information not observed by other satellites.
TAG: These reflectance measurements will help scientists study Earth's changing climate.