There are other sources of heat on the Earth's surface, such as lava flows and forest fires. Instruments onboard Earth observing satellites can sense this emitted infrared radiation and use the resulting measurements to study changes in land and sea surface temperatures. This heat is emitted from Earth in the form of infrared radiation. As incident solar radiation hits Earth, some of this energy is absorbed by the atmosphere and the surface, thereby warming the planet. Earth scientists study infrared as the thermal emission (or heat) from our planet. To astrophysicists studying the universe, infrared sources such as planets are relatively cool compared to the energy emitted from hot stars and other celestial objects. Credit: NASA, ESA, and the Hubble SM4 ERO Team MONITORING THE EARTH
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