- all ojects emit and absorb infrared radiation, the hotter an object is, the more infrared radiation it emits in a given time
- blackbody radiation is radiation emitted by a body that absorbs all the radiation incident on it
- it is part of the electromagnetic spectrum, longer in wavelength than visible light waves
- Earth's atmosphere doesn't block out infrared radiation or light from sun
- the temperature of an object increases if it absorbs more radiation than it emits
- the Earth's temperature depends on a lot of factors, including the absorption of infrared radiation from Sun, and the emission of radiation from the Earth's surface and atmosphere
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