Solved cryptogram
Earth stays at a livable temperature by radiating back to space almost all the sunlight it takes in.
Earth Science Facts, sourced to NASA.
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What it means
Energy arrives as visible light and leaves as infrared, and the two have to balance or the planet warms or cools until they do. Greenhouse gases absorb some of the outgoing infrared and re-radiate part of it downward, which raises the surface temperature needed to push the same amount of heat out. Without any of them at all, Earth's average surface would be well below freezing.
The claim comes from NASA.
- SourceNASA
- CollectionEarth Science Facts
- Difficultymedium
- Length82 letters, 20 unique
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