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What is an atmosphere on a planet?
Quick Answer
A planet’s atmosphere is the layer of gases surrounding it, held by gravity.
The Full Story
Atmospheres vary enormously across the Solar System. Earth’s atmosphere is nitrogen- and oxygen-rich, while Venus has a thick carbon dioxide atmosphere and Mars has a thin one. Jupiter and Saturn have huge gas envelopes dominated by hydrogen and helium. An atmosphere can support weather, transfer heat, and sometimes protect a surface from radiation and impacts.
Key Facts
1.Earth’s atmosphere is mostly nitrogen and oxygen
2.Venus has a dense carbon dioxide atmosphere
3.Mars has a very thin atmosphere
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Suggested video title for this topic:
"Why do some worlds have skies, weather, and breathable air — and others don’t?"
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