A 1,000-mile cloud on Mars may reveal physics never seen in nature
Summary
Scientists have studied a very long cloud on Mars called the Arsia Mons Elongated Cloud (AMEC) that appears each spring and summer near the Arsia Mons volcano. Their new computer model shows the cloud forms through a rare process called homogeneous nucleation, where water vapor turns directly into ice without needing dust or particles, a phenomenon never seen before in a planet’s atmosphere.Key Facts
- The Arsia Mons Elongated Cloud is over 1,000 miles long and appears repeatedly during Martian spring and summer.
- The cloud forms near the Arsia Mons volcano, which is about 65,000 feet tall.
- Scientists used simulations including unusual physics theories to successfully model how this cloud forms.
- The cloud forms by homogeneous nucleation, meaning ice crystals form directly from vapor without particles helping.
- This process requires a huge temperature drop and very high humidity, conditions rarely seen anywhere else.
- Winds hitting the tall volcano push moist air high into Mars’ atmosphere, creating the right conditions for the cloud.
- Such humidity levels on Mars are much higher than any moisture found on Earth’s atmosphere.
- This discovery might help scientists understand similar atmospheric phenomena on other planets, like Venus or Earth.
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