Why the Solar System may sit in a relatively calm part of the Milky Way

Earth’s part of the Milky Way may be unusually calm

The Solar System stays mostly between the Milky Way’s main spiral arms instead of often crossing them. Spiral arms contain more supernovae, radiation, and strong gravitational effects, so staying between them may have given life longer periods of relative stability.

Cold, salty seawater can sink through the ocean

Seawater gets heavier when it becomes colder or saltier. In places where surface water becomes cold and salty enough, it sinks beneath the water around it and helps drive deep ocean currents.

India’s mountains and desert help shape its rainfall

The Himalayas block cold winds from Central Asia, helping keep much of India warmer. The Thar Desert helps pull in wet summer winds from the ocean, bringing the monsoon rains that provide most of India’s rainfall from June through October.

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Why the Solar System may sit in a relatively calm part of the Milky Way

Earth’s part of the Milky Way may be unusually calm

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