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Strange Universe With Bob Berman

Strange Universe

Milestone events

By Bob Berman

Published September 22, 2024 at 12:41 PM EDT

1 of 1 — NASA SU 9-22.jpg

NASA

Equinoxes are milestone events on other planets too, but not on Mercury, which is the only planet that moves through space straight up and down, with no axial tilt. Since amount of tilt determines the severity of seasons, Mercury has none, period. It's the only world with a permanent equinox.

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