The equatorial regions of Mars are home to unexpectedly enormous layers of ice, and they may have been put there by dramatic ...

The autumn equinox is now upon us! Today marks the moment that the sun crosses the celestial equator, ushering in the beginning of astronomical autumn in the northern hemisphere, which brings with it ...

The autumn equinox marks the end of summer and the beginning of fall in the Northern Hemisphere. In 2025, the first day of fall will be Monday, Sept. 22. During the equinox, the sun crosses directly ...

Fall is coming to Arizona as the autumnal equinox arrives on September 22, 2025. The equinox brings nearly equal day and night, marking the start of cooler mornings and shorter days. Summer officially ...