For the second time in 2025, an incredible astronomical event is about to change the seasons on Earth. The September equinox is almost upon us, with autumn about to begin in the Northern Hemisphere, ...

Scientists have discovered a 246 million-year-old marine reptile fossil, the oldest of its kind to be found in the Southern Hemisphere, shining a new light on the early evolution of marine mammals.

Day and night will get equal time for a brief moment Monday as much of the world heads into fall. The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere ...

Mercury is visible in the northwest evening sky in early July. Mars is visible all month, appearing reddish in color. Saturn is visible in the east after Mars sets, with its rings easily seen through ...

The weak spot, known as the South Atlantic Anomaly, was identified in the 19th century and expanded in recent years.

Saturday, Sept. 23, marks the first day of fall 2023 in the Northern Hemisphere. Saturday’s autumnal equinox marks the beginning of astronomical fall and the end of summer north of the equator. In the ...

In the Northern Hemisphere, the equinox symbolizes the onset of shorter days with longer, cooler nights, while in the ...