Last year, astronomers discovered an unusual Earth-size exoplanet they believe has a hemisphere of molten lava, with its ...

Atomic clocks are more accurate than those used to define the second, suggesting the definition might need to change ...

Tired of driving home from a hard day's work in darkness? You're in luck because daylight saving time is slated to start next month.

Astronomically speaking, the first day of spring is marked by the spring equinox, which always happens on March 19, 20 or 21.