Samples drilled by the Curiosity rover on Mars have revealed abundant signs of a carbon cycle that remained hidden from orbital scans, alongside clues of how life may have been wiped out on the planet.

The rete ovarii, a poorly understood structure connected to the ovaries, may be much more essential to ovarian function than scientists initially thought.

New research suggests that the unexpected intensity of the ongoing solar maximum may be partly tied to a lesser-known, 100-year solar cycle. If true, solar activity could spike further in the coming decades. But some experts are skeptical.

Roughly 20 "shooting stars" per hour may be visible during the peak of the Lyrid meteor shower overnight on Monday, April 21-22.

The land beneath the former Aral Sea in Kazakhstan and Uzbekistan is rising and will continue to do so for many decades. Now, scientists have an explanation that involves the sea drying up.

Scientists have discovered evidence of large quantities of biosignature chemicals — only known to be made by life on Earth — on an exoplanet more than 100 light-years away. It could be the most promising sign yet of alien life.