Solar physicists predict another weak 11-year solar cycle ahead. At the same time, they expect the coming cycle to break the trend of weakening solar activity seen over the past 4 cycles, and they add there's "no indication we are currently approaching a Maunder-type minimum in solar activity."

For the first time, an in-situ measurement of methane on Mars - made by NASA's Curiosity rover - has been independently confirmed from orbit, by ESA's Mars Express. Could it be a clue to Mars life?

The discovery of fossilized microbes in Martian meteorites has been claimed before. Now scientists in Hungary add a new study of the ALH-77005 meteorite, with some intriguing new evidence.

Watch Mars' moons Phobos and Deimos cross the sun in a pair of solar eclipses last month, in these animations made from images from the Curiosity rover's cameras.

The star is a white dwarf, a cool, dead, dense star like our sun some 6 billion years from now. The planet fragment - made of heavy metals - survived a system-wide cataclysm that followed the star's death.

Mars is a cold, dry desert, but a new study provides tantalizing evidence for liquid water deep below its surface. If it exists, this Mars groundwater might cause the weird dark streaks in Martian craters and canyons.

These images from ESA's ExoMars orbiter show Mars in all of its diverse geological wonder. Also, if you look carefully, you can spy NASA's newest Mars mission, the InSight lander!

Dark matter theory - the idea that a huge fraction of our universe exists in a form we can't see - is a cornerstone of modern cosmology. Ironically, galaxies lacking dark matter might help confirm the theory.

A small asteroid - now designated as 2019 FC1 - flew closer to us than the moon on March 28, 2019. Astronomers detected it 1 day later. It's the largest of 14 asteroids to pass closer to us than the moon since 2019 began.

New findings from Cassini - which orbited Saturn from 2004 to 2017 - confirm that dust and ice from Saturn's rings accumulate on moons orbiting in the rings' vicinity.