The surface of Venus may have remained extremely hot since its formation, meaning that water in the atmosphere never had a chance to fall to the surface
Lunar samples brought back to Earth by the Chang’e 5 spacecraft seem to be less than 2 billion years old, meaning the moon had volcanic activity more recently than researchers expected
Mars used to have flowing water, which filled Jezero crater with an enormous lake. Images of cliff faces taken by NASA’s Perseverance rover show the lake used to flood 3.7 billion years ago
A white dwarf about 90 light years from Earth is so cool and dim it should be about 10 billion years old – but the area it lies in is thought to contain only much younger stars
An unusual meteorite seems to help explain why the planets are in their odd present positions, but plenty of other mysteries remain about our solar system
If aliens took a picture of our solar system from afar, they might find that 6 of the other 7 planets in our solar system sometimes appear exactly the same as Earth in a phenomenon called planet confusion
Black holes born in the big bang could be the dark matter physicists have sought for decades – if they exist. Now there's an audacious plan to find the scars they would have left as they punched through the moon
While most riverbeds on Earth are formed via slow erosion by running water, many of Mars’s deepest canyons appear to have been carved by sudden, catastrophic floods
Previous research suggested Venus may have been habitable for 2 to 3 billion years, but that didn’t take into account the lack of plate tectonics, which affects CO2 levels and narrows the window for life on Venus
Astronomers have spotted hints of a planet that orbits a distant system of three stars – if confirmed, it will be the first time such a world has been found
Plumes of water shot into space by Enceladus, the icy moon of Saturn, may contain molecular signs of alien life, and a spacecraft could collect them from orbit