Solar System

One of the most studied space rocks of all time has surprised us again, with the "mudball meteorite" Aguas Zarcas having cruised around the solar system for two million years without as much as a scratch. It defies the "fragile" class it belongs to.

Asteroid Bennu seems to have come from a long-lost world on the fringes of the solar system, where saltwater pooled and dried over thousands of years and life’s basic ingredients were widespread.

Our solar system might still bear the scars from an extremely close shave with an alien star. Such an encounter – the closest pass we know of – would have shaken up objects on the outskirts and might even mean there’s no Planet Nine after all.

The official definition of a “planet” could be set to change again soon. Last time that happened, Pluto was kicked out of the club, but the new proposed definition is designed to be more inclusive.

Researchers have just revealed that Mimas, one of Saturn's smallest moons, has an ocean of liquid water flowing under its entire surface. What is really making waves though, is how young the body of water is: just 5 to 15 million years old.

The solar wind is constant in the solar system – except on Christmas Day 2022 when it suddenly vanished completely. The event was detected by a NASA spacecraft orbiting Mars, which found that the Red Planet’s magnetosphere tripled in size in response.

Our solar system officially houses eight planets, but some scientists say there could be a ninth hiding on the fringes. Now, a new study has found the oddities could be explained by modified theories of gravity, an alternative idea to dark matter.

Our Sun is capable of terrifying outbursts – and now scientists have discovered evidence of its biggest tantrum on record. Tree rings dating back 14,000 years contain a radiocarbon spike twice as powerful as the previous biggest known solar storm.

Solar wind – charged particles from the Sun – pervades our solar system, but the exact mechanism behind it remains murky. Now ESA’s Solar Orbiter spacecraft has observed previously unknown tiny flares on the Sun’s surface spewing plasma into space.

Radioactive isotopes found in meteorites suggest a supernova went off right near the Sun as it was forming – but that should have blasted the young solar system away. So how did we survive? A new study proposes an explanation.

The James Webb Space Telescope has detected water vapor on an object in the asteroid belt, a region of the solar system where it wasn’t known to survive. The new observations also reveal something unexpectedly missing.

Astronomers have classified planetary systems into four distinct categories, based on the sizes and arrangements of their planets. As it turns out, the architecture of our own solar system is the rarest kind.