The status of Pluto not withstanding, our solar system has 8 planets, but one astronomer believes we used to have a ninth ...

Ancient iron meteorites reveal that some of the Solar System’s first solid bodies were built mostly from tiny heat-forged rock beads called chondrules, while water-rich dust was largely excluded. The ...

Iron meteorites show the first bodies of the early solar system were 83% to 92% dry rock, with water arriving millions of ...

Ancient grains inside one of the oldest known meteorites reveal that a surprisingly strong magnetic field existed during the solar system’s first 200,000 years. The discovery suggests magnetism worked ...

Astronomers have discovered a rare in-sync solar system with six planets moving like a grand cosmic orchestra, untouched by outside forces since their birth billions of years ago. The find, announced ...

When the solar system began building its first solid objects, it had two main ingredients available. One was chondrules—tiny, ...

Astronomers have identified radio emissions directly originating from an exoplanet for the first time, revealing a magnetic ...