A rock from another solar system is a direct probe of how planetesimal formation took place at another star,” explained Michele Bannister, a planetary scientist at the Rubin Observatory. The recent ...

The solar system has a new alpha planet: Astronomers confirm 62 new moons for Saturn. ... Retrograde orbit: The moon orbits the planet in the opposite direction of the planet's rotation.

When the planets formed, smaller objects, named planetesimals, were flung away from the sun due to gravitational interactions and ended up settling on the very edge of the solar system.