Arrokoth is a planetesimal in the Kuiper Belt, a vast stretch of space beyond Neptune that holds remnant building blocks of the solar system leftover from our cosmic neighborhood's formation.

The vital ingredients for life on Earth may have been delivered by meteorites from larger bodies called "planetesimals" in the early solar system. The discovery could assist in the search for ...

The 74 planetesimal belts are all found around stars within 500 light years of our solar system. They have a range of ages, ...

Furthermore, in cases where the planetesimal has a head-on collision with the simulated Earth, a large proportion of the resulting moonlet’s mass came from the Earth’s material.

PLUCKY PLANETESIMAL The small, dense remnant of a planet (illustrated) survived the collapse of its sun into a white dwarf, and is now skirting the dead star with a calcium gas stream (yellow ...

Previous research using NASA's planet-hunting Kepler spacecraft found a planetesimal transiting, or crossing in front of, the white dwarf at a distance of about 520,000 miles (837,000 kilometers ...

If Psyche is a planetesimal, it can shed light on the interior of terrestrial planets like Earth. The core of our own world is hidden beneath miles and miles of mantle and crust, making it nearly ...