For years, scientists have puzzled over why Earth and Mars are missing certain key elements. Now, a fresh study suggests ...

Psyche is a 140-mile-wide (226-kilometer) asteroid which may be the stripped-down core of a shattered planetesimal, one of the building blocks that come together to form a planet.

"The Solar Family" is an 11-minute educational film produced by Encyclopedia Britannica Films in 1936. It presents the evolution of the solar system through the lens of the planetesimal hypothesis ...

In this case, the planetesimal that was the beginning stage of Earth didn’t drop its MVEs at the start of its development. Instead, the loss of its MVEs occurred over a prolonged period of time, ...

image: Planetesimal collisions during planet formation in the early solar system. view more Credit: Kouji Kanba Understanding where Earth’s essential elements came from—and why some are ...

The so-called 'planetesimal belts' are filled with tiny millimeter-sized particles created by collisions between comets. Rings of comets have been discovered around 74 alien star systems ...

Main: An illustration shows an asteroid streaking toward the molten primordial Earth with the sun in the background. Inset: An iron meteorite from the core of a melted planetesimal (left) and a ...

An iron meteorite from the core of a melted planetesimal (left) and a chondrite meteorite, derived from a ‘primitive’, unmelted planetesimal (right). Credit: Rayssa Martins/Ross Findlay ...

Anyone who’s watched the 2021 black comedy ‘Don’t Look Up’ will recall the plans, proposed by Mark Rylance’s odious ...

Could Psyche be the core of the planetesimal body that struck Earth and resulted in the formation of the Moon? Colton Brooks Virginia Beach, Virginia Psyche appears to be an iron core, or part of ...

About 16 to 20 astronomical units (AU) from the star — roughly the distance that Uranus orbits the Sun — an icy giant planetesimal crashed with another hefty object.