An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

This finding explains the discrepancy between the number of basins detected on the Moon (~40) and the number predicted (~300) by an accretion scenario of planet formation.

This understanding was used as a metaphor for what happens within our inner worlds when a planet ... 2024-February 4, 2025 When planets are in retrograde, the world around us continues to move ...

Most of the dense material in the dust cloud is attracted strongly and ends up here. The inner four planets (Mercury, Venus, Earth, and Mars) are rocky and have solid surfaces that can be walked on.

To tackle this puzzle, Malhotra and colleagues considered a less-examined scenario: that a visiting star-size object tweaked these planets' paths around 4 billion years ago. Related: Giant 'kidney ...