Mercury zips around the sun in only 88 days and because ... followed points of light that seemed to move among the stars. The ancient Greeks named them planets, meaning "wanderers." ...
A star's close flyby billions of years ago possibly influenced the solar system's architecture, leading to unusual orbits of trans-Neptunian objects and explaining the origin of Jupiter and Saturn’s ...
Mars’s axis of rotation is tilted 25.2 degrees relative to the plane of the planet’s orbit around the sun, which helps give ... by tracking how seismic waves move through the red planet.