The Juno satellite, which left Earth five years ago, had to fire a rocket engine to slow its approach to the planet and get caught by its gravity.

Mars used to have far more oxygen than it does now, scientists have said, potentially making it far more Earth-like (and possibly habitable) than previously believed.

Astronomers have discovered the largest planet outside our solar system orbiting two stars, at a distance that would make it potentially habitable for people, scientists announced Monday.

An analysis of radar images that peered inside the polar ice caps of Mars shows that Earth's neighbor is coming out of an ice age that is part of an ongoing cycle of climate change, scientists said

Scientists have found evidence for widespread buried deposits of iron- and calcium-rich carbonates on Mars, which suggests that the red planet once hosted habitable environments with liquid water.

The most detailed map of Mars' gravity has been released, using the planet's gravity to indicate contours and curves on the surface.

The solar system may host a ninth planet that is about 10 times bigger than Earth and orbiting far beyond Neptune, according to research published on Wednesday.

A team of astronomers have found a mysterious dwarf planet, which is believed to be three times further from the Sun than Pluto.