Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

The second half of the 19th century was a particularly interesting time to imagine Mars. This was a period during which the ...

The Hubble Space Telescope time-lapse captured footage of Jupiter, Saturn, Uranus and Neptune. Credit: SCIENCE: NASA, ESA, ...

How Many Planets Are There in the Solar System? There are 8 planets in our solar system. The planets orbit the Sun in ...

The sun is unique in that it's the only star in our solar system. Up to 85% of stars have at least one companion star. The sun contains over 99% of the mass of our entire solar system.

"The extraordinary results are an essential step toward understanding the initial conditions that lead to the formation of ...

As the global population grows, we’ll have to find ways of feeding the planet without accelerating climate change.

Jupiter is the largest planet in the solar system and the fifth planet out from the sun, orbiting the sun at a distance of 5.2 astronomical units (1AU equals the average distance from Earth to sun ...