Once a realm of imagination and stargazing, the Solar System has now been revealed in stunning clarity through decades of ...

This star, known as HD 110067, may have even more planets. ... This solar system is unique because all six planets move similar to a perfectly synchronized symphony, scientists said.

HD 76920b has an orbital eccentricity of 0.856 (comparable to the eccentric solar system bodies Comet 2P/Encke and asteroid 3200 Phaethon), making it one of the most eccentric planets known to ...

Our Solar System is full of mysteries, but if the inner planets are a puzzle, the boundary between the Solar System and interstellar space is a secondhand puzzle with half the pieces missing.

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, researchers say. ABC News. Video. Live. Shows. Shop. Log In. Stream on.

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – here’s how to spot the celestial show. Close. Advertisement.

Scientists have identified an object about 435 miles (700 km) wide inhabiting the frigid outer reaches of our solar system that might qualify as a dwarf planet, spotting it as it travels on a ...

This phenomenon known as a "planet parade," will feature Mercury, Venus, Mars, Jupiter, Saturn, Uranus and Neptune all present at the same time along a line in the night sky on Friday, NASA says.

For a few evenings around 28 February, every planet in the solar system will be visible in the night sky, thanks to a rare great planetary alignment. Here's how to make sure you don't miss this ...