Have you ever wondered what our solar system looked like 3.8 billion years ago? Were the planets we know today anything like ...

Now, there’s no scientific reason we can’t have thousands of planets in the solar system, but cultural considerations are a different issue.

A newly discovered ice comet from deep space may be over 7 billion years old, making it the most ancient comet scientists ...

Carbon dioxide has been detected on a planet outside our solar system for the first time. The gas has been observed directly by the James Webb Space Telescope on four exoplanets, all belonging to ...

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 ...

Our Solar System’s moons and planets have water—in the form of ice, vapor, and even oceans. Scientists are finding more evidence of water outside of Earth.

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 ...

Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why Pluto isn't a planet.

Astute skywatchers may have already seen the striking line of planets across the night sky in January. This week Mercury joins the queue. Now every other world in our solar system will be visible ...

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 ...

Jupiter’s Great Red Spot, the solar system’s largest storm, wiggles like gelatin and contracts like a stress ball, new observations from Hubble Space Telescope find.