The two-day countdown test at NASA’s Kennedy Space Center in Florida included filling up the tanks of the giant Space Launch ...

Jupiter, without a doubt, is the biggest planet in our solar system. But it turns out that it is not quite as large — by ever ...

The Moon is far smaller than Earth, yet some of its mountains rise to astonishing heights. Lower gravity and a lack of active plate tectonics allow lunar peaks to grow in ways that aren’t possible on ...

With Area 51 ruled out by President Obama, where might aliens really be hiding? Scientists have now revealed the best candidates.

Since the 1990s, scientists have discovered approximately 6,100 planets outside our solar system, called exoplanets.

Mercury is the smallest planet in our solar system. Explore its size, extreme temperatures, core structure, and comparison with Pluto.

Scientists have discovered something that they previously thought wasn’t possible – an ‘inside out’ star system. When you line all the planets in our solar system up, the four closest to the sun are ...

The Juno observations showed that Jupiter has an equatorial diameter of 88,841 miles (142,976 km), which is about 5 miles (8 ...

HELSINKI — China has published coordinated papers outlining dual missions to the solar system’s edge, suggesting the long-studied project is nearing formal approval. A lead paper on the design and key ...

Far from the Sun’s heat, orbiting the outer planets of the solar system, are moons with oceans of liquid water beneath their frozen surfaces. Keith Cooper finds out how planetary scientists are ...

If all goes according to NASA’s plans, 2026 will finally be the year that astronauts once again launch to the moon. In a matter of months, four astronauts are poised to fly around the moon on a ...

This year, astronomers discovered more than 100 previously unknown moons in our own solar system. There may be many more yet to be discovered, and cataloguing them could help us better understand how ...