Trans-Neptunian objects (TNOs) are icy bodies that vary widely in size, from large dwarf planets like Pluto and Eris—each ...

NASA has just made a groundbreaking discovery—a new planet beyond Neptune that wasn’t there before! This mysterious find ...

A new study examines how much material from the closest star system to Earth will end up in orbit around the Sun, and how ...

NASA’s Webb Space Telescope reveals ancient surface of Pluto and other celestial bodies for the first time - Scientists say ...

The four-planet lineup that began in January concludes by mid- to late February, as Saturn sinks increasingly lower in the sky each night after sunset, according to NASA. While Mercury will briefly ...

Neptune and Saturn — all aligned. These events are often called a planetary alignment, but planets always appear in a line in the sky because they orbit the sun — the difference is that they ...

Mercury, the closest planet to the Sun, completes an orbit – a year for the planet – in 88 days. Earth's year, of course, is 365 days, while at the upper end, Neptune takes a whopping 60,190 ...

Take advantage of a special 6-7 planet alignment from Earth's perspective. Planets 'line up' in the skies over California in ...

These are bodies of ice and rock that orbit the sun well past Neptune and Pluto, and they’re large, all more than 1,000 kilometers wide. In fact, with a width of more than 2,300 km, Eris rivals ...

Mars, Venus, Jupiter, Saturn, Uranus and Neptune will be visible all at once this month. ISTOCK / GETTY IMAGES PLUS The planets in our solar system orbit the sun in roughly the same plane ...

Like a celestial parade across the cosmos, five bright planets are lighting up the night sky and visible with the naked eye ...

The four-planet lineup that began in January concludes by mid- to late February, as Saturn sinks increasingly lower in the sky each night after sunset, according to NASA. While Mercury will briefly ...