Pluto reaches opposition and is ready for those who want to chase it down. Use the biggest scope you've got, or take aim with ...

How many dwarf planets are there in our solar system? The recent discovery of 2017 OF201 makes the tally anywhere between five and 18, plus hundreds of potentially undiscovered ones, depending on ...

Sky This Week is brought to you in part by Celestron. Friday, July 4Mercury reaches its greatest eastern elongation (26°) from the Sun at 1 A.M. EDT this morning. You can view the tiny planet in the ...

Sedna will reach its closest approach to the Sun in 2076, providing a remarkable space-faring opportunity that won’t come ...

When it was discovered, Sedna was around 8 billion miles (13 billion kilometers) from the Sun. (Pluto, the most famous dwarf planet, has an average distance of 3.7 billion miles from the Sun ...

“We’re in a new era in two ways,” Pluto explained. “At least in the Eastern Conference, it is the era of the Achilles injury and the era of the second apron.” ...

The James Webb Space Telescope (JWST), operated by NASA, has uncovered intriguing new details about Charon—Pluto’s largest moon—including the presence of previously undetected surface chemicals. This ...

Despite being covered in impact craters that could potentially send pieces of the planet into space, we have never found a piece of Mercury. Until, just maybe, now.

This month offers a parade of star clusters, meteors, and various planet sightings, including the difficult-to-spot dwarf planet Pluto. Here’s what to look for in the July night sky.

But as Pluto noted, today’s game is different – the average major league hitter is batting just .242, and teams are constantly facing relievers throwing 95-plus mph.

This new dwarf planet may exist at the edge of the solar system, possibly disproving Planet Nine's existence. This is the story of that newly encountered planet.

Simultaneously cooling Pluto while energizing atmospheric molecules to allow them to escape into space, Pluto's haze plays a key role in the planet's energy balance.