Saturn, Venus, Neptune, Uranus, Jupiter, Mars and Mercury will be visible in an uncommon planetary alignment this month.

“New Horizons shattered a major paradigm of planetary science,” says Alan Stern, the mission’s principal investigator. “Pluto ...

Six planets are visible in the night sky right now. On Feb. 28, Mercury will add a seventh planet to the planetary parade. Venus, Mars and Jupiter are 'great naked-eye targets' for beginning ...

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

Today is about reflecting on your career, staying emotionally engaged, and preparing for upcoming changes in your ...

Clyde Tombaugh didn't set out to discover Pluto when he sent his sketches of the night sky to Lowell Observatory in Flagstaff ...

An amateur astronomer discovered Pluto 95 years ago today. The former planet will complete an orbit in another 153 years.

“NINTH PLANET DISCOVERED ON EDGE OF SOLAR SYSTEM ... its planetary status and you would have to confer the same honor on Eris, a Kuiper Belt object of about the same size, as well as any ...

Unlike other planets that have a more or less circular ... planetary status and you would have to confer the same honor on Eris, a Kuiper Belt object of about the same size, as well as any ...

Edinburgh Science Festival is the first and still one of Europe’s biggest science festivals, taking place over the Easter ...