The dramatic Marley Foundation Astronomy Discover Center at Lowell Observatory in Flagstaff has a rooftop viewing deck and ...

After a decade-long search, some scientists say a growing number of clues point to the existence of a hidden planet in the Kuiper Belt beyond Neptune — and they may soon have the opportunity to find ...

Since its discovery by telescope in 1930, Pluto has earned its place in astrological lore as the cosmic force of power, ...

Pluto has five moons—“fun-looking space potatoes,” Singer calls them—and its largest is a behemoth. Charon was discovered in 1978 when scientists noticed Pluto appeared to elongate every ...

Today, when tens of thousands of minor planets have been discovered (most residing in an "asteroid belt" between Mars and Pluto), not even the meanest of teachers would require students to learn ...

The solar system has nine planets, but in 2006 the International Astronomical Union declared Pluto a dwarf planet, making the ...

However, the discovery of the first-ever triple black hole system, V404 Cygni, complicates that picture. This black hole is ...

Things have been a mess since Pluto's demotion. In 2006, the International Astronomical Union (IAU) voted on the definition of a planet. Famously, Pluto no longer met the criteria and was demoted ...

Because of that, Pluto is considered an outer planet whose signature through the zodiac signs applies to the ideals and energies of an entire generation. The discovery of Pluto coincided with the ...

November calls us to rise from the ashes and embrace our power with purpose, astrologer Valerie Mesa tells PEOPLE. Here's ...

As Venus in Scorpio lights up your seventh house (commitments, partnerships and negotiations) and Pluto in Capricorn activates your ninth house (education, higher learning and self-discovery), you ...

Astronomers were comfortable with those classifications even when Clyde Tombaugh discovered Pluto in 1930. But that new planet was a stretch — it had a really wonky orbit and was far smaller than the ...