Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. A huge heart-shaped ...

“New Horizons shattered a major paradigm of planetary science,” says Alan Stern, the mission’s principal investigator. “Pluto turns out to have as much complexity as Mars or Earth, so much so that I ...

An annual event over recent years, the I Heart Pluto Festival in Flagstaff, Arizona, celebrates the history, heritage, and cutting-edge astronomy at Lowell Observatory. On Feb. 18, 1930 ...

The controversy endures over Pluto's true status, but the solar system underdog continues to capture hearts across the globe. Clyde Tombaugh didn't set out to discover Pluto when he sent his ...

For the sixth year in a row, Lowell Observatory is hosting the I Heart Pluto Festival, throwing a big party to celebrate its discovery and the 10th anniversary of NASA's New Horizons spacecraft ...