When the International Astronomical Union announced in 2006 that Pluto was being demoted from its status as the Sun’s ninth ...

"My colleagues and I were over the moon when we were invited to participate in an international mission funded by Nasa." ...

I’m implicated as an accessory to the demotion of Pluto,” the astrophysicist tells PEOPLE, explaining why they are upset ...

Astronomers have uncovered evidence of a potential second Kuiper Belt, expanding the boundaries of our solar system. Here's ...

R esearchers looking for objects in the Kuiper Belt – the donut-shaped region beyond the orbit of Neptune containing icy ...

Mexico, N.Y. – Malaki Sandejas, 8, loves a dwarf planet. Sitting next to his mom on their couch, he rattles off the five in our solar system. “The dwarf planets are Haumea, Makemake, Eris, Ceres and ...

Only NASA's New Horizons spacecraft—one of five spacecraft that have reached the outer solar system—has managed to fly ...

According to the experts, the mysterious objects could be essential for a better understanding of the formation of the solar ...

Starting Saturday, more than 200 new laws will take effect in Arizona. Here’s a breakdown of seven laws about topics from ...