"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today." ...

Because Pluto is so dim, you need a telescope to see it. “A backyard telescope could do it under the right conditions,” says ...

If it weren't for the new budget, New Horizons could keep exploring the outer reaches of the solar system into the 2030s.

Pluto isn’t considered a planet because it lacks enough gravity to clear its orbit, not just because of its distance. Despite receiving less than 1% of Earth’s sunlight, Pluto is still surprisingly ...

Five planets are retrograde in summer 2025: Pluto, Neptune, Saturn, Mercury and Uranus. Astrologically, that means in for a ...