Pluto was once known as the ninth planet but was reclassified after scientists set clear criteria for planets. The key factor was Pluto’s inability to clear its orbital path, leading to its current ...

Pluto reaches opposition at 3 A.M. EDT. Opposition is when objects typically appear at their best, and with no Moon in the ...

A newly discovered dwarf planet called 'Ammonite' (2023 KQ14) has been spotted in the outer solar system, and it could be ...