Does our Solar System have 9 planets or only 8? Astronomers have gone back and forth on that a lot, with Pluto now being classified as a dwarf planet. However, out beyond Neptune there could be ...

In August 2006, the International Astronomical Union made the controversial, but correct, decision to demote Pluto from its ...

Why is Pluto no longer a planet? Discover the real reason behind Pluto’s reclassification as a dwarf planet and the science that led to this change.

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Scientists at NASA for the first time have been able to observe the make up of Pluto and other small and icy celestial bodies ...

For the first time, astronomers have imaged dozens of belts around nearby stars where comets and tiny pebbles within them are ...

Each planet in our solar system is given a unique, humorous catchphrase that reflects its personality and role. From ...

These popular astronomy questions, answered by Astronomy magazine, will help you better understand our universe - and share ...

Jan. 7, 2025 — A researcher has used advanced models that indicate that the formation of Pluto and ... could reshape our understanding of the Earth-Moon system and the broader solar system.

However, this year a powerful new telescope is coming online that could prove once and for all that there really is a ninth planet in our Solar System. The same year that Pluto was ignominiously ...

"It's half Pluto's size and 12% of its mass, which makes it much more similar to the Earth's moon than any other moon in the solar system." For comparison, our moon is just a quarter of the size ...