Hundreds of people who love the little planet that was dissed, gather every year in the Arizona town where Pluto was discovered. They celebrate scientific discovery, history and our solar system’s ...

There's a whole slew of objects that astronomers aren't sure whether to classify as "failed stars" or "overgrown planets." ...

It would be understandable if you stopped thinking as much about Pluto after it was “demoted” from being considered one of the nine planets sharing the Earth’s solar system to being classified as a ...

Since Pluto remains in the sun’s orbit, it should be considered a planet due to the fact that it is still a part of the solar system. And since Pluto is still hanging on at the end of the system, it ...

Scientists have identified a rocky outer planet in a system where a gas giant was expected. The discovery challenges ...

Astronomers have uncovered a distant planetary system that flips a long-standing rule of planet formation on its head. Around the small red dwarf star LHS 1903, scientists expected to find rocky ...

According to these calculations, Earth's total lifespan will be about 9.5 billion years.

An international team of astronomers has discovered a distant planetary system that challenges long-standing theories of how planets form. Across our galaxy, astronomers routinely observe a ...

As next-generation telescopes map this outer frontier, astronomers are bracing for discoveries that could reveal hidden planets, strange structures, and clues to the solar system’s chaotic youth.

One of the longest stellar dimming events ever observed was likely caused by the gigantic saucer-like rings of either an unseen brown dwarf or "super-Jupiter" blocking its host star's light, ...

Planetary systems in the Milky Way galaxy tend to follow a particular pattern: rocky planets toward the center, closest to ...