Now European Southern Observatory (ESO) thinks one of the objects floating along the main belt might be the smallest dwarf planet in our solar system — an asteroid known as Hygiea. Hygiea isn ...

Here's what to know about the short life of what was, for a single human lifetime, the solar system's smallest planet ... to ...

Why was Pluto reclassified as a dwarf planet? One might think that it’s purely a matter of size. Mercury, the smallest of the ...

Astronomers have discovered a collection of tiny galaxies located roughly 3 million light-years away that includes the smallest and faintest ... That's because dwarf galaxies this small should ...