In mythology, it was Eris that sparked the quarrel ultimately resulting in the Trojan War. It was fitting then that Michael Brown of the California Institute of Technology should name this highly debated object Eris. Learn more about...

In mythology, it was Eris that sparked the quarrel ultimately resulting in the Trojan War. It was fitting then that Michael Brown of the California Institute of Technology should name this highly debated object Eris. Learn more about...

Reinforce your knowledge about the solar system. Find out what does it take to be a planet, large empty spaces and the dwarf planet.

This regularly updated site chronicles research, key facts, and the reasons for downgrading Pluto from a planet to dwarf planet. Recent discoveries from the New Horizon spacecraft and months of archived articles are kept here as well.

This regularly updated site chronicles research, key facts, and the reasons for downgrading Pluto from a planet to dwarf planet. Recent discoveries from the New Horizon spacecraft and months of archived articles are kept here as well.

An illustration showing Pluto's and the other planet's orbits around the sun.

Want to lose weight in a hurry? Just step on a scale on almost any other planet! This page allows you to enter your weight on Earth and it will calculate your weight on all of the other planets, some moons and even some stars. Requires a...

A diagram of the solar system.