Distance: 12,400 light-years
Why it's weird: Methuselah, a well-known old timer from the Bible, is an apt description for this planet: It's really old. In fact, it's too old. The planet's age is about 13 billion years, almost three times as old as Earth. This means that the planet formed less than a billion years after the Big Bang, a time when astronomers thought planets couldn't form due to lack of materials needed to create a planet's core. It seems the galaxy was an efficient world-maker even in its infancy.