Twice as large, not 70% larger. There's been two new planet stories in the past day, so it's confusing. First one is of a planet found that's 70% the size of Pluto. That means 30% smaller. Now this one that's twice the size.
This one's an exact copy of Earth, and exact copies of us are on it doing exactly the same things that we are doing. Only it's a mirror image. So when we eventually send an expedition to explore it, they will send one too, with mirror image copies of the astronauts. Both expeditions will land on the mirror planets and everyone will think their own ship went half way out and then came back somehow. The truth will be found out on both planets simultaneously when the same astronaut looks in a mirror and sees the wrong sides of himself being reflected back. The mirrors will then break on both worlds just before the matter-antimatter explosion destroys both planets.