Sen: Probing an Alien Solar System

In 2008, the nearby star HR 8799 earned a place in the history books: It was the first star orbited by multiple planets directly seen in photographs. This was quite an accomplishment; stars are billions of times brighter than planets, so getting actual direct images of the planets is incredibly difficult. And here, orbiting this star, four have been discovered! In the years since, the system has been extensively studied, but it's still difficult. That's why a team of astronomers created LEECH--t...