The ways that they detect planets around other stars is either by tiny fluctuations in movement (gravity from a planet is moving the star a little) or fluctuations in brightness (when a planet passes between the star and us.)
Distant bodies in our solar system take so long to travel in their orbits that we might be trying to figure things out with only 1% of the information. It's fascinating how little of space we've actually looked at.
Keep talking like this and I'm going to think you're flirting with me. ;D