You may have heard of Lagrangian points — they are five gravitationally stable locations around our planet, created by the forces exerted by the Earth and Moon on each other. They're a perfect place to put a satellite (and indeed we have). In this incredible model, you can see exactly where they are, and why.
A newly-discovered asteroid near Neptune holds several clues about the early formation of our solar system.
You've heard of space explorers exploiting gravity to save fuel, but using a new method, spacecrafts could, with a little push, roll through the solar system mostly unaided. It's like rolling downhill all the way to work to save gas.