Solar System How do scientists predict the orbit and apparent “peak” magnitude of an incoming comet such as Comet ISON (C/2012 S1) when it is far from Earth?
Solar System What effect, if any, do the objects in the Kuiper Belt and Oort Cloud have on the orbits or characteristics of the eight major planets?
Deep-Sky Objects, Exotic Objects, Stars How can scientists distinguish between planetary nebulae and supernova remnants?
Exoplanets, Human Spaceflight, Planets, Robotic Spaceflight, Solar System, Space Exploration The Week in Pictures: August 17–23, 2013
