Scientists determine the origin of extra-solar object 'Oumuamua - it is likely a piece of a Pluto-like planet from another solar system. Until now, we've had no way to know if other solar systems have Pluto-like planets, but now we have seen a chunk of one pass by Earth.
Mars dust storms may cause mysterious 'zodiacal light' in Earth's night sky
Jupiter's 'dawn storm' auroras are surprisingly Earth-like