Oumuamua excites space community, even if it's probably just a rock

Three centuries after his death, Sir Isaac Newton still keeps us from travelling to the stars.
Or at least his laws of physics do.
Remember that big space rock called Oumuamua that flew through our neighbourhood in the summer? Astronomers nearly didn’t see it; rocks are dark blobs against a black sky, and a telescope only spotted it as it flew back toward the edge of our solar system and presumably beyond.
For a brief moment in early November, though, some eggheads at Harvard University sa