Astronomers didn't expect so many quasars to have halos. The discovery may help them probe the large-scale structure of the universe, aka the cosmic web.
It's not the first meteorite found by a rover on Mars, and won't be the last. In fact, in several ways, Mars is a meteorite-hunter's paradise. Photos here.
Remember when they said it would take more than a year for New Horizons to send its data back from Pluto? Now, say scientists, "We have our pot of gold."