An artificial eclipse for imaging extrasolar planets

As anyone anticipating this month’s eclipse knows, one way to dim a star is to block it with something else – a moon, perhaps. Or in the case of distant stars whose light masks orbiting exoplanets, a shade-throwing satellite might do.

Black holes appear to be orbiting each other

After 12 years observing black holes at the center of an amalgam of ancient galaxies, a multi-institution team, including Stanford’s Roger Romani, may have recorded the smallest-ever movement of an object across the sky.