Gravitational waves are tough to accurately measure in part because they warp detectors and their actor pints on Earth. ESA's Lisa Pathfinder mission will measure movement the precious metal cubes in a 'near-perfect gravitational free-fall' environment.
The supermassive black hole is 40 million times as massive as the sun and powers a quasar that existed 700 million years after the Big Bang.
The asteroid zoomed by Earth at a perfectly safe distance of around 1.8 million miles (2.9 kilometers).
Images show surprise changes to the spacecraft as it interacted with the atmosphere.
