We just arrived at an asteroid: OSIRIS-REx has reached Bennu!
The spacecraft OSIRIS-REx has spent the last 2 years traversing about 2 billion kilometers, to arrive today at the asteroid Bennu.
A subtle misconception about how LIGO works
If a gravitational wave contracts and expands space, shouldn’t the light wavelength be affected in the same way as the interferometer arm distance? If so, how is the wave detected at all?