Astronomers have, for the first time, pinned down both the mass and distance of a planet that drifts through the galaxy ...

Test rack: a GRACE-FO spacecraft being tested in Germany prior to launch. (Courtesy: Airbus DS GmbH/A Ruttloff) A laser ranging interferometer (LRI) has been used to measure changes as small as 200 pm ...

The cosmic distance ladder employs a series of methods to measure increasingly vast astronomical distances, with each technique building upon the previous one for verification. Parallax, using stellar ...

Taking advantage of the very high spatial resolution provided by the Very Large Telescope Interferometer, a team of French and Swiss astronomers [1] has measured directly the change in angular ...