Gravitational waves reveal “mystery object” merging with a neutron star The so-called "mass gap" might be less empty than physicists previously thought.

Looking at the clustering of objects, astrophysicists have suggested that they are being "shepherded" by the gravitational influence of a large unknown planet far beyond the orbit of Neptune.

Could data pointing toward a mysterious planet at the edge of the solar system actually suggest it's time to revisit our theory of gravity?

A plush toy designed in south-west Wales could be sent to space to help astronauts establish the presence of gravity on the Moon's surface. Courtney John, 27, from Llanelli, is a finalist in a Nasa ...