The moon's thin atmosphere, called an exosphere, has been a puzzle to science for some time. Two main processes were thought ...

From four-dimensional hexagons to the mind-bending amplituhedron, geometrical shapes are wilder than we learn at school - and they are a crucial tool for understanding reality ...

The campaign’s first flight was also the first mission for NASA Armstrong’s Alta-X quad rotor, remotely piloted drone. The Alta-X flew to predetermined altitudes and hovered while mounted sensors ...

Three-dimensional time is a theory in which time, like space, has multiple independent directions—typically imagined as three axes of time motion, similar in concept to the spatial X, Y and Z axes.