An exotic new approach could shrink kilometer-scale machines into table-top devices.

Using an observatory under construction deep beneath the Mediterranean Sea near Sicily, scientists have detected a ghostly ...

In this negotiation between Russia and the United States, Ukraine would play no role, not even that of an observer.

Trans-Neptunian objects (TNOs) are icy bodies that vary widely in size, from large dwarf planets like Pluto and Eris—each ...