Henk Hoekstra is a professor in observational cosmology at Leiden University.

Very often, the strongly coupled electron and nuclear dynamics induce radiation-less relaxation processes known ... state ...

Veterans who helped test nuclear weapons are fighting to renew a 34-year-old law meant to help compensate for the long-term ...

Stunning close-up views of the Sun reveal its dynamic magnetic structures and extreme temperatures, captured by ESA's Solar ...

Recent research has raised the tantalizing prospect that our Solar System, in which we thought we were alone, may be dotted ...

Not Horsing Around! In North Carolina, a miniature horse named Sweetie has set a Guinness World Record by having a nearly six ...

A small eruption of cooler material rising and then collapsing into the surface was filmed by the European Space Agency.