The quiet arrival offers another indication that the sun is moving into the declining phase of its 11-year cycle.

In the constellation Cygnus, a bright knot of stars seems to adorn one edge of a nearly perfect 20-light-year-wide circle, ...

Spectroscopy of other stars has led to most discoveries of exocomet systems. In research led by University of Colorado ...

New multi-temperature coronal mass ejection observations might help us better understand how life emerged and evolved on Earth ...