That cosmologists cannot agree on one of the most elementary facts about the universe is striking enough. But that ...

This score means that it’s likely to have been engineered instead of being a naturally occurring force.

A million-light-year bridge of stars links merging galaxies in Abell 3667. This optical evidence confirms a cosmic collision.

A cosmic formation known as the 'dumbbell nebula' will be visible from Earth in August. Will you need a telescope to see it?