essay

Something unexpected has been happening to a pair of distant space probes. Could strange new physics be the cause?

Life, the universe, and everything, as seen through the eyes of an astrophysicist.

Things space zealots want to be true but simply aren’t. And things they wish were not true, but simply are.

An exposition of all the ways objects can move under the influence of gravity.

A critical review of the occasions when scientists invoke God at the limits off their knowledge.

The meaning and consequences of universal constants that do not change in time or space.

How the frontier of propulsion research can transform the future of space exploration. Part II of “Fueling Up”

The role of propulsion as the key to space travel.

Reviving the debate about whether it is better to send people, robots, or some combination of both into space.

The remarkable implications of the form and structure of the cosmic microwave background radiation.