As Venus and Mercury exit the stage, a few remnants of the "planetary parade" will be visible after sunset. With Saturn already lost in the sun from Earth's point of view as it moves behind the ...

Meet the author: Dr. Phil Plait is an astronomer, author, and science communicator with a PhD in astronomy at the University ...

Turns out, it's as tough to drop inward into the inner solar system, as it is to head outward. The problem stems from losing ...