Earth, between sweltering Venus and frozen Mars, formed and orbits within a band where water could persist in solid, liquid, and gaseous phases. Mars had surface water, but not as much as Earth, and ...

Over the quarter century I’ve been writing this column, I’ve been flabbergasted by the advances in telescopes for backyard ...

Humanity's exploration of outer space continues to unveil astonishing discoveries that challenge our understanding of the ...

For a century, exoplanet hunters have “discovered” planets around a nearby star, only to retract the claims. But the latest ...