Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary status.

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Looking up at the moon in the night sky, it’s difficult to grasp just how dramatic the topography of its surface really is.

New U.S. Interior Secretary Doug Burgum has issued a 15-day review of all public lands and national monuments that, until now ...

Hauling in enough rock to pile behind a retaining wall that high and that long will be a massive operation. But the closer ...