Landslides on Pluto Happened Quickly

If Pluto is really 4.6 billion years old, something happened almost instantaneously out there some time ago. In planetary science, where experts are accustomed to thinking everything is billions of years old, sudden unique events present problems. Almost everything should have settled down by now into a routine. One can certainly argue for exceptions, where […]
Delicate Arch, Utah

Sandstone Arches Get New Explanation

The national park signs may need updating.
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