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Stellar Dust Disks Crumble

Observations show stellar dust disks fragmenting into smaller dust, not growing into planets.

New Craters Found on Mars

Orbiters can count new craters forming on Mars, refining cratering rates. One spectacular new crater has appeared since 2010 with vivid rays.

Imagining Worlds – No Evidence Required

Science fiction is fun, but science demands evidence, not imagination.

Cosmic Lottery: How Many Habitable Planets?

News media ran with a suggestion that one in five stars has a habitable planet, but they didn't read the fine print.

Planet Habitable Zone Cannot Be Too Windy

The "habitable zone" of a planet usually concerns its distance from the star such that it can support liquid water. But what if the star fries the surface with intense stellar winds?
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