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Earth as a Habitable Planet

When viewed as a planet among planets, Earth is surprisingly surprising, considering how close it is to scientists' investigating eyes.

Of Planets and People

Here's a quick tour of the planets to see what's newsworthy.

Planets Don't Fit Evolutionary Models

Secular planetary scientists are surprised by almost every object they observe in the solar system. Their models cannot reproduce our system of planets.

Mars Radiation Fries Organic Compounds

Don't expect the "building blocks of life" to last very long on Mars.

Impacts: Creators or Destroyers?

Some astronomers invest a lot of creative power in bangs, crashes and explosions.
Triton Neptune montage

Active Moon Triton Revisited

25 years ago today, Voyager 2 flew by Triton, a moon of Neptune, astonishing scientists with its active geology.

Moon Still Has Hot Core

Japanese scientists have determined that a soft, hot core remains in the center of the moon, contrary to expectations.

Fluffballs in Space Shouldn't Exist

A rubble-pile asteroid has such low density it should have disintegrated, but it's doing just fine.

Planet Rotation Limits Habitability

Life can't exist on a planet that rotates too fast or slow. This is another Goldilocks problem for astrobiologists to consider.

New Ways to Find E.T.

SETI researchers may not have to wait by the stellar radio dial for their imaginary friends to call in. They might eavesdrop on their pollution.

Io Volcanoes Go Hyperactive

The volcanoes on Jupiter's moon are bursting out at record rates, and nobody knows why. Is it the new normal?

Rosetta and the Stone

A historic comet rendezvous mission begins today after ten years in space.

Saturn's F-Ring Has Quieted Down

Comparing measurements over 25 years, planetary scientists have noted a drop in bright clumps in Saturn's tenuous F-ring.

Enceladus Geysers Still Unexplained

The number of geysers has topped a hundred on Saturn's overactive moon. How could they be sustained for billions of years?

Reality Check: Favored Planet Theory Dries Up

Three "hot Jupiters" sing "how dry I am," casting serious doubt on the leading theory of planet formation.
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