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What the Apollo Rock Samples Revealed About the Moon

The lunar rocks changed what scientists thought they knew about our satellite, but raised many more questions.

Counting Craters: Bad Assumptions Undermine Reliability

A new chronology of Earth/moon history reaches conclusions that are so assumption-ridden as to be worthless.

Crater Count Dating: Self-Secondaries Reduce Age Estimates

A standard method for inferring the ages of planetary surfaces continues to be plagued by bad assumptions.

Time to Revisit the Lunar Dust Problem?

How deep should lunar dust get over billions of years? Opinions have vacillated between extremes, but a new study might open up the debate again.

Moon Just Got 100-fold Younger

New study of craters shows that moon's surface gets churned every 81,000 years, not every million years.

Pluto Has Active Geology

Convection apparently forms the polygonal cells in Sputnik Planum, a large active region on Pluto's surface.

Titan Takes the Age Stage

Saturn's giant moon has prompted a flurry of new science papers. Can anyone keep it billions of years old?

First Pluto Papers Published

Planetary scientists have published their first official findings about the 9th planet (or dwarf planet), Pluto.

Surprising Youth in the Solar System

Four solar system objects in the news look young, not billions of years old.

Pounding Headaches for Solar System Dates

It's hard to tell when things crashed into each other.

Is Pluto Another Geyser World? "Shocking" Images Baffle Scientists

In addition to featureless plains, Pluto may even sport active geysers—with no recourse to tidal heating to power them.

Where Are the Earth's Impact Craters?

The number of impact craters on Earth is almost negligible compared to Mars and the moon. Can erosion explain this?

Mercury, Moon May Still Be Erupting

Two objects that should be old and dead show surprising activity. Other indications of youthfulness in the solar system are noted.

Record Impact on Moon Ups Cratering Rate Estimates

The brilliant flash lasted 8 seconds on 9/11 – 2013, that is – the brightest impact ever witnessed on the moon.

Fresh Impacts Viewed on Mars, Moon

New impacts observed on the moon and Mars allow space scientists to learn about crater formation in near real time. What conclusions can be drawn?
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