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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.

Venus: 80% of Its History Is Missing

In spite of being called Earth's twin, Venus is vastly different. Scientists are struggling to fit its young surface to 4.5 billion years.

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?

Titan and Mercury: Challenges to Billions of Years

News from Titan and Mercury continue to challenge current theories that they formed billions of years ago.

Crater Count Dating Still Unreliable

Worries about the crater count dating method, widely relied upon to infer ages of planetary surfaces, began emerging in 2005. Those worries have not subsided; they have only grown worse. Crater numbers may have nothing to do with age.
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