Counting Craters: Bad Assumptions Undermine Reliability
January 29, 2019
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
October 30, 2018
A standard method for inferring the ages of planetary surfaces continues to be plagued by bad assumptions.
Time to Revisit the Lunar Dust Problem?
July 18, 2018
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
October 12, 2016
New study of craters shows that moon's surface gets churned every 81,000 years, not every million years.
Pluto Has Active Geology
June 4, 2016
Convection apparently forms the polygonal cells in Sputnik Planum, a large active region on Pluto's surface.
Surprising Youth in the Solar System
January 26, 2016
Four solar system objects in the news look young, not billions of years old.
Pounding Headaches for Solar System Dates
October 19, 2015
It's hard to tell when things crashed into each other.
Where Are the Earth's Impact Craters?
July 13, 2015
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
October 17, 2014
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
March 2, 2014
The brilliant flash lasted 8 seconds on 9/11 – 2013, that is – the brightest impact ever witnessed on the moon.
New Craters Found on Mars
February 13, 2014
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
January 2, 2014
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
May 21, 2013
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?