What the Apollo Rock Samples Revealed About the Moon
July 19, 2019
The lunar rocks changed what scientists thought they knew about our satellite, but raised many more questions.
Spinning Solar System Objects to Keep Them Old
June 7, 2019
If you remove the obligation to think in billions of years, many phenomena in the solar system make more sense.
Surprising Water Found on Inner Solar System Objects
December 13, 2018
Recently-visited objects in the inner solar system show evidence of water ice or volatile materials.
Ceres Looks Seriously Young
September 20, 2018
Asteroids should not be so active. This one was, and is.
Did Earth Get Its Water from Meteor Squirt Guns?
April 28, 2018
You can't just fire bullets at pumice and claim that Earth got its oceans that way.
Dawn of a Young Ceres
September 10, 2016
The largest asteroid has a problem: she's too young to get a date.
For the Love of Trees
July 23, 2016
You don't have to be a proverbial tree-hugger to love trees and wonder at all the things they can do, and do for us.
Beware of Misinterpreting Water Claims
June 16, 2014
A claim of vast reservoirs of water deep in the earth is based on indirect evidence, and likely has little or nothing to do with surface water or floods.
Invisible Influence of Plants Coming to Light
August 13, 2013
The air is filled with substances we barely notice – molecules produced by plants – but they have profound effects on climate and ecology.