Astronomy
Doubts Grow About the Biosignature Approach to Alien-Hunting
Recent controversies bode ill for the effort to detect life on other planets by analyzing the gases in their atmospheres.
Could Modified Gravity Kill Planet Nine?
A controversial theory can explain phenomena attributed to the mystery planet.
The Thorny Ethics of Making Alien Planets Habitable
Terraforming Mars could risk exterminating the very lifeforms we dream of discovering.
My 3 Greatest Revelations
The author on writing her book, <i>Our Moon</i>, about the power of our satellite to guide evolution and human curiosity.
The Violent Birth of the Moon
Did a colossal collision with a doomed planet give us our satellite?
The Enlightening Beauty of an Einstein Ring
What a trippy gravitational phenomenon can tell us about the universe.











