How Astrobiology Could Be Scientific
January 9, 2020
Despite its propensity for wild speculation about life in space, there's one way Astrobiology could provide useful science.
Cut the Habitable Worlds by Half (or More)
June 11, 2019
Astrobiologists figure that most earth-like planets give off toxic gases.
Hope, Not Evidence, Drives Astrobiology
August 25, 2016
Earth-size exoplanets are not evidence for alien life. They are evidence for orbiting bodies.
Extrasolar Planets: Bigger and More Mortal
June 10, 2013
Many of the stars and planets found by the Kepler spacecraft are not earthlike. Also, astronomers have seen planets destroyed by their stars.
Tilt-A-World: Another Constraint on Habitability
January 12, 2012
Did you ever ride a Tilt-A-Whirl, one of those cheap carnival rides that makes you dizzy and sick? Our planet would be like that if its inclination were out of control. Without tilt stability, a new study reveals, we wouldn't be sick, we'd be dead, or never alive in the first place. It's not enough to be in the Habitable Zone. Would-be inhabited planets need to avoid a new problem, called “tilt erosion.”