Astronomy
Why Discovering Martians Could Be Disappointing
There are two kinds of extraterrestrial life with very different implications.
Why Europa Is the Place to Go for Alien Life
NASA is scheduled to probe the Jovian moon in 2023.
The Beckoning of the Ice Worlds
We’ve been looking for life on Earth-like planets. Will Europa teach us better?
The 315-Year-Old Science Experiment
How counting sunspots unites the past and future of science.
Mario Livio on 25 Years of Hubble
The astrophysicist looks at the history of the world’s most famous telescope.