To point us to a habitable planet, that is.
And that raises its interest to astrobiologists.
The small but significant gap between humans and other animals on Earth may shed light on why we see no alien visitors.
The ultimate animal survivor would still have a hard time on other planets.
And iguanodons may have been smarter than we thought.
Reliable biosignatures need more than a physical resemblance to be convincing.
This bird-like creature raises questions about how smart dinosaurs really were.
Scientists have found that microbes can make chemical bonds that might—conceivably—play a role in alien biology.
No such discovery can be expected within this decade.
If so, could there still be life in the planet’s atmosphere today?
This lizard could teach us about survival on dry planets.
Fault zones could make good habitats, according to recent research.
The debate continues, even as a new transmission is aimed at Polaris.
The comet mission ends with a last hurrah.
A challenge to a new hypothesis, and a great example of how science works.
A new explanation for one of planetary science’s big mysteries.
A new society dedicated to studying life on other worlds.
It depends on water, radiation, and other factors still unknown.
A new genetic analysis points to hydrothermal vents as the planet’s first habitat.
And the three leading theories are...