It's a new policy for the International Astronomical Union.
What exactly constitutes an Earth doppelganger?
Earth looks like a small-fry here
Meet the world's first exoplanet meteorologist.
Looks a bit like home!
It's just like living on Earth, only you weigh 90 pounds more!
Scientists can't know for sure if the worlds have water. But they could, making them a potential habitat for life.
You can call a star, a distant planet or a faraway galaxy anything you want, but it might not hold water with astronomers.
TESS will be the first dedicated all-sky exoplanet hunting satellite.
These findings have changed the way we see our solar system.
A fresh look at planetary data from the Kepler space telescope provides new leads for Earth-like exo-planets.
Tomorrow's historical astronomical event is not just a beautiful novelty
New detection method could help spot signs of life on exoplanets
What are the implications for the search for extraterrestrial life? PopSci asks the experts
Yesterday's smallest-ever exoplanets held that record for just about 24 hours
The smallest exoplanets yet
The exoplanet census is doubled again
What's the most habitable planet?
If you don't need to be in a solar system to have liquid water, then why not take your planet for a spin around the galaxy?
The Kepler telescope team announces a trove
More exoplanet discoveries are pending, as Kepler team approaches deadline to publish data
Survey of scientists compiles astronomical wishlist for the next decade