Those little wiggles would be the signature of Earth-like worlds lying at a not-too-hot, not-too-cold distance from their suns. And it’s on those planets that you just might find Earth-like life ...

The planet Kepler-452b is possibly rocky, though we don't know that for sure yet. Kepler-452b is one of more than 500 new exoplanets announced today, found in the data from the orbiting Kepler ...

Any alien civilizations born on "super-Earth" alien planets may be ground-bound by their home worlds' powerful gravity, a new study suggests.

This planet, part of an event called OGLE-2016-BLG-0007, had a mass ratio about twice that of Earth’s. That makes it a rare find—and an important one. Related Stories ...

Rocks much smaller than ours lack the gravity to hold an atmosphere, ... 4. Earth-like planets Headlines oft herald worlds as “Earth-like,” and a couple dozen could be.

(I used the model of Sotin et al. in Sotin, C., Grasset, O., Mocquet, A. 2007. Mass-radius curve for extrasolar Earth-like planets and ocean planets. Icarus191, 337-351.) How large is the core of Wet?

"A planet like Jupiter might even swallow Earth. Or Earth might come out the other way if it is a grazing encounter, but probably without its atmosphere," he said.

Planets like Earth shouldn't get too close to their bigger, bullying neighbors. Jupiter-size worlds can wreck life-friendly conditions on their smaller neighbors. Skip to main content ...

Scientists have discovered a possibly habitable planet circling the star Proxima Centauri just over 4 light-years from Earth.

Earth, Mars and Venus all looked pretty similar when they first formed. Today, Mars is dry, cold, and dusty; Venus has a hot, crushing atmosphere. Why did these sibling planets turn out so different?

These are just planet candidates that have yet to be confirmed like Kepler-452, which is the first confirmed planet spotted that hits the triumvirate of being the right size in the right place ...