When astronomers announced Kepler-452b, they were not just adding another distant world to a growing catalog. They were ...

Earlier research held that meteorite impacts from the solar system's early days were a major source of Earth's water.

"A strong magnetic field is very important for life on a planet," study lead Miki Nakajima, an associate professor in the ...

New evidence of ancient rivers suggests Mars may have been a "blue planet," thanks to an ocean spanning its entire northern ...

Our planet is unique for its ability to sustain abundant life. From studies of the rock record, scientists believe life had already emerged on Earth at least 3.5 billion years ago and probably much ...

Evidence from fossil shells suggests that falling seawater calcium helped lock away carbon dioxide and helped cool Earth after the dinosaurs.

New research shows ancient tropical oceans once held more oxygen than cooler regions, reshaping where early life could ...

P arts of the ocean reached temperatures of -15°C (5°F) without freezing 717-660 million years ago, geologists and ...