Scientists determine the age of objects by analyzing growth patterns, radioactive decay, stellar evolution, and cosmic background radiation. Authorities release videos, photos of 'potential subject' ...

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We have only one example of biology forming in the universe – life on Earth. But what if life can form in other ways? How do you look for alien life when you don’t know what alien life might look like ...

During a brief but dramatic chapter in Earth's history about 41,000 years ago, the planet’s magnetic field nearly collapsed. What followed was a cascade of environmental and biological changes that ...

New reconstructions of 540 million years of climate history show the planet tumbling between icehouse and hothouse states, revealing how rare and vulnerable our temperate moment is. Some 4 billion ...