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How do scientists figure out Earth’s age?

In the early part of the 20th century, scientists still weren't sure how old Earth is. Nowadays, scientists use radiometric dating of various sorts of rock - both earthly and extraterrestrial - to pinpoint Earth's age. >> read more

Interviews of the Week

Featured Content

Forests On The Edge

Hear scientists and other experts speaking about U.S. forests and forest issues>>

NASA Satellite Missions

Hear about how satellites are helping scientists understand Earth's changing environment.>>

Ask The Scientists

EarthSky invited children around the world to ask questions about science.>>

Encouraging Dialogue On The Energy Challenge

Scientists at Shell talk about energy challenges and solutions>>

Nanotechnology In Agriculture

Scientists speak about how nanotech is changing the way we access and produce our food supply>>

Population Challenges to the Year 2050

Earth's population might reach 9 billion by 2050. How humanity handle its crowded future?>>

National Space Biomedical Research Institute

Scientists speak on medical research that's helping astronauts in space - and people on the ground>>

International Polar Year At EarthSky

Hear from scientists who have explored Earth's north and south poles.>>

Chronicles Of A Science Experiment

The stories of science are stories of people. EarthSky follows the science journey of nano research>>

Summit: America's Climate Choices

The National Academies responded to a request from the U.S. Congress in 2009.>>