Roughly 300,000 years ago, our species first appeared on the African landscape before spreading globally and coming to ...
The continent drifts northeast at about 2.7 inches (7cm) per year - a rate so significant that GPS coordinates must be ...
collided with Earth about 4.5 billions years ago. This is how old Earth was 100 million years ago, a time when the planet was ...
The Earth formed over 4.6 billion years ago out of a mixture of dust and gas around the young ... formation in our solar system may have taken much longer - up to a hundred million years or so. This ...
About 800 million years ago, oxygen levels reached about 21 percent and began to breathe life into more complex organisms. The oxygen-rich ozone layer was also established, shielding the Earth's ...
When Jupiter was young, about 4.5 billion years ago, a protoplanet with 10 times the mass of Earth crashed head-on ... another planet in its first few million years, the scientists concluded.