The planet is almost 25,000 miles around and 4.54 billion years old, and humans are still discovering some of the amazing secrets it's hiding.

How much do you know about our planet? Here are the amazing, odd and downright cool Earth facts scientists learned in the last year.

About 71% of Earth’s surface is covered by water, and 96.5% of that water is found in the oceans.

Earth Day started in the 1970s. Here’s an Earth Day fact everyone should know: Earth Day was first observed on April 22, 1970, followed in 1972 by World Environment Day. It has

Observed annually on April 22, Earth Day aims to raise environmental awareness and inspire global action. It highlights key issues and encourages individuals to support environmental protection

NASA spokesperson Lauren Low told PolitiFact that one of the reasons Earth appears duller is because the new photo was taken at night, with only moonlight lighting the planet. The 1972 photo was taken in direct sunlight. The two images were also processed differently, she said.

These Earth-saving changes actually add up—and help you make a difference without overthinking it

Dive into 100 Facts That Will Amaze You! Explore mind-blowing truths about our planet, space, and the animal kingdom. Uncover incredible secrets and expand

Earth Day began in 1970. Earth Day was first celebrated in 1970, during a time when pollution and environmental damage were largely ignored. Inspired by growing public concern and