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The geological clock: a projection of Earth’s 4,5 Ga history on a clock (“MA” = a million years (Megayear) ago; “GA” = a billion years (Gigayear) ago)

Sometimes, discovering when something happened only begins to make sense when it’s seen in relation to other events. This is particularly easy to do if the total time is shown in the form of a clock. The age of the Earth is about 4.5 billion years – on the clock, 1 second equals approximately 52,000 years and one hour is 187.5 million years.

How life may have first emerged on Earth: Foldable proteins in a high-salt environment

Dead Sea coastline. New research has yielded data supporting the idea that 10 amino acids believed to exist on Earth around 4 billion years ago were capable of forming foldable proteins in a high-salt (halophile) environment. Such proteins would have been capable of providing metabolic activity for the first living organisms to emerge on the planet between 3.5 and 3.9 billion years ago.

Chris Hadfield on

Island of Rhodes, Greece - interesting that from space, you can see where the Colossus of Rhodes stood 2300 years ago.

Chris Hadfield on

Mission Patches - a wall of history in the Space Station Node 1, including my last time here, 11 years ago.

Gravity Map of the Moon. The moon and other rocky bodies in the inner solar system were pounded by long-ago impacts far more violently than previously thought. NASA's twin Grail probes have created an ultra-precise gravity map of the moon, revealing that its crust is almost completely pulverized. The surprising find suggests that Earth, Mercury, Venus and Mars endured a similar beating billions of years ago, researchers said.

World's Oldest Fire Has Been Burning for 5,500 Years : Discovery NewsNobody is sure how the coal seam beneath the exterior of Australia’s Burning Mountain, also known as Mount Wingen (“fire” in an aboriginal language), originally ignited. But a coal seam 90 feet below the surface been burning for an estimated 5,500 years, making it the longest continuous fire on the planet.