The iconic tourist destination provides a beautiful view, but also represents a physical record of Earth's climate history ...

The twinkling stars in the night sky are not just beautiful to look at. Their flickering reveals something about the varying temperatures and densities in the layers of Earth's atmosphere, which ...

The landscape around Troy does not immediately suggest a single ancient city preserved in isolation. The ground rises gradually at Hisarlık, a mound s.

Find the answer for Earth's outermost layer from the people who brought you the USA TODAY Daily Crossword Puzzle.

A gradual dimming and brightening when a star passed behind it suggested the mini-Pluto was wrapped in a thin layer of air.

Africa’s Turkana Rift Zone, a hotbed of hominin fossils, is caught in the act of “necking," a critical transition toward ...

It will likely cost about $1.2 trillion to develop and operate President Trump's planned "Golden Dome" missile defense system ...

Ancient volcanoes in the Arctic may have trapped Earth in repeated "Snowball Earth" freezes for 56 million years.

When atmospheric chemists Paul Crutzen and John Birks added smoke into their computer models of nuclear war scenarios, they ...

The Toba supereruption 74,000 years ago was so massive it may have plunged Earth into years of darkness and cold, leading some scientists to believe humanity nearly went extinct. Yet archaeological ...