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What ionized the universe?

The sparsely distributed hot gas that exists in the space between galaxies, the intergalactic medium, is ionized. The question is, how? Astronomers know that once the early universe expanded and cooled enough, hydrogen (its ...

date17 hours ago in Astronomy
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NASA instruments image fireball over Bering Sea

On Dec. 18, 2018, a large "fireball—the term used for exceptionally bright meteors that are visible over a wide area—exploded about 16 miles (26 kilometers) above the Bering Sea. The explosion unleashed an estimated 173 ...

dateMar 22, 2019 in Earth Sciences
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Download the Big Bang on your smartphone

Experience the 13.8-billion-year-old story of the universe in just seven minutes with CERN's new Big Bang app. Launched today at the Google Arts and Culture event in Washington D.C., the app, free and available for download, ...

dateMar 06, 2019 in General Physics
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