background

What is the cosmic microwave background?

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The cosmic microwave background (CMB) is leftover radiation from the Big Bang or the time when the universe began. As the theory goes, when the universe was born it underwent rapid inflation, expansion and cooling. (The universe is still expanding today, and the expansion rate appears different depending on where you look). The CMB represents … Read more

Scientists Have Detected a Faint Hint of The Background Hum of The Universe

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Ever since scientists made the first detection of gravitational waves from a pair of colliding black holes in 2015, evidence has been growing that the Universe ought to be full of them.   Every massive event – every black hole or neutron star merger, every supernova – should have sent gravitational waves ringing out across … Read more