It’s one of the most remarkable achievements of science of all: that we can go back billions of years in time and understand when and how our Universe, as we know it, came to be this way.
Two ways to measure the age of the universe give different answers. The discrepancy is large enough that some cosmologists — scientists studying the history and makeup of the universe as a whole — are suggesting the field is in crisis.
The star in the constellation of Orion has been visibly dimming since late 2019, and now stands at just 36% of its normal brightness. Astronomers are talking about the chance of the star becoming a supernova.
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Nine runners-up plus the top science achievement of the year
At the center of a distant galaxy there's a black hole with the mass of several billion suns. And now, for the first time, we can see it.
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The history of our Universe is written in the skies. Examining ancient signals from the dawn of time, radio astronomers can reconstruct the evolution of the Universe.
A million people have signed up to "raid" Area 51, mostly as a goof. But to seriously look for extraterrestrials, where do you look? And how?
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