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#NYTScience #KiloGram

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The Kilogram is Dead. Long Live the Kilogram!😅

After a vote (and a century of research), the standard measure for mass is redefined, and the long reign of Le Grand K is ended.

Since 1889, Le Grand K, a sleek cylinder of platinum-iridium metal, has ruled from its underground vault in Paris. An absolute monarch, it was the very definition of one kilogram of mass. Scientists from around the world made pilgrimages to it, bringing along their national kilogram standards to weigh in comparison.

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#NYTScience #Photons #Universe #Vision

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All the Light There is to See? 4 x 10⁸⁴ Photons.

The star cluster known as NGC 1866, on the edge of the Large Magellanic Cloud. The observable universe contains at least two trillion galaxies and a trillion trillion (yes, you read it correctly!) stars.

Astronomers have calculated all the light ever produced by all the stars in the cosmos. It’s a lot, but on the cosmic whole, not that much.

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