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The universe is filled with countless galaxies, stars and planets. Astronomers may find life one day, but they will need extraordinary proof. ESA/Euclid/Euclid Consortium/NASA, image processing by J.-C. Cuillandre (CEA Paris-Saclay), G. Anselmi

‘Extraordinary claims require extraordinary evidence’ − an astronomer explains how much evidence scientists need to claim discoveries like extraterrestrial life

An astronomer breaks down 3 key components that allow researchers to make groundbreaking discoveries – and decide when results aren’t significant.
Lenticular clouds, like this one over a mountain in Chile, can look like flying saucers. Bilderbuch/Design Pics Editorial/Universal Images Group via Getty Images

How are clouds’ shapes made? A scientist explains the different cloud types and how they help forecast weather

Puffy to wispy, barely there or dark and menacing, clouds come in many shapes and sizes. Each tells a story about what’s going on in the atmosphere.

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