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“curved”

New device measures curved mirrors' absolute shape to within 2 nanometers without touching them

Researchers at AIST have developed a device that measures the absolute surface profile of curved optical elements with high precision without touching them.

Phys.org - latest science and technology news stories · ٢٩ سبتمبر ٢٠٢٦، ٠٨:٤٠ م

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Is the universe infinite? The answer gets weird fast

Measurements of ancient light from the cosmic microwave background suggest that the universe is remarkably flat. But that does not prove it is infinite, because the observable cosmos could be only a small patch of a much larger curved universe. Space could even be flat while wrap

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