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Once in space, any heat they radiate will obscure the infrared light from distant galaxies, so they must be chilled – but there's a complication.Cooling distorts the mirrors, and to account for this, researchers at the X-ray and Cryogenic Facility at NASA's Marshall Space Flight Center in Huntsville, Alabama, chilled the mirrors down to a mere 25 kelvin (-248 °C) and measured the resulting changes in shape.
Exceptionally high temperatures which have led to wildfires around Moscow can be seen marked in red and brown.
The piece is called Luna Park and was created in the style of American roadside super-sculptures.
It was built in a disused car factory in a village outside Kragujevac in Serbia.
The landslide is just the latest disaster to hit China, which has spent weeks battling the worst flooding in a decade.
(Image: Keystone USA-ZUMA/Rex Features) Think "tiger" and you might think of swampy mangroves or steamy jungles: a pine forest is not the first habitat that comes to mind.(Image: Josep Lago/Stringer/AFP/Getty) On this July morning, 75 tonnes of sharks are being processed in the city of Kesennuma in north-eastern Japan.