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These images were taken of comet C/2013 A1 Siding Spring by NASA's Mars Reconnaissance Orbiter on Oct. 19, 2014, during the comet's close flyby of Mars and the spacecraft.
A four-image NAVCAM montage comprises images taken on 18 October from a distance of 9.8 km from the centre of comet 67P/C-G - about 7.8 km from the surface.
The global picture of how Earth reflects sunlight is a muddle, though several regional trends emerge.
Apple Pay will allow iPhones to act like credit cards, easing the way to a wallet-less future. What can Apple learn from past payment plans?
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