Bright skies at night: The riddle of the nocturnal sun
19 December 2017
Before artificial lights blinded our sight, reports of nights as bright as day were common. What lay behind the phenomenon was a mystery – until now
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Stripy ponds in the Utah desert help green the bone-dry land
6 September 2017
Multicoloured patchwork ponds in this desert play a key part in tapping sources of potassium chloride, a vital fertiliser
Asteroid Florence buzzes Earth in closest fly-by since 1890
4 September 2017
A 4.4-kilometre-wide space rock whizzed past Earth on its closest orbit in over a century. This asteroid won’t get this close again until after 2500
