Meet Steve – A strange, new 'purple aurora' that lights up night sky
This strange ribbon of purple light named 'Steve' was so first observed by citizen scientists in Canada and eventually verified by the European Space Agency (ESA).
Apr 27, 2017, 10:43 AM ISTZebra stripes not for camouflage protection against predators
Stripes that can be seen by humans are hard for zebra predators to distinguish beyond 50 metres in daylight or 30 metres at twilight, during which most predators hunt, the findings showed.
Jan 23, 2016, 14:41 PM IST