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Image: Alert, Canada

This Sentinel-1 radar composite image takes us to the northeastern tip of Ellesmere Island (lower-left), where the Nares Strait opens up into the Lincoln Sea in the Canadian Arctic.

dateMar 31, 2017 in Earth Sciences
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Cubic photometer makes light in a room visible

Light determines how we see the world. Take a golf ball: we can see the shine on it, make out the structure or even perceive it as a flat disk because in a certain light we cannot see any shadow. Knowledge of light and how ...

dateMar 29, 2017 in Other
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