Illustration of the shift in perspective that happens as an observer moves between the 2 positions, in this case, with respect to a tree and distant mountains. From each position, the observer sees ...
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Science word of the day: Parsec
What it means: Ah, the humble parsec, thorn in the side of George Lucas. In 1977, Lucas' "Star Wars: Episode IV ‪—‬ A New Hope" script had Han Solo bragging that the Millennium Falcon completed the ...
[EN VIDÉO] Le Système solaire s’étend sur quelque 10 milliards de kilomètres. Au-delà, les distances astronomiques sont quantifiées en années-lumière. Unisciel et l’université de Lille 1 nous ...
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