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#astronomy

107 posts83 participants12 posts today

It's the time of the year in which I challenge my students of #physics in engineering in producing a "tomato battery", i.e. to reproduce on stage the basic functioning principle of a galvanic cell: a pair of suitable metals, an acid solution, and some connecting wires.

"one tomato" battery is not enough to generate the 1.5V tension needed for the small digital clock, so they have to realise a serie of two tomato batteries is needed.

#UMPlus - Einstein Ring in Hydrus

universomagico.net/2025/04/ani

The James Webb Space Telescope has captured a rare cosmic phenomenon called the Einstein Ring. What at first appears to be a single, oddly shaped galaxy is actually two galaxies separated by a great distance. The closer foreground galaxy is at the center of the image, while the more distant background.....
#astronomy #space #astrophysics #astrophotography