we can see the gravitational footprints of dark matter

Categories: Comparisons

An example of simile used in popular science discourse:

"So, we didn't see Neptune itself, we noticed Uranus behaving strangely and that clued us in that there was this mysterious planet pulling Uranus around. And we discovered dark matter in a similar way. When we look at how galaxies move around the universe, whether it's sort of galaxies orbiting inside clusters, or even individual galaxies spinning round, everything is moving as if there is a lot of invisible stuff around, like we're seeing the gravitational footprints, if you like, of this weird invisible stuff, and we just can't see it at any wavelength."

Dr Matthew Bothwell (Public Astronomer at the Institute of Astronomy, University of Cambridge) was speaking on an episode ('Invisibility Quest') of the programme*/podcast* 'Curious Cases'

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Author: Keith

Former school and college science teacher, teacher educator, research supervisor, and research methods lecturer. Emeritus Professor of Science Education at the University of Cambridge.