stronomy and cosmology can feel detached from everyday reality. But what if we could take a 23rd-century starship tour through the Milky Way and experience the cosmos like an Earth-bound tourist visiting exotic destinations? What would we see from our window?
Parts of the image are straightforward: it shows two naked humans, with the probe to the same scale, and a solar system map. But what do you make of three small vertical lines over one horizontal line to the right of the female figure? Or a starburst effect filling half the plaque?that it was hoped could be understood by aliens. The collection of lines give the woman’s height, thanks to information deduced from the pair of linked circles at the top of the plaque.
The central star has so much gravitational attraction that it remains spherical, but matter further out from the centre flattens into a rotating disc, just as a ball of pizza dough does as it is spun. In both cases, there is attraction towards the centre, but not at 90 degrees to the direction of rotation, producing the flattening. Material in the disc eventually coalesces because of gravity, producing planets.
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