We live in an age of astronomical marvels. Last year Europe’s Rosetta spacecraft made a daring rendezvous with the comet Churyumov-Gerasimenko, revealing a bizarre double-lobed mountain of ice and rock with landscapes of vertiginous crags and ashen scree slopes. In our image-saturated age it’s easy to forget that such views are only possible through the intermediary of sophisticated technology: cameras and computers and the spacecraft that carry them halfway across the solar system.