Magellan's side-looking radar reached through an enormous skylight beside Nyx Mons, revealing a laterally continuing void best explained as a lava tube. NASA’s Magellan spacecraft did not simply go silent at the end of its mission. Controllers deliberately sent it down. On 12 and 13 October 1994, after a sequence of orbit-lowering manoeuvres, the orbiter entered Venus’s atmosphere as part of a final ... [11236 chars]