As all readers of Science News know, scientific knowledge advances relentlessly. Whether it is news of a potential new drug for Crohn’s disease, an aurora detected on Mars or a science fiction–like 3-D printer that makes objects from a pool of goo, each issue is chock-full of the latest exciting developments. But sometimes it’s useful to look back and take stock of where we are and how we got here. In this issue, both feature articles focus on anniversaries, though of two very different kinds.
The story of the Hubble Space