... Tonight's Sky . ... Observing . ... ALMA discovers comet factory . The dust trap found around a young star solves the mystery about how dust particles can grow in size. ... But in the near future, ALMA will be able to observe dust traps closer to their parent stars, where the same mechanisms are at work. ... Only registered members of Astronomy.com are allowed to comment on this article. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...