Lost moon Naiad swims back into view

时间:2019-03-07 05:09:12166网络整理admin

AFTER 24 years, the Hubble Space Telescope has found Neptune’s long-lost ward. The small moon Naiad was discovered closely orbiting Neptune during a fly-by of the Voyager 2 spacecraft in 1989. But no telescope on or around Earth could see it. Mark Showalter at the SETI Institute in California and his colleagues wondered if Naiad was too fast and faint for distant telescopes to spot in a single image. So they overlaid eight Hubble shots from a 2004 search effort – and Naiad showed itself. The results will be presented on 8 October at an astronomy meeting in Colorado. Showalter now plans to focus on Uranus, which has a similarly lost moon called Cordelia. This article appeared in print under the headline “Found: