fossil group
n.— «All that dark matter makes astronomers think that NGC 1132 grew up through the mergers of many smaller galaxies in an entire group, drawn in by the dark matter. That’s why the galaxy is sometimes called a “fossil group.” However, they can’t rule out a scenario in which NGC 1132 was born as a full-fledged giant—perhaps under conditions that somehow suppressed the formation of lesser galaxies.» —“See A Dark-matter Magnet” by Alan Boyle MSNBC: Cosmic Log Feb. 5, 2008. (source: Double-Tongued Dictionary)
Further reading
Sometimes it’s a challenge to give a book a chance: How many pages should you read before deciding it’s not worth your time? There’s a new formula to help with that decision — and it’s all based on your age. • Have you ever...
Barbara Kingsolver’s book Demon Copperhead is a retelling of Charles Dickens’ David Copperfield set in today’s Appalachia. Martha shares memories of a long-ago visit to Kingsolver’s family farm in Virginia, where they...