- A glacial erratic is a glacially deposited rock differing from the type of rock native to the area in which it rests. Erratics, which take their name from the Latin word errare (“to wander”), are carried by glacial ice, often over distances of hundreds of kilometres. Erratics can range in size from pebbles to large boulders such as Big Rock (16,500 tonnes or 18,200 short tons) in Alberta.
- Mirach (stars.astro.illinois.edu)
MIRACH (Beta Andromedae). Andromeda’s three brightest stars, Alpheratz, Mirach, and Almach, lie along a graceful curve that extends to the northeast of the Great Square of Pegasus (Alpheratz part of the Square itself).