Upon rediscovering this object in 1612, Simon Marius said that it glowed like a candle seen through   a horn. Its first discoverer, who described it as a small cloud, was Abd al- Rahman al-Sufi. This  can be located using Alpheratz and Mirach, two stars in the constellation that shares this object's   name. The discovery of Cepheid [SEF-ee-id] variables inside this object by Edwin Hubble settled  the Shapley-Curtis Deba
Upon rediscovering this object in 1612, Simon Marius said that it glowed like a candle seen through   a horn. Its first discoverer, who described it as a small cloud, was Abd al- Rahman al-Sufi. This  can be located using Alpheratz and Mirach, two stars in the constellation that shares this object's   name. The discovery of Cepheid [SEF-ee-id] variables inside this object by Edwin Hubble settled  the Shapley-Curtis Debate, proving that this object is not a nebula and establishing the existence of  galaxies outside the Milky Way. Also known as Messier [mess-yay] 31, this is the largest galaxy in  the Local Group. Name this spiral galaxy expected to eventually collide with the Milky Way.
Upon rediscovering this object in 1612, Simon Marius said that it glowed like a candle seen through   a horn.