Lumas are star-like creatures that first appear in Super Mario Galaxy. Unlike most Stars, they have a raindrop-like shape and come in many colors, with the most common one being yellow. They are much like Power Stars, but they are more circular and have the ability to talk. The Lumas are each very friendly and assist Mario during his quest. Lumas have the ability to transform, from minor planetoids to entire galaxies, and according to Rosalina, some Lumas can even transform into Power Stars. The above text is from the Super Mario Wiki and is available under a Creative Commons license. Attribution must be provided through a list of authors or a link back to the original article. Source: https://www.mariowiki.com/Luma