Red giant brightness so common on both types of stars. Red giants are evolved from main-sequence stars with masses in the range from about to around . When a star initially forms from a collapsing molecular cloud in the interstellar medium, it contains primarily hydrogen and helium, with trace amounts of "metals" (in stellar structure, this simply refers to "any" element that is not hydrogen or helium i.e. atomic number greater than 2). These elements are all uniformly mixed throughout the star. The star reaches the main sequence when the core reaches a temperature high enough to begin fusing hydrogen (a few
Red Hydrogen One price and flagship ambitions." In contrast, "The Verge" gave the Hydrogen One a score of 3 out of 10, arguing that it "fell short" of the quality expected among phones in its price range, and acknowledging the shortcomings of the features that were intended to set the Hydrogen One apart from them. Red Hydrogen One Red Hydrogen One is an Android smartphone manufactured by Red Digital Cinema. It was officially announced on May 18, 2018 with a release date in August 2018. and released in the United States via AT&T and Verizon Wireless on November 2, 2018 after multiple delays.