Hydrogen-deficient star radii. Hydrogen deficiency results from stellar evolution. Over the course of a star's evolution, both the consumption of hydrogen in nuclear fusion and the removal of hydrogen layers by explosive processes can lead to a deficiency of hydrogen in its atmosphere. Detailed theoretical models are still in their infancy. Modeling of hydrogen-deficient star evolution involves either a single-star approach or a binary-star approach. For example, there have been two theories put forward to explain the formation of extreme helium stars. The helium final flash scenario is a single-star approach in which a helium flash serves to consume the hydrogen from
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.