RR Lyrae distance estimate of . This type of low-mass star has consumed the hydrogen at its core, evolved away from the main sequence, and passed through the red giant stage. Energy is now being produced by the thermonuclear fusion of helium at its core, and the star has entered an evolutionary stage called the horizontal branch (HB). The effective temperature of an HB star's outer envelope will gradually increase over time. When its resulting stellar classification enters a range known as the instability strip—typically at stellar class A—the outer envelope can begin to pulsate. RR Lyrae shows just such a regular
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.