What sources caused the reionization of the Universe?

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Yellow Suns, Red and Blue Giants, White Dwarfs – Space is populated by colorful stars. Björn Voss, director of the Planetarium Hamburg, explains its turbulent life cycleHow many stars our universe hosts is unknown. It is estimated that it could be 70 to 700 trillion stars – roughly overturned by the number of galaxies (more than two trillion) and the number of stars per galaxy (100 to 400 billion). With the naked eye, however, we see at least 6,…