There’s a new ultraviolet eye in the sky. Last week, NASA launched the Far Ultraviolet Spectroscopic Explorer, an Earth-orbiting telescope that should help astronomers understand what was going on in the moments after the birth of the Universe. Hydrogen and deuterium were created in the big bang, and astronomers can measure their relative abundance in the cosmos by studying their characteristic emissions in the ultraviolet spectrum. The greater the ratio of hydrogen to deuterium,
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