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Transit Of Venus Reveals Secrets Of Universe

Twice every 100 years or so, Venus crosses the face of the Sun. It's like an eclipse, except Venus will look like a pea in a yellow saucer. But the transit has a storied history — it showed for the first time that other planets have an atmosphere, and also allowed astronomers to calculate the scale of the solar system. This year offers yet another possibility — the transit will help astronomers figure out which planets orbiting other suns in the universe have atmospheres, and maybe life.