Since prehistoric times, people have watched the moon waxing and waning through its phases. Four hundred years ago, Galileo was the first to observe similar phases of the planet Venus. Now, for the first time, astronomers have seen the changing phases of a planet outside of our solar system. They expect similar observations in the future to reveal important details about the atmosphere, cloud cover, and climate of planets orbiting other stars.
Full article by Govert Schilling on ScienceNOW
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