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 Stars like the Sun emit a tiny bit of their light in the X-ray band due to magnetic flaring at their surface. In the 1980-90s, X-ray astronomers found out that young solar-like stars are hundreds or thousands of times more X-ray luminous than the Sun today. But these early studies observed only small samples of young stars with short exposures, and left unanswered many questions.
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Researchers at Penn State are actively in search for planets outside of our solar system. In 1991 Alex Wolszczan of Penn State University discovered the first planet ever found outside our solar system. From there we have begun finding planets elsewhere in our universe.