Citizen Science – Nonstop – For a Century

20-Million Milestone for 100-Year Citizen Science Project

"A citizen science project running for over 100 years reached a key milestone this month when an amateur astronomer contributed the 20 millionth observation of a variable star on February 19, 2011. A variable star changes in brightness over time. Records of these changes can be used to uncover the astrophysical processes within evolving star systems. With a database going back over a century, variable star astronomers have access to a data source unparalleled in astronomy."

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