Solar History (IMAGE) Southwest Research Institute Caption A team led by SwRI integrated a sunspot drawing made by Hevelius in 1644 (top) with images from NASA's Solar Dynamics Observatory to illustrate how widely varying telescopes and observation techniques can affect data. The team integrated data from 700 observations to assess the reliability of historical data, to better understand the history of solar activity. Credit NASA/SDO/SwRI Usage Restrictions Images/Videos may be used by the public for educational and informational purposes only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.