Mario Livio Mario Livio

This image made by the NASA/ESA Hubble Space Telescope shows part of a group of five galaxies known as Stephan's Quintet. NASA, ESA, Hubble SM4 ERO Team /AP hide caption

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NASA, ESA, Hubble SM4 ERO Team /AP

'Are We Alone?' Churchill Concludes It's Likely Life Circles Other Suns

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William Thomson Kelvin (1824 - 1907) who proposed the absolute or Kelvin temperature scale. He also established the second law of thermo-dynamics. He was brilliant. But he wasn't perfect. W. & D. Downey/Getty Images hide caption

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W. & D. Downey/Getty Images