Tag Archives: Prof. Geraint Lewis

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Mars ‘Truthers’ react to NASA’s water announcement [News] Warp speed space travel a possibility [News] “When Hubble was launched in 1990, I was beginning my PhD studies into gravitational lensing, the action of mass bending the paths of light rays as they travel across the universe. Hubble’s image of the massive galaxy cluster, Abell 2218, brings this gravitational lensing into sharp focus, revealing how the massive quantity of dark matter present in the cluster – matter that binds the many hundreds of galaxies together – magnifies the light from sources many times more distant. As you stare deeply into the image, these highly magnified images are apparent as long thin streaks, the distorted views of baby galaxies that would normally be impossible to detect. It gives you pause to think that such gravitational lenses, acting as natural telescopes, use the gravitational pull from invisible matter to reveal amazing detail of the universe […]