Astronomers gravitate toward Einstein's telescope

Scientists are harnessing the cosmos as a scientific 'instrument' in their quest to determine the makeup of the Universe. The University of Chicago's Evalyn Gates calls the instrument 'Einstein's telescope.' The instrument is actually the phenomenon of gravitational lensing, which acts as a sort of natural telescope. Gates's new book, Einstein's Telescope: The Hunt for Dark Matter and Dark Energy in the Universe, explains how it works...

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