"Use Google Earth in sky mode and you immediately gain access to an impressive set of images of the universe. Animations show the movement of the planets across the sky and there is an option to superimpose images from the Hubble Space Telescope over the relevant regions of the cosmos.
"All in all, an impressive experience. But there's still room for improvement, say Jiangang Hao and James Annis at the Fermi National Accelerator Laboratory in Batavia. They point out that Google uses low resolution images of the night sky to improve the speed at which they load. The result is that Google Sky shows only a small fraction of the galaxy clusters that have been photographed to date."
Physics arXiv: the Physics arXiv Blog
Paper:
Google Earth Astronomy
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