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Tycho forms such a concentration of light that the inhabitants of the earth can see it without glasses,though at a distance of 240,000 miles! Imagine, then,its intensity to the eye of observers placed at a distance of only fifty miles! Seen through this pure ether, its brilliancy was so intolerable that Barbicane and his friends were obliged to blacken their glasses with the gas smoke before they could bear the splendor. Then silent, scarcely uttering an interjection of admiration,they gazed, they contemplated. All their feelings, all their impressions, were concentrated in that look, as under any violent emotion all life is concentrated at the heart.