Save $100 on this 5-inch telescope and enjoy views of Saturn's rings, the belts of Jupiter and bright deep space objects like ...

The telescope housed inside it — the Hooker 100-inch telescope — was completed in 1917 and reigned as the world’s largest optical telescope until 1949.

AS time passes and astronomical work advances there is a greater demand, year by year, for more powerful instruments of research. Fortunately, instrument makers have so far been able to fulfil the ...

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Price history: It's been cheaper during previous Prime Day and Black Friday events, but this price of $679 is the best we've ...

"Installed in the 100-inch telescope dome at Mount Wilson Observatory, "Of Sea and Sky" connects around themes of truth-seeking, Earth ecology, and space cosmology, as well as sensitivities to the ...

With a 100-inch (2.5-meter) diameter mirror for collecting light, the Hooker telescope at Mount Wilson was the largest telescope at the time. Large telescopes are not only more sensitive to ...

Mount Wilson’s 100-inch telescope showed him the exploding universe, but it raised more questions than it answered. Bubble’s theory needed the 200-inch to prove or disprove it conclusively.

A 2-inch telescope will have a primary or “objective” lens with an aperture of about 3 square inches. The lens in a 4-inch telescope has a much larger 12-square-inch light collecting area.

Cat # 272 Taken with Palomar Observatories 100 inch telescope.” Image Credit: Carnegie Institute of Science via NASA. 1990: Hubble Space Telescope ...