However, it is difficult to make large objective lenses (greater than 4 inches or 10 centimeters) for refractors. Refractors are relatively expensive, if you consider the cost per unit of aperture. Because the aperture is limited, a refractor is less useful for observing faint, deep-sky ...
However, it is difficult to make large objective lenses (greater than 4 inches or 10 centimeters) for refractors. Refractors are relatively expensive, if you consider the cost per unit of aperture. Because the aperture is limited, a refractor is less useful for observing faint, deep-sky ...
When comparing atoms to larger objects — with a large disparity in size — orders of magnitude show how to quantify the size differences. Orders of magnitude allow you to compare the approximate value of an extremely small object, such as the mass or diameter of an atom, to a much larger...
What is 70 inches in feet? One of the buried pyramids has a height of 250 feet and a square base with a side length of 340 feet How much sand to the nearest thousand cubic feet is displaced by the pyramid? What is the conversion factor for converting meters to centimeters? What are ...
A diagram showing how snowflakes form in clouds.(Image credit: OSweetNature via Shutterstock) The reason snow crystals top out at that size is due to the wind. "The main limit on size is just that these large crystals are quite fragile," he said. "They have to grow quickly, and if ...
At the time, the Cold War was in full throttle, and the US and Soviets had their measuring sticks out for an internationally-televised penis-measuring contest. With the successful launch of Sputnik, the Soviet penis bolted out by a few centimeters, horrifying the Americans. ...
For gold shown on a ruler be sure to note whether it is on a metric ruler or a standard inch ruler. Yes some sellers will still try to pull that old centimeters vs inches trick! Also beware of sellers who fail to list the weight in grams of their gold. Gold weights should be ...
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However, it is difficult to make large objective lenses (greater than 4 inches or 10 centimeters) for refractors. Refractors are relatively expensive, if you consider the cost per unit of aperture. Because the aperture is limited, a refractor is less useful for observing faint, deep-sky ...
However, it is difficult to make large objective lenses (greater than 4 inches or 10 centimeters) for refractors. Refractors are relatively expensive, if you consider the cost per unit of aperture. Because the aperture is limited, a refractor is less useful for observing faint, deep-sky ...