Advice for stirring your online community and fostering engagement

by Super User

Oct 12, 2017

Advice for stirring your online community and fostering engagement

When you enter into any new area of science, you almost always find

yourself with a baffling new language of technical terms to learn before you can converse with the experts. This is certainly true in astronomy both in terms of terms that refer to the cosmos and terms that describe the tools of the trade, the most prevalent being the telescope. So to get us off of first base, let’s define some of the key terms that pertain to telescopes to help you be able to talk to them more intelligently. The first area of specialization in telescopes has to do with the types of telescopes people use. The three designs of telescopes that most people use are the Refractor, the Reflector and the Schmidt Cassegrain telescope. The refractor telescope uses a convex lens to focus the light on the eyepiece. The reflector telescope has a concave lens which means it bends in. It uses mirrors to focus the image that you eventually see. The Schmidt Cassegrain telescope uses an involved system of mirrors to capture the image you want to see. A binocular telescope uses a set of telescopes mounted and synchronized so your view of the sky is 3-D. Beyond the basic types, other terms refer to parts of the telescope or to the science behind how telescopes work. Collimation is a term for how well tuned the telescope is to give you a good clear image of what you are looking at. You want your telescope to have good collimation so you are not getting a false image of the celestial body. Aperture is a fancy word for how big the lens of your telescope is. But it’s an important word because the aperture of the lens is the key to how powerful your telescope is. Magnification has nothing to do with it, its all in the aperture.

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Advice for stirring your online community and fostering engagement

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Eugenesog

Monday, 23 September 2024 11:03

Drought-hit Danube River reveals scuttled German World War II ships
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The wrecks of explosives-laden Nazi ships sunk in the Danube River during World War II have emerged near Serbia’s river port town of Prahovo, after a drought in July and August that saw the river’s water level drop.

Four vessels dating from before 1950 have also come to light in Hungary’s Danube-Drava National Park near Mohacs, where the Danube’s water level stood at only 1.5 meters (4.9 feet) on Tuesday, the lingering effect of severe heat waves and persistent drought in July and August.

The vessels revealed in Prahovo were among hundreds scuttled along the Danube by Nazi Germany’s Black Sea fleet in 1944 as they retreated from advancing Soviet forces, destroying the ships themselves. The wrecks can hamper river traffic during low water levels.
Strewn across the riverbed, some of the ships still have turrets, command bridges, broken masts and twisted hulls, while others lie mostly submerged under sandbanks.

Endre Sztellik, a guard at the Danube-Drava national park, said of one of the ships, “we still don’t know what this is exactly. What is visible and an unfortunate fact is that the wreck is diminishing as people are interested in it and parts of it are going missing.”
The Danube stood at 1.17 meters (3.8 feet) in Budapest on Tuesday, which compares with an all-time record low of around 0.4 meters (1.3 feet) registered in October 2018. During floods, the Danube rises well above 6 meters (19.7 feet).

“Eastern Europe is experiencing critical drought conditions that are affecting crops and vegetation,” the European climate service Copernicus said on its website in its latest drought report, published earlier this month.

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