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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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Bilkuin Jimi Salih doesn’t remember how old he was when he learned to dive, only, that all the men in his family can do it.
It might have been his grandfather who taught him, or his father, or even an uncle or cousin. He recalls swimming dozens of feet underwater among the reefs, collecting spider conches, abalone and sea cucumbers to sell at the local fish market.
“One of our specialties is that, because we live on the sea and we’re always in the sea, we can dive in the water for a long time,” says Salih, via a translator. “We learn by observing, and from there, we develop our own technique.”
To most people, Salih’s free diving skills are highly unusual; but not to his community. Salih is Bajau Laut, an indigenous seafaring group in Southeast Asia that has lived a semi-nomadic lifestyle on the ocean for centuries. Living on boats and fishing for income and sustenance, the Bajau Laut aren’t just reliant on the sea: they’re biologically adapted to it, with larger spleens that give them the ability to hold their breath for far longer than the average person.
“We’re very comfortable in the water,” says Salih. The 20-year-old was born on board a lepa, a type of houseboat, on the shore of Omadal Island, off the coast of Semporna in Malaysian Borneo.