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May 22, 2010 · OΣ 493 was discovered in 1847 and initially measured with a position angle of 26 degrees and a separation of 8.1” When compared with the most recent WDS measures (2010), there’s been very little change in the intervening 163 years, which is not at all surprising considering the primary’s distance of 786 light years as measured by GAIA.
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A parsec (3.26 light-years) is the distance that corresponds to one arcsecond* of parallax, and distance is inversely proportional to parallax (so that Proxima Centauri's parallax of 0.7687 arcseconds corresponds to 1.301 parsecs distance, or 4.243 light-years).
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The Crab Nebula is one of the most studied remains of a stellar explosion and is widely accepted to be due to a supernova seen in the year 1054 a.d. by Chinese, Japanese, Korean, and Arab ...
Nov 27, 2020 · Earth just got 7 km/s faster and about 2000 light-years closer to the supermassive black hole in the center of the Milky Way Galaxy. But don't worry, this doesn't mean that our planet is plunging ...
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Nov 27, 2020 · Earth just got 7 km/s faster and about 2000 light-years closer to the supermassive black hole in the center of the Milky Way Galaxy. But don't worry, this doesn't mean that our planet is plunging ...
(a) (15 points). Consider a planet orbiting 1 Astronomical Units from its parent star, which is 10 light years from Earth. Using the small angle formula, calculate the angular distance on the sky between the planet and the star. Express your answer in arcseconds. (For simplicity, assume that the orbit of the planet is in the plane of the sky).
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Betelgeuse is 642 light years away, which is 6x10^18 meters. The area of a sphere with that diameter is about 10^38 square meters. So 10^-34 of the power emitted from Betelgeuse ends up falling on the ALMA array. According to Wikipedia, the luminosity of Betelgeuse is 90-150 thousand solar luminosity units, which is about 4x10^26 watts.
The aberration of light must therefore take place while light is travelling from the source to the observer. At the point where light originating from a more remote object passes a closer object, the photons from the remote and the closer object must continue to travel side-by-side and continue to show the same behavior from that point onwards.
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Light travels 300,000 km/s. A light year is the distance that light travels in one year. 6. The quote mentioned means that since light takes time to travel through space, anything that we look at is as old as the time it takes for the light from the object to get to us. 12. Our galaxy is a spiral shape with a central bulge. The answer turns out to be 206,265 AU, or 3.26 light-years. This is equal to 3.1 × 10 13 kilometers (in other words, 31 trillion kilometers). We give this unit a special name, the parsec (pc)—derived from “the distance at which we have a par allax of one sec ond.”