No screaming "GET IN THE 20thCENTURY" there. *They make working in the appropriate scheme easier*.ĮV: precisely the same point. Parsec is a different derivation DONE FOR PRECISELY the same reason as feet, chain, acres, link, fathoms, pounds, hundredweight, and so on. AU for the same reason to get to planets in our solar system. Light year is not given the same vitriol because in that case, it's hard to use "metric order"meters away to a star. change "meter" to feet and it becomes obvious why it's %$&*%$ing stupid. How many feet in a kilofeet? 100% exactly the same as the crowing "How many meters in a kilometer?" they think so very smart. The Imperial system is 100% as good as the metric one. However, metric doesn't have a benefit there: there is no unit change. Yes, conversion from one unit to another unit is a caclulation. Like their opening go-to strawmen "How many miles to a hogshead do you get?" Jason, my peeve with "defenders" of the metric system (who are really "Attackers of the imperial system" - they want people who use or like imperial TO BE WRONG - is that their arguments are so mindbogglingly stupid. This is the trajectory the Voyagers are following. If you launch from circular orbit much faster than escape velocity, than instead of being on a parabolic trajectory, you'll follow a hyperbola, and have a residual velocity even out at infinity. In this state, you'll travel off to infinity, but constantly slowing down such that (asymptotically), you would come to rest when you got out to infinity. At 7 km/s, that ellipse becomes stretched out "all the way to infinity," and you reach the barely "unbound orbit" parabolic state, known as escape velocity. Keep increasing, and the ellipse becomes more and more stretched out (eccentric). Somewhere in there you'll hit the particular orbit shown in Ethan's figure. If you start with the simple circular orbit, then as you gradually increase your tangential speed, your orbit becomes more and more elliptical (but still bound). Fisher #3: Each of the orbits shown in figure #3 are just examples.
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