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...work. Is Our Sun Normal? Astronomers compare events on other stars to helps us better understand our sun. Mapping the Milky Way The discovery of radio emissions from the Milky Way, and the theory of dark-matter. The Shape of Our Galaxy Infra-red satellites. The DIRBE experiment on NASA's Cosmic Explorer opened a new window into the Milky Way. The Scale of Our Galaxy A...

...work out how long it has taken to fall. Mathematics provides a natural medium for rational argument. Given an equation that relates various quantities, the rules of mathematics allow that equation to be re-expressed in a number of different but logically equivalent ways, all of which are valid if the original equation was valid. Given two equations, mathematical reasoning...

...working tool steel (Fe–5Cr) D2 ASP30, produced by hot isostatic compaction. The coating grows by reaction of the carbide-former and carbon atoms diffusing from the matrix. The hardness of the vanadium carbide layer is in excess of 3000 VPN, which is higher than most other similar processes. Very hard carbide layers provide excellent wear resistance to steel and, in some...