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The Engraved Hourglass Nebula (also known as MyCn 18) is a young planetary nebula in the southern constellation Musca about 8,000 light-years from Earth. It was discovered by Annie Jump Cannon and Margaret W. Mayall during their work on an extended Henry Draper Catalogue (the catalogue was built between 1918 and 1924).
A: Cameron -. Here's what the Smithsonian Institute has to say about Timex Indiglo Watches : Timex received the patent for the Indiglo nightlight in 1988. The nightlight's bluish green light illuminates the entire dial of the watch evenly at the push of a button.The dial is coated with a compound of zinc sulfide mixed with copper, a substance which becomes luminescent when an electrical charge is applied.: John, Indiglo watches take energy from the watch battery and give it to the atoms in the zinc sulfide-copper compound. This energy is then given off as light. After the atoms give off this light they can be exactly the same as they were before they got the energy from the battery.