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How come your reflection in the bowl of a spoon is upside down? asks reader Matthew Wiegert. An ordinary mirror is made by coating one surface of a piece of glass with a thin layer of metal, like silver or aluminum. It’s this shiny metal that reflects your image. So a shiny, scratch-free metal spoon, [...] How come there are bars in some galaxies? Or is this an illusion? asks George W. Bowman. Actually, there are bars at the center of most spiral-shaped galaxies. But you won’t find any drunken Wookies or neon Budweiser signs, only vast sweeps of dust and stars. A barred spiral galaxy Galaxies are enormous, turning [...] |
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