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  1. E

    Valve actuator

    I am looking for a method of actuating a valve on a musical instrument. This particular valve needs to rotate 90 degrees, but on some instruments, 120 degrees. I will like to actuate via wire control i.e. with a embedded computer. For example, close a switch, the valve rotates 90 degrees and...
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    Do Quasars exist right now?

    I currently understand that quasars are billions of light years away from us. So the light from those distant quasars that reaches us now, started its journey a billion years ago. When we examine quasars today we are really looking at something that existed a very long time ago and very far...