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|How Long We See At Space?
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Posted by Wondering? on July 28, 1998 23:53:02 UTC
How long we really see at Spece?
I made paper-cone. I look throught this cone at Space. Some point in this cone is light-source.
How i can know; What is distance between me and light-source?
I dont know what is size of that light-source. I know only, that light has some maximum speed.
If electric lamp is that light-source, i dont know how far away it is. I must know first, what is power (example 60W) of that lamp.
If some sun, or Galaxy is that light-source. How do i know distance, because i dont know it's size and it's power?
When we measure at Space-distances, we speak long distances. Pythagoras triangle-methods work only short distances.
Same measuring-error problem is also, radiosignal-measuring systems.
I explain more. If i see some thing, which has form, and if i dont know, what is size of this form, i cannot say it's size, or distance of if it to me.
When we look to Space, we dont know that distance of some light-source, only that we measure it's 'light-power'.
My question is. HOW LONG WE REALLY SEE AT SPACE? WHAT IS SIZE OF THIS SPACE-BALL, WHAT WE CAN REALLY DRAW?
Please. Dont give me some old answers to your memoryes. Please. Say me. How it is possible to measure long distance.
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