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.

• Re: How long we see at Space? - Mikro. - August 3, 1998 - 04:07 UTC