If you want to find the size of a basketball, you can use a normal meter stick to measure the diameter. You should get a value of around 0.24 meters. Please don't use inches—they are just harder to ...
Extra stellar systems are so far away from our own that we couldn’t even hope of developing a tape measure long enough to determine how far away they really are. On the other hand, astronomers can ...
The Nature Network on MSN
How astronomers measure distance without travelling anywhere
It’s a bit mind-bending to realise that everything we know about the scale of the universe comes from people stuck […] ...
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