Physics P7 OCR 21st century

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Distances to the stars 

Distances are given in parsecs to stars or mega parsecs to galaxies which is the same as 1000 parsecs and the angle that they are away from us is measured in arc seconds and this is equal to to 1/ 3600 of an arc

IT IS STRONGLY ADVISED THAT YOU BRUSH UP ON TRIGONOMATORY!  (remember soh cah toa from maths)?

stars that are far away from us have a very small parallax angle which makes it very hard to get an accurate measurement of he

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zaheer mushtaq

no help foo

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