MEDIUM
11th CBSE
IMPORTANT
Earn 100

How many astronomical units (A.U) make 1 parsec?
 

Important Questions on Units and Measurement

HARD
11th CBSE
IMPORTANT
Consider a sun like a star at a distance of 2 parsec. When it is seen through a telescope with magnification, what should be angular size of the star? Sun appears to be 1/2° from the earth due to atmospheric fluctuations, eye cannot resolve objects smaller than 1 arc minute.
 
MEDIUM
11th CBSE
IMPORTANT
Mars has approximately half of earth's diameter. When it is closest to earth, it is at about 12 A.U. from the earth. Calculate what size it will appear when seen through the same telescope. (Comment: This is to illustrate why a telescope can magnify planets but not stars.)