An astronomer sees two stars in the sky. Both stars are equally far from Earth, but the first star is dimmer than the second star. Which of the following is a valid conclusion about the first star?

Question

anonymous · Answer

what are the options?

anonymous · Answer

It is larger than the second star. 

 It is smaller than the second star. 

 It is older than the second star. 

 It is younger than the second star.

anonymous · Answer

i think.. older .. cause if its older then maybe it has burnt out .. but if its a red giant or something then it would be brighter ... so i don't really know :-/