how big is our galaxy? – Thulium Zone

Question: how big is our galaxy?
- Keywords:
  galaxy,
  size,
  space
Asked by killercraft666 to Ryan, Claire, Mako on 16 Jun 2015. This question was also asked by Kiwi_King.
- Ryan Cheale answered on 16 Jun 2015:
  
  100,000 light years across, so if i was to shine a REALLLY bright torch one side it would take 100,000 years for it to reach the other side. Actually interesting this is when modern humans evolved, so the time it takes light to get from one side to the other of our galaxy is about how long modern humans (homosapians) have been on earth!

Question: how big is our galaxy?