"david" wrote in message
...
Just a thought but...from our galaxy I think we can see a few others,
Andromeda springs to my ignorant mind. I bleive the nearest is thousand
light years and the furthest a few million. But...

If I built a ship and started off to Andromeda, how would I know when I
had
left the Milky Way? I understand that the edge of the solar system is
defined by lack of solar wind etc, but the galaxy?

David

Simple really, you would know by there being no stars in front of you within
1000 ly.

- Michael