3 ms·
I think your scale is off a bit. I'm not sure what "these far off galaxies" refers to, but according to this Wikipedia page: http://en.wikipedia.org/wiki/Li
by phr 16y ago
I think your scale is off a bit. I'm not sure what "these far off galaxies" refers to, but according to this Wikipedia page:
http://en.wikipedia.org/wiki/List_of_nearest_galaxies
all the local group galaxies are within 10 million light years of Earth.
For that matter, some of the "life is everywhere" theories assume many space-faring civilizations within our own Milky Way galaxy, which is only(!) about 100,000 light years across.
- jussij 16y agoWith a univers estimated at some 4 billion light years in size, I choose 100 million light years as a ball park figure. But lets assume these aliens are in fact our neighbours and live just a million light years away. If they are planning to pop over for a visit, it's going to take them a very long time to get here. Unless of course Einstein is wrong and in reality it is possible to travel faster than the speed of light.