heehaw wrote:Will humans ever go to the Fornax galaxies? ...
Well, as Geck said, you've set up a false dichotomy. Let's run some numbers to see how they compare...
On average, Mars is 12.5 light-minutes from Earth, or about 1/42077 of a light-year.
The Fornax galaxy cluster is said to be 62 light-years away.
So the Earth to Mars distance is 1/2608762 of the distance to the Fornax cluster.
Humans messing around in boats managed to get from the English isle to the isle of Ireland, a crossing of about 20 km.
From Ireland to, say, Newfoundland is about 3220 km.
The ratio of the first of those to the second is about 1/161.
Comparing our spaced-out 1/2608762 to the all-wet 1/161, we find that the sea crossing is less difficult (only in terms of relative distance travelled) than our space voyage by a factor of about 16200.
But I've just compared kilometers to light-years! I can fix that: a ly is 9.461e+12 km, so the actual distances being compared work out to a ratio of 8.332e+15. (Anything with 15 zeros after it is A Really Big Number.) We should divide that by some suitable ratio based on the speed for each mode of travel, but that's where things get a bit dicey...
Not only do we not know how fast the first Irish paddled, but the above calculation carries with it the implication that with advances in technology, we can travel at the speed of light. But we know of no technology that can get us anywhere near the speed of light. The best being thought of today might get us towards 10% of light-speed, at what is likely to be extreme risk to all aboard. So we need to add (at minimum) a further factor of 10, making the space voyage about 8.332e+16 times longer (still ignoring the required -- but my head hurts -- speed ratio) than the wandering surfers experienced.
In short, we'd need to have some sort of technology that would appear to us today to be magic to have any hope of trying such a trip. I can just stretch my mind to encompass some short interstellar travel in the coming centuries, by a few crazy explorers or in-stasis colonists -- but more likely, just by bots.
I must conclude that, compared to wandering around our corner of our galaxy, the Fornax cluster is beyond unreachable.