In the boundless optimism of my teenage years I thought that this galaxy was thriving with intelligent life and that it was just a matter of time before they contacted us or we found evidence of them.
The older and wiser me now considers the human race to probably be the only intelligent species in this, the Milky Way galaxy. Which, if I’m right, will be ours for the taking, providing we can overcome our innate tendencies towards xenophobia, violence and resource hoarding.
The flip side of this is that such a proposition would mean that the wider universe might be teeming with intelligent life. If, on average, only one intelligent species evolves in each sufficiently large galaxy, then we are it for the Milky Way and our nearest intelligent neighbours would be 2.5 million light years away in M31 in Andromeda.
The vast distances between galaxies and the vast timescales involved in communicating with them effectively means that we will never make two-way contact with any other intelligent species. If we get lucky we might detect their presence in another galaxy, but that would be their past presence and not their current presence.
By the time we detect a signal from millions of light years away and then send a reply, many more millions of years will have elapsed before our message is received. What are the chances that the species we detected still exists? Not very high. But that’s just my opinion.
Anyway, given the fact the current estimates put the number of large galaxies in the observable universe between hundreds of billions and 1 or 2 trillion, that could be the number of intelligent species in the universe. So, in the context of my proposal, it is thriving with life.
The cruel twist in this tale is that all intelligent species are likely to live out their lives either never knowing if they are alone or knowing that they aren’t alone but being unable to communicate with each other. The speed of light and the vast distances will see to that.
Thank you,
Walter.