If you wish to make an apple pie from scratch, you must first invent the universe. – Carl Sagan
No conversation about everything could start without a discussion of, well, everything. We are all born into this universe, and it is, without a doubt, the most compelling mystery we are presented with.
There are many things we don’t understand — life, nature, quantum mechanics – but ultimately these are all byproducts of the infinite expanse that surrounds us.
Well, all right. Technically, the universe isn’t infinite. But I’m sure you’ve seen one of those videos where the Earth is shown in all of its large, beautiful, blue and white glory. But then it starts to pull back, showing Mars nearby, and Venus off closer towards the Sun. Before the camera even manages to pull back from Jupiter, the Earth has become an insignificant speck. But the camera keeps going – the solar system, the Oort cloud, the Milky Way, the local group of galaxies – and so on, until the Earth is nothing more than a dream, lost in a sea of stars. While eventually there would be an edge to the universe, it feels like we’ve reached infinity already.
And we’re stuck somewhere in the middle of it all. It’s difficult to observe our actual location, and our actual situation, because we’re fixed on this tiny grain of sand, trying to see to the other side of the Sahara. And to make matters worse, the distances are so large, that it’s even a strain for light. By the time it reaches us, it is millions of years old. As a result, the images we see in telescopes are not only showing us things that are far away in space, but also far away in time.
This interests me greatly, but it’s also a little disconcerting. On the one hand, our unique circumstance allows us to peer deep into the universe’s past and see how things existed in the early era of the universe. But on the other hand, it means we don’t really know what’s out there. We know what used to be out there. What is likely still happening out there. But we won’t know what’s happening right now until the light reaches us in another thousand, million years.