thoughts on cosmologyPosted: February 11, 2016
I try hard to keep this straight in my mind: what is the difference between dark matter and dark energy?
If I have paid proper attention to public radio’s Science Friday, I think I have a handle on this. Dark matter accounts for the missing matter of the universe, based on astronomers’ calculations. Dark energy accounts for the expansion of the universe.
In her book Dark Matter and the Dinosaurs (review coming when I’ve finished it) author Lisa Randall points out that dark energy is uniform throughout the universe, but dark matter is lumpy, existing in different consistencies in different places.
There was a time when cosmologists thought that the expanding universe would snap back and create in essence a new Big Bang. Very consistent with Hindu cosmology.
More recent thinking, as I understand it, says that there is not enough energy to do that. Rather, the universe will keep expanding until it cools off into nothingness. “Not with a bang, but a whimper.”
Depressing, except for the fact that we won’t be around to see which theory is correct.
And in any case, we have more pressing matters to address here and now. While the drought is perhaps abating in the northern part of California, it is still an unpleasant reality here in the Southland.
Then there’s that presidential election of 2016.
Waiting, Linda Ellerbee, for you to say, “And so it goes.”