Theories about dark energy – mind-bending, highly creative, and occasionally nuts

Like all the rest of us, scientists are magical thinkers.  You can most easily see this when scientists struggle to explain an unexpected result, like the accelerating expansion of the universe.  In Slate, Matthew Francis runs through some of the made-up theories that haven’t yet been proven wrong or right.  These are barely distinguishable from superstition or science fiction.  And the vast majority – probably, in the long run, all of them – are likely to be proven wrong.  “Dark energy” itself is an invented concept whose sole purpose is to explain an unexpected observation.  As I understand it, there is no “energy” that scientists can identify, and the word “dark” is used solely to indicate that we don’t know what we’re talking about.

An unexpected observation cries out for explanation that will yield expected observations (predictions).  So scientist strive to make up stories that will lead to better predictions.  But there’s no reason to think that those stories actually correspond to what is out there in the universe.  There is also no reason at all to think that the realities of the natural world can be described accurately by human language.

But scientists have no other way to communicate about their findings than to use language, either co-opting words that already have some other meaning (e.g., “dark”) or creating words (e.g, “quark”).  I’m pretty sure that these words have no meaning outside their scientific context.




Neil deGrasse Tyson responds to the “God voice”

The New Yorker profiles Neil deGrasse Tyson (behind paywall):

“Tyson refuses to take explicit political positions in public, or to criticize elected officials, even those who reject evolution; he would rather invest his energies in creating a more enlightened electorate.”

This seems much better than the Bill Nye approach.  Arguing with creationists is a losing game.

He also gives us a glimpse into the childhood visit to the Hayden Planetarium that turned him onto astronomy:

“After that one session with the deep voice of the planetarium director – the God voice – resonating in the cavity of the dome, looking at the universe.  That is some pretty impactful life experience.”