The online astronomy office hours from the UofA continue apace. Every week Prof. Chris Impey answers ex tempore a mix of questions from planetary science to the fate of the universe from a thirsty audience across the globe. A large Indian contingent stays up until the wee small hours of their morning to join in. Part of the fun is pausing the video and trying to figure out the answer from basic considerations before resuming. It is fun to be right but more instructive to be wrong. I’ve been moved to send in three questions over the past couple of sessions and all have been answered.
When in relation to the Big Bang did dark matter originate?
The third video from Corning’s Museum of Glass shows that the path to science is not always smooth and that learning from mistakes is the norm. The original 200 inch pyrex disk for the Palomar primary did not go according to plan and had to be recast. The second attempt succeeded and even so, it took ten years of painstaking grinding and polishing at Caltech before it was ready for use.
Stoppard’s occasionally engaging and frequently frustrating play puts two minor characters from ‘Hamlet’ in a universe where physical laws don’t apply, free will is an illusion, insanity is the norm, and a hideous fate inevitable. Sounds eerily familiar.
I have always imagined that Paradise will be a kind of library
— J.L. Borges
No, I haven’t read any Borges but this is one of those quotes that is very popular with my ilk. But, libraries are indeed wonderful things and I remember hanging out a lot – and later volunteering – at the old Albany (California) Public Library on Solano Avenue in the late 1970s. Don’t look for it there now, it is a youth center affiliated with the YMCA. I spent as much time at the Doe and Bancroft as any science major at Cal could. The specialty books and journals were in Hildebrand Hall but the atmosphere in the general purpose stacks was unbeatable. The Internet has obliterated what little attention span I once had so sitting down and reading a physical book is next to impossible and yet the lure, the promise, and the perfume of endless shelves of books is still strong.
“Objectivity” is one of Brady Haran‘s strongest and most addicting channels. Most of the episodes are filmed at the Royal Society‘s Library in London and feature Keith Moore, the hypnotic and wildly popular head librarian who pulls from a bottomless collection of manuscripts, paintings, sculptures, and instruments from Newton to the present. The Brits were pieces of work for several hundred years but there can be no denying that they made a few positive contributions to somewhat offset their spherical bastardy.
Visiting the Society’s collections may just be sufficient to deal with the rigors of travel in whatever a post-COVID landscape may look like as well as London’s notoriously high prices.
Enjoy the long-requested Q&A with The Man which includes a very candid answer to a probing viewer question. Be sure to check out the rest of the channel – some selections below.
But the early universe was very hot, very dense, and gravitationally very different from the comfortable-to-us 1 g we experience today on the surface of the earth. Einstein has convincingly shown that spacetime is accordingly divorced from that human experience. Clocks, for example, are affected by gravity and satnav constellations have to take this into account. Did the first three minutes flow the same way three minutes flow in the here and now? I sent that question to Chris Impey’s online office hour and he kindly answered. It is a tantalizing response and one that will require substantial further study to fully appreciate – perhaps finally diving into the guts of GR. It makes me wonder even more intensely why we anthropomorphize those intervals the way we do.