This is great: how to demonstrate gravitational concepts using Lycra stretched over a hoop and some weights.
See that red star at top left of Orion? That’s Betelgeuse. It’s a red supergiant. After exhausting the supply of hydrogen in its core it began to contract under its own gravity. Hydrogen fusion resumed in a shell around the core as its density and temperature increased, causing that outer layer to expand and turning it from a so-called “main sequence” star into a bright, luminous giant. Reactions involving helium started as that burned out, blowing the outer envelopes of the star out even further and creating carbon and oxygen (all of which, by the way, has been created in red giant stars). The star will ultimately proceed through multiple stages of fusion, contraction, and more fusion producing ever-heavier elements – neon, magnesium, sodium, silicon, and eventually iron – before collapsing and exploding as a type II supernova.
Betelgeuse and I have had a love-hate relationship since the early ’90s, but I think we’re on good terms these days.Source: burro.astr.cwru.edu
Admit it: you just scratched your own nose, didn’t you?
File under: duh.
(Journal reference: S. Bangalore and F. H. Messerli, Am. J. Med. 126, 873 (2013))
Rainbow on Flickr.
The nine-year-old drew this. The three-year-old took one look at it, said “There’s no indigo,” and wandered off. Kind of proud, to tell the truth.
Muon Move BNL (by Muongminus2)
If I may be serious for a moment:
The Muon g-2 experiment was mounted at Brookhaven National Lab on Long Island to measure the gyromagnetic ratio (“g”) of the muon (a particular type of subatomic particle) in order to test the very precise prediction of its value that follows from the Standard Model of particle physics. It’s being moved to Fermilab, outside Chicago, in order to repeat the measurement with higher precision, taking advantage of the more intense beam of muons available there.
The problem is that the main piece of equipment is a particle storage ring – sort of like a particle accelerator without the actual accelerating function. A lot of it, including 700 tons of magnet steel, has been dismantled and will be moved in pieces. There is a 50-foot diameter set of superconducting electrical coils, however, that has to be moved intact and without flexing by more than a tenth of an inch (and without going out of round by more than a quarter of an inch). The plan? To transport it down the William Floyd Parkway on the custom trailer in the video, then load it on a barge to be towed down the coast, around Florida, across the Gulf of Mexico to Mobile, then up the Tensaw, Tombigbee, Tennessee, Mississippi, Illinois, and Des Plaines Rivers to Lemont, Illinois. From there, it will go back on the hauler for the final overland leg to Fermilab. The entire move, with live GPS mapping, will be tracked on the Muon g-2 experiment website at Fermilab (link).
I’m not a particle physicist, but I’m definitely rooting for the group. It’s just too ridiculous (and I mean that in the best possible way) not to.Source: youtube.com
Ah, the crackpot session: a staple of APS conferences, though not one I’ve ever seen discussed in polite company. I’m disappointed they didn’t mention the checkerboard model of the nucleus, though.