Samir’s Selection 07/15/2017 (a.m.)
Reflections on the fine-structure constant >>>
IF YOU give a balloon a modest electric charge—by rubbing it on your jumper, say—you can stick it to the ceiling, thereby both delighting small children and revealing a basic truth about the universe: electromagnetic forces are much stronger than gravitational ones.
More ways to classify planets >>>
A TAXONOMY of planets is emerging fast. On June 19th a group of researchers led by Andrew Howard of the California Institute of Technology divided bodies smaller than Neptune into two classes, based on both their current composition and a consequent presumption about how they formed. Now, another group of astronomers, led by Vardan Adibekyan of the Astrophysics and Space Science Institute in Porto, Portugal, have performed a similar trick on gas giants, the largest type of planet, which are represented in the solar system by Jupiter and Saturn.
Posted from Diigo. The rest of my favorite links are here.