It is surely the first song to be written about what happens to middle-aged women: "tangible not visible like gravity or the air".
Oddly it's Mr. Perpener, a dance historian, who anchors "Visible" with the gravity it deserves and the lightness it needs.
In these well-predicted flames, however, subtle differences existed in fuel/air mixing between measurement and computation, in which the contrast was most visible in normal gravity.
The installation is meant to evoke, "human fascination with natural phenomena," and the wonder of making invisible forces like gravity visible.
Most galaxies rotate at a speed that should cause them to fly apart if all that holds their visible matter together is gravity.
Most galaxies rotate at a speed that should cause them to fly apart if all that holds their visible matter together is gravity, as physicists understand it.
They think the universe is stuffed with invisible matter composed of particles different from the ones that make up visible matter and the gravity of this "dark" matter holds galaxies together.
The discoveries seemed to fit nicely with the longstanding observation that galaxies like the Milky Way spin too fast to be held together only by the gravity of visible matter -- a main argument for the existence of dark matter in the universe.
The work provides more evidence that dark matter, even on the largest scale, strongly affects the visible cosmos with its gravity and remains virtually unaffected in return.
Galaxies like the Milky Way are surrounded by swarms of ancient stars, called globular clusters, which orbit the center of the galaxy faster than the gravity of visible matter alone can explain.
