Word: disks
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There was a time not too long ago when you could walk down the street without seeing white, brightly colored or bedazzled earbuds jammed into everyone's ears. Just as the iPod has revolutionized the way we buy music, the small, disk-shaped earbuds that come bundled with it have changed the way we listen to music. But not in a good way. Aside from being uncomfortable and prone to falling out, earbuds sit outside the ear canal and leave room for lots of ambient noise to seep in, leading many of us to turn up the volume dangerously high...
...Water Museum Mülheim in Cologne. They involved a series of installations housed inside the gallery space of a large water tower-turned-museum. One installation measured the magnetic field surrounding visitors who entered the space, which in turn caused glowing water to flow across a large disk on the gallery floor...
...doing so, he brings out nuances in the music. The second piece, “Double,” features a circle of men whose dance forms a large, tilting disk. “It’s one of the most beautiful things you have ever done,” Dyer told Morris during the talk...
Here's the basic difference: when the planets in our solar system first formed, they were swimming through a disk-shaped cloud of gas. Their passage roiled and compressed the gas, and the gravity of the compressed gas in turn pulled on the proto-planets. The original models suggested that the net effect would have been to drag the proto-planets inward - and while the drag would have stopped as the gas eventually dissipated, it would have been too late. They would long since have fallen into...
Eventually, the disk of gas dissipates, and the proto-planets are fixed in their permanent orbits. Exactly where those orbits lie depends on all sorts of factors peculiar to a given planetary system - how much material there is in the original proto-planetary disk, how much of that is dust and how much is gas, how big the dust grains are, how hot the star is and more. That's one reason we should expect each solar system to look a little bit different. Which, as it turns out, they...