Scattered throughout the universe, spiral galaxies are large congregations of stars, dust, and gas that display extravagant shapes. Recent theoretical work, much of it done on large supercomputers, coupled with new observations of the internal structure and motion of spiral galaxies, are bringing ...
Spiral galaxies are an iconic form. They’re used in product logos and all sorts of other places. We even live in one. And though it may seem kind of obvious how they get their shape, by rotating, that’s not the case. Scientists are still puzzled by spiral galaxies, and how they g...
Astronomersused to wonder why the spiral arms of a galaxy didn't wind themselves up, around the galaxy's core, as the galaxy spun on this majestic timescale in space. Then they figured out that a galaxy's spiral arms must be temporary features: the result of a shock wave moving through...
barred, spiral (NGC 1530 in Camelopardalis) irregular (the Magellanic Clouds, M82 in Ursa Major) In a small telescope like mine, galaxies appear as faint, fuzzy patches. I can see M31 in Andromeda as an angled disc. To see fine detail in galaxies, including lanes of dust across them, yo...
It stood to reason that because the Milky Way was disk-shaped and spiral galaxies were disk-shaped, the Milky Way was probably a spiral galaxy. In the 1930s, astronomer R.J. Trumpler realized that the estimates of the size of the Milky Way galaxy by Kapteyn and others were off because ...
Spiral structure is seen in a variety of natural objects, ranging from plants and animals to tropical cyclones and galaxies. Now researchers at the North Carolina Museum of Natural Sciences have developed a technique to accurately measure the winding arm
[E&S]How do spiral galaxies keep their shape qjshh 2007-08-27 20:35 本文支持点词翻译 Powered by 沪江小D双击或划选(点我安装在线划词),即可查看单词的详细解释,并收录生词进 生词本 The Earth & Sky radio series began broadcasting in 1991, on a few dozen radio stations scattered throughout...
then applied the mixture. Waiting for the bleach to work felt like magic. When I rinsed out the shirts, I was greeted with unique patterns where the bleach had lifted the color. Each shirt was a surprise, revealing designs ranging from spiral galaxies to random abstract shapes. It felt grea...
The parallax method, however, is only the first rung on the cosmic distance ladder, a succession of methods that astronomers use to estimate distances of objects in the universe. At some point, stars andgalaxiesget too distant to have their parallax measured even by the most sensitive of avail...
Spiral structure is seen in a variety of natural objects, ranging from plants and animals to tropical cyclones and galaxies. Now researchers at the North Carolina Museum of Natural Sciences have developed a technique to accurately measure the winding arm