当地的绒毛
(原标题: The Local Fluff)
2024-12-22
浏览次数: 17
星星并不孤单。在我们银河系的圆盘中，大约10%的可见物质以气体的形式存在，称为星际介质（ISM）。ISM不是统一的，甚至在太阳附近也显示出斑块。要探测到本地的ISM是相当困难的，因为它非常脆弱，而且发出的光很少。然而，这种主要是氢气的气体吸收了一些非常特殊的颜色，这些颜色可以在最近的恒星的光线中检测到。这是一张20光年范围内的星际边界探测卫星（IBEX）正在进行的观测和粒子探测的工作地图。这些观测表明，我们的太阳正在穿过一个本地星际云，因为这个云从天蝎座-半人马座联合恒星形成区域向外流动。在接下来的一万年里，我们的太阳可能会离开本地云，也被称为本地绒毛。关于当地的ISM还有很多未知之处，包括它的分布、起源以及它如何影响太阳和地球的细节。出乎意料的是，IBEX宇宙飞船的测量结果表明，中性星际粒子流过太阳系的方向正在发生变化。APOD年度回顾：2024年夜空网络演示
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The stars are not alone. In the disk of our Milky Way Galaxy, about 10 percent of visible matter is in the form of gas called the interstellar medium (ISM). The ISM is not uniform and shows patchiness even near our Sun. It can be quite difficult to detect the local ISM because it is so tenuous and emits so little light. This mostly hydrogen gas, however, absorbs some very specific colors that can be detected in the light of the nearest stars. A working map of the local ISM within 20 light-years, based on ongoing observations and particle detections from the Earth-orbiting Interstellar Boundary Explorer satellite (IBEX), is shown here. These observations indicate that our Sun is moving through a Local Interstellar Cloud as this cloud flows outwards from the Scorpius-Centaurus Association star forming region. Our Sun may exit the Local Cloud, also called the Local Fluff, during the next 10,000 years. Much remains unknown about the local ISM, including details of its distribution, its origin, and how it affects the Sun and the Earth. Unexpectedly, IBEX spacecraft measurements indicate that the direction from which neutral interstellar particles flow through our Solar System is changing. APOD Year in Review: Night Sky Network Presentation for 2024