2025年12月7日
The Sun and Its Missing Colors
Image Credit: Nigel Sharp (NSF), FTS, NSO, KPNO, AURA, NSF
Explanation: It is still not known why the Sun’s light is missing some colors. Here are all the visible colors of the Sun, produced by passing the Sun’s light through a prism-like device. The spectrum was created at the McMath-Pierce Solar Observatory and shows, first off, that although our white-appearing Sun emits light of nearly every color, it appears brightest in yellow-green light. The dark patches in the featured spectrum arise from gas at or above the Sun’s surface absorbing sunlight emitted below. Since different types of gas absorb different colors of light, it is possible to determine what gasses compose the Sun. Helium, for example, was first discovered in 1868 on a solar spectrum and only later found here on Earth. Today, the majority of spectral absorption lines have been identified – but not all.
Free APOD Lecture in Phoenix: Wednesday, December 10 at 7 pm
Tomorrow’s picture: flying over Earth
太阳与其消失的颜色
影像提供: Nigel Sharp (NSF), FTS, NSO, KPNO, AURA, NSF
说明: 目前仍不清楚为何太阳光会缺少某些颜色。这里展示了是太阳光所有可见光的光谱，这些颜色是将太阳光穿过类似稜鏡的装置所产生。该光谱是由麦克马斯-皮尔斯McMath-Pierce 太阳天文台所观测取得，首先显示出，尽管我们的白色外观的太阳几乎发出每一种颜色的光，但它在黄绿色光中最为明亮。特征光谱中的暗斑是由于太阳表面或上方的气体吸收了下方发出的阳光所造成。由于不同类型的气体吸收不同颜色的光，因此可以用于确定太阳的组成气体。例如，氦气是在1868年首次在太阳光谱中被发现，后来才在地球上找到。如今，大多数光谱吸收线已被识别，但仍有部分无法辨识。
凤凰城免费APOD讲座: 12月10日（周三）晚上7点
明日的图片: flying over Earth
