盖亚：太阳来了
(原标题: Gaia: Here Comes the Sun)
2024-08-04
浏览次数: 14
从银河系外返回地球会是什么样子？尽管是为了回答更大的问题而设计的，但来自欧空局机器人盖亚任务的数据正在帮助提供一个独特的现代视角来看待人类在宇宙中的地位。盖亚在靠近地球的地方绕太阳运行，并精确地分辨恒星的位置，以至于它可以确定在一年的时间里，它的有利位置会发生轻微的变化，对于距离较远的恒星来说，这种变化相对较小，从而决定了距离。在视频的第一个序列中，显示了银河系的插图，很快就解析成盖亚星数据的三维可视化。一些著名的恒星被标记为它们的共同名称，而其他恒星被标记为盖亚星表中的数字。最后，观众到达了我们的恒星附近，盖亚跟踪了许多恒星，很快就到了我们的主星太阳。在视频的最后，太阳的第三颗行星的反射光变得可见：地球。
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What would it look like to return home from outside our galaxy? Although designed to answer greater questions, data from ESA's robotic Gaia mission is helping to provide a uniquely modern perspective on humanity's place in the universe. Gaia orbits the Sun near the Earth and resolves stars' positions so precisely that it can determine a slight shift from its changing vantage point over the course of a year, a shift that is proportionately smaller for more distant stars -- and so determines distance. In the first sequence of the video, an illustration of the Milky Way is shown that soon resolves into a three-dimensional visualization of Gaia star data. A few notable stars are labelled with their common names, while others stars are labelled with numbers from a Gaia catalog. Eventually, the viewer arrives in our stellar neighborhood where many stars were tracked by Gaia, and soon at our home star Sol, the Sun. At the video's end, the reflective glow of Sol's third planet becomes visible: Earth.