isaac gracie - isaac gracie
Genre: Alternative
Released: 2018/04/13
Copyright: A Virgin EMI Records release; ℗ 2018 Buried Crowns Ltd, under exclusive license to Universal Music Operations Limited
Tracklist:
01 terrified
02 last words
03 the death of you & i
04 running on empty
05 telescope
06 that was then
07 when you go
08 silhouettes of you
09 all in my mind
10 hollow crown
11 reverie
Genre: Alternative
Released: 2018/04/13
Copyright: A Virgin EMI Records release; ℗ 2018 Buried Crowns Ltd, under exclusive license to Universal Music Operations Limited
Tracklist:
01 terrified
02 last words
03 the death of you & i
04 running on empty
05 telescope
06 that was then
07 when you go
08 silhouettes of you
09 all in my mind
10 hollow crown
11 reverie
#天文[超话]##天文#
【NASA Feb.10, 2021】为什么星星会闪烁？我们的大气层是罪魁祸首，因为温度稍微偏低的气团不断运动，扭曲了来自遥远天体的光路径。大气湍流对天文学家来说是个问题，因为它模糊了他们想要研究的源图像。这张照片中的望远镜位于欧洲南方天文台的帕瑞纳天文台，它装备了4个激光器来对抗这种湍流。这些激光器被调到一种能够激发地球大气层中高空漂浮的原子的颜色ーー流星划过时留下的钠。这些发光的钠斑点作为人造恒星，其闪烁被立即记录下来并传递到一个灵活的镜面，每秒变形数百次，抵消大气湍流，产生清晰的图像。恒星的消光是一个正在发展的技术领域，在某些情况下，可以从地面拍摄到哈勃级的图像。这项技术也导致了人类视觉科学的衍生应用，在那里它被用来获得非常清晰的视网膜图像。
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Why do stars twinkle? Our atmosphere is to blame as pockets of slightly off-temperature air, in constant motion, distort the light paths from distant astronomical objects. Atmospheric turbulence is a problem for astronomers because it blurs the images of the sources they want to study. The telescope featured in this image, located at ESO’s Paranal Observatory, is equipped with four lasers to combat this turbulence. The lasers are tuned to a color that excites atoms floating high in Earth’s atmosphere — sodium left by passing meteors. These glowing sodium spots act as artificial stars whose twinkling is immediately recorded and passed to a flexible mirror that deforms hundreds of times per second, counteracting atmospheric turbulence and resulting in crisper images. The de-twinkling of stars is a developing field of technology and allows, in some cases, Hubble-class images to be taken from the ground. This technique has also led to spin-off applications in human vision science, where it is used to obtain very sharp images of the retina.
【NASA Feb.10, 2021】为什么星星会闪烁？我们的大气层是罪魁祸首，因为温度稍微偏低的气团不断运动，扭曲了来自遥远天体的光路径。大气湍流对天文学家来说是个问题，因为它模糊了他们想要研究的源图像。这张照片中的望远镜位于欧洲南方天文台的帕瑞纳天文台，它装备了4个激光器来对抗这种湍流。这些激光器被调到一种能够激发地球大气层中高空漂浮的原子的颜色ーー流星划过时留下的钠。这些发光的钠斑点作为人造恒星，其闪烁被立即记录下来并传递到一个灵活的镜面，每秒变形数百次，抵消大气湍流，产生清晰的图像。恒星的消光是一个正在发展的技术领域，在某些情况下，可以从地面拍摄到哈勃级的图像。这项技术也导致了人类视觉科学的衍生应用，在那里它被用来获得非常清晰的视网膜图像。
=============================
Why do stars twinkle? Our atmosphere is to blame as pockets of slightly off-temperature air, in constant motion, distort the light paths from distant astronomical objects. Atmospheric turbulence is a problem for astronomers because it blurs the images of the sources they want to study. The telescope featured in this image, located at ESO’s Paranal Observatory, is equipped with four lasers to combat this turbulence. The lasers are tuned to a color that excites atoms floating high in Earth’s atmosphere — sodium left by passing meteors. These glowing sodium spots act as artificial stars whose twinkling is immediately recorded and passed to a flexible mirror that deforms hundreds of times per second, counteracting atmospheric turbulence and resulting in crisper images. The de-twinkling of stars is a developing field of technology and allows, in some cases, Hubble-class images to be taken from the ground. This technique has also led to spin-off applications in human vision science, where it is used to obtain very sharp images of the retina.
观天巨目，国之重器
目前世界上最大的单面射电望远镜中国的FAST（Five-hundred-meter Aperture Spherical radio Telescope），即500米口径球面射电望远镜，是以南仁东为代表的一批科技工作者历时20多年的默默工作、无私奉献建成的，是我国在前沿科学领域的一项重大原创突破。
2019年我怀着对FAST的好奇和对校友南仁东的崇敬，专程到贵州平塘县天文小镇去参观天眼。当我踏过789级台阶爬上观景平台时，只见竖立在大窝凼山洼里、30个足球场大的"大锅”，四周被郁郁葱葱的青山所怀抱，“大锅”由安装在6670根主索“编织"成的索网上的4450块反射板组成，利用促动器控制下拉索，实现“大锅”的主动调姿。30吨重的馈源舱由四周的6个高塔的六根钢索牽引，悬在离"锅底"约80米的高空。工程的宏大和难度给我留下了深刻印象。回来时买了个天眼的钥匙链，留作永久的纪念。
目前世界上最大的单面射电望远镜中国的FAST（Five-hundred-meter Aperture Spherical radio Telescope），即500米口径球面射电望远镜，是以南仁东为代表的一批科技工作者历时20多年的默默工作、无私奉献建成的，是我国在前沿科学领域的一项重大原创突破。
2019年我怀着对FAST的好奇和对校友南仁东的崇敬，专程到贵州平塘县天文小镇去参观天眼。当我踏过789级台阶爬上观景平台时，只见竖立在大窝凼山洼里、30个足球场大的"大锅”，四周被郁郁葱葱的青山所怀抱，“大锅”由安装在6670根主索“编织"成的索网上的4450块反射板组成，利用促动器控制下拉索，实现“大锅”的主动调姿。30吨重的馈源舱由四周的6个高塔的六根钢索牽引，悬在离"锅底"约80米的高空。工程的宏大和难度给我留下了深刻印象。回来时买了个天眼的钥匙链，留作永久的纪念。
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