绿岸上空的猎户座

2022年2月23日

Orion over Green Bank
Image Credit & Copyright: Dave Green

Explanation: What will the huge Green Bank Telescope discover tonight? Pictured, the Robert C. Byrd Green Bank Telescope (GBT) on the lower right is the largest fully-pointable single-dish radio telescope in the world. With a central dish larger than a football field, the GBT is nestled in the hills of West Virginia, USA in a radio quiet zone where the use of cell phones, WiFi emitters, and even microwave ovens are limited. The GBT explores our universe not only during the night — but during the day, too, since the daytime sky is typically dark in radio waves. Taken in late January, the featured image was planned for months to get the setting location of Orion just right. The image is a composite of a foreground shot taken over a kilometer away from the GBT, and a background shot built up of long exposures during the previous night. The deep background image of Orion is fitting because the GBT is famous for, among many discoveries, mapping the unusual magnetic field in the Orion Molecular Cloud Complex.

Tomorrow’s picture: colorful stars

绿岸上空的猎户座
影像提供与版权: Dave Green

说明: 庞大的绿岸望远镜今晚会发现什么？这幅影像右下角的绿岸望远镜（GBT），是目前世界上最大的全指向单碟面射电望远镜。中央碟面比美式足球场大的绿岸望远镜 ，座落在美国西维吉尼亚州的丘陵地带。在它周围的电波宁静区里，使用手机、无线电发报器、甚至连微波炉都高度受限。不管是在白天或黑夜，绿岸望远镜皆能探索宇宙，因为在无线电波段，白画的天空也通常是黝黑的。上面这幅摄于今年1月底的主题影像，经过数个月的规划和等待，直到猎户座来到最佳的西落位置。这幅影像组合自一张摄于离绿堤望远镜1公里之处的前景照片，以及在前一晚拍摄的长曝光背景照片。以猎户座的深空照片作为背景算是相当妥贴 ，因为让绿堤望远镜声名大噪的诸多发现之中，就包括绘制猎户分子云复合体内的不寻常磁场。 （Robert C. Byrd Green Bank Telescope, Green Bank Telescope, GBT 绿岸望远镜； Barnard’s Loop 巴纳德环； Betelgeuse 参宿四； Bellatrix 参宿五； Lambda Orionis 觜宿一星云； Orion’s Belt 猎户腰带； Orion Nebula 猎户星云）

明日的图片: colorful stars

[词汇学习]
中文丨Chinese Pinyin丨English

• 单盘

Dān pán丨single-dish

• 射电望远镜

shèdiàn wàngyuǎnjìng丨radio telescope

• 猎户座

lièhùzuò丨Orion

• 分子云复合体

fēnzǐ yún fùhé tǐ丨Molecular Cloud Complex

• 磁场

cíchǎng丨magnetic field