国际空间站的星轨

国际空间站的星轨

ByNASA中文

Stars leave streaks of light in concentric circles in this March 16, 2012, view from the International Space Station. To create this composite long exposure, NASA astronaut Don Pettit combined multiple 30-second exposures from a mounted camera on the space station into one image. The orbiting laboratory travels 5 miles per second, traveling around our planet every 90 minutes. Image Credit: NASA/Don Pettit 2012年3月16日，从国际空间站拍摄的照片中，恒星在同心圆上留下一道道光。为了制作这张合成的长时间曝光照片，NASA宇航员唐·佩蒂特将空间站上安装的相机拍摄的多张30秒曝光照片合成了一张照片。 轨道实验室每秒飞行5英里，每90分钟绕地球一周。 影像来源：NASA/Don Pettit

路易斯安那州的稻田

路易斯安那州的稻田

ByNASA中文

This Feb 3, 2023, enhanced-color image from Landsat 9 highlights a green and blue patchwork pattern in flooded rice fields in southwestern Louisiana. Raised levees used for water management form the grid pattern between the fields, which appear dark blue. As it flowed through several southern states over tens of thousands of years, the Mississippi River left a valuable layer of fertile soil in its wake. This low-lying floodplain and the flat coastal prairies of Louisiana and Texas are now home to most of the rice farms in the United States. In 2021, Arkansas, Louisiana, Mississippi, and Texas—collectively known as the Rice Belt—produced about 73 percent of all rice in the United States. Image Credit: NASA 这张2023年2月3日的增强彩色图像来自陆地卫星9号，突出显示了路易斯安那州西南部被洪水淹没的稻田中绿蓝相间的图案。用于水管理的加高的堤坝形成了田地之间的网格图案，呈现深蓝色。 数万年来，密西西比河流经美国南部几个州，留下了一层宝贵的沃土。这片低洼的洪泛平原以及路易斯安那州和德克萨斯州平坦的沿海大草原现在是美国大部分水稻农场的所在地。2021年，阿肯色州、路易斯安那州、密西西比州和德克萨斯州（统称为水稻带）的水稻产量约占美国总产量的73%。 影像来源：NASA

银河巨人土卫六和土星

银河巨人土卫六和土星

ByNASA中文

Titan, Saturn’s largest moon, looks quite small in comparison to the giant planet behind it in this natural color view from the Cassini-Huygens spacecraft. This image from Aug. 29, 2012, also shows seasonal changes occurring on Saturn; as spring comes to the northern Saturnian hemisphere, the azure blue seen fades, while winter in the south adds a bluish hue. This phenomenon is likely due to shifts in the intensity of ultraviolet light and the haze it produces. Image Credit: NASA/JPL-Caltech/Space Science Institute 在卡西尼-惠更斯号宇宙飞船拍摄的这张自然色照片中，土星最大的卫星土卫六与身后的巨行星相比显得相当小。这张2012年8月29日拍摄的照片也显示了土星上发生的季节变化；随着土星北半球的春天到来，所见的湛蓝逐渐褪去，而南方的冬天则增添了一抹蓝色。这种现象可能是由于紫外线强度的变化及其产生的雾霾造成的。 影像来源：NASA/JPL-Caltech/Space Science Institute

金星的火山

金星的火山

ByNASA中文

Maat Mons, a volcano on Venus that has shown signs of a recent eruption, is in the black square near the planet’s equator in this annotated, computer-simulated global map of Venus’ surface. Scientists discovered direct geological evidence of recent volcanic activity on Venus by poring over archival radar images taken over 30 years ago by NASA’s Magellan mission. The images revealed a volcanic vent changing shape and increasing significantly in size in less than a year. Learn more about Maat Mons and NASA’s new mission to study Venus from surface to core. Image Credit: NASA/JPL-Caltech 在这张有注释的、计算机模拟的金星表面全球地图中，金星上的马特蒙斯火山位于赤道附近的黑色正方形中，最近有喷发的迹象。 科学家们仔细研究了30多年前NASA麦哲伦任务拍摄的档案雷达图像，发现了金星最近火山活动的直接地质证据。这些图像显示，在不到一年的时间里，一个火山口的形状发生了变化，规模也在显著扩大。 了解更多关于马特蒙斯火山和NASA从表面到核心研究金星的新任务。 图片来源：NASA/JPL-Caltech

太平洋上的日出

太平洋上的日出

ByNASA中文

An orbital sunrise reveals cloud tops above the Pacific Ocean northeast of New Zealand as the International Space Station orbited 260 miles above on Feb. 10, 2023. Astronauts aboard the space station see 16 sunrises and sunsets per day due to their high orbital velocity—17,500 miles per hour. In the more than 20 years that people have been living aboard, the station has circumnavigated Earth tens of thousands of times. Image Credit: NASA 2023年2月10日，国际空间站在新西兰东北部的太平洋上空260英里轨道上运行，轨道上的日出显示出太平洋上空的云顶。由于轨道速度高（每小时17,500英里），空间站上的宇航员每天能看到16次日出和日落。在人们居住在空间站的20多年里，空间站已经环绕地球数万次。 影像来源：NASA

戴安娜·特鲁希略激发学生的好奇心

戴安娜·特鲁希略激发学生的好奇心

ByNASA中文

Elementary school students eagerly raise their hands as Diana Trujillo, technical group supervisor for sequence planning and execution and tactical mission lead for the Mars Perseverance rover, speaks to them on March 13, 2023. Born and raised in Colombia, Trujillo immigrated to the U.S. at the age of 17 to pursue her dream of working for NASA. She has held several roles for NASA and JPL, including Mars Curiosity rover mission lead, deputy project system engineer, and deputy team chief of engineering operations on Curiosity. Trujillo has also been active in sharing the excitement and opportunities of STEM with the public. She co-created and hosted #JuntosPerseveramos, NASA’s first Spanish-language live broadcast of a planetary landing, for Perseverance’s arrival on Mars, which attracted millions of viewers…

Crew-5夜间溅落

Crew-5夜间溅落

ByNASA中文

The SpaceX Dragon Endurance spacecraft is seen as it lands with Crew-5 mission members aboard on Saturday, March 11, 2023. The crew returned in a parachute-assisted splashdown at 9:02 p.m. EST. During the 156.5 days they spent aboard the International Space Station as part of Expedition 68, Crew-5 participated in several spacewalks to prepare the space station for solar arrays and conducted various experiments, including growing plants without soil and studying radiation exposure. Image Credit: NASA/Keegan Barber 2023年3月11日，星期六，SpaceX的耐力号龙飞船与Crew-5任务成员一起着陆。美国东部时间晚上9点02分，机组人员通过降落伞辅助溅落返回。 作为第68次远征的一部分，Crew-5在国际空间站上度过了156.5天，他们参加了几次太空行走，为空间站的太阳能电池阵列做准备，并进行了各种实验，包括在没有土壤的情况下种植植物和研究辐射暴露。 影像来源：NASA/Keegan Barber

一缕阳光

一缕阳光

ByNASA中文

The Moon is seen passing in front of the Sun during a solar eclipse from Ross Lake, Northern Cascades National Park, Washington on Aug. 21, 2017. A total solar eclipse swept across a narrow portion of the contiguous United States from Lincoln Beach, Oregon to Charleston, South Carolina. A partial solar eclipse was visible across the entire North American continent along with parts of South America, Africa, and Europe. This was the first total eclipse to span the U.S. since 1918, and with scientific advancements, presented a perfect opportunity to shed light on phenomena such as solar flares and coronal mass ejections. See when and where in the United States solar eclipses will be visible in 2023 and 2024. Image Credit: NASA/Bill Ingalls 2017年8月21日，在华盛顿州喀斯喀特国家公园北部的罗斯湖发生日食时，月亮从太阳前面经过。一次日全食席卷了美国从俄勒冈州林肯海滩到南卡罗来纳州查尔斯顿的一小部分地区。整个北美大陆以及南美、非洲和欧洲的部分地区都可以看到日偏食。 这是自1918年以来第一次横跨美国的日全食，随着科学的进步，这为阐明太阳耀斑和日冕物质抛射等现象提供了绝佳的机会。…

艾琳·柯林斯，发现号飞行员

艾琳·柯林斯，发现号飞行员

ByNASA中文

Former astronaut Eileen Collins sits at the pilot’s station aboard space shuttle Discovery during a hotfiring procedure on Feb. 2, 1995. Selected by NASA in January 1990, Collins became the first woman pilot of a Space Shuttle and the first woman to command a shuttle mission. Over four missions—STS-63 Discovery, STS-84 Atlantis, STS-93 Columbia, and STS-114 Discovery—she logged over 537 hours in space. Highlights of her missions include the Chandra X-Ray Observatory deployment, scientific experiments, and evaluation of new flight safety procedures. Learn more about women astronauts and their significant accomplishments to spaceflight. Image Credit: NASA 1995年2月2日，发现号航天飞机点火过程中，前宇航员艾琳·柯林斯坐在飞行员位置上。 1990年1月，柯林斯被nasa选中，成为第一位航天飞机女飞行员和第一位指挥航天飞机任务的女性。在四次任务中（STS-63发现号、STS-84亚特兰蒂斯号、STS-93哥伦比亚号和STS-114发现号），她在太空中飞行了537个小时。她的任务重点包括钱德拉X射线天文台的部署、科学实验和新飞行安全程序的评估。 了解更多关于女性宇航员和她们对航天事业的重大成就。 影像来源：NASA

哑铃星云发出光秀

哑铃星云发出光秀

ByNASA中文

Infrared light surges out from the Dumbbell Nebula, also known as Messier 27, in this Aug. 10, 2011, image from NASA’s Spitzer Space Telescope. This nebula was discovered in 1764 by Charles Messier. It was the first in a class of objects, now known as planetary nebulae, to make it into Messier’s catalog of astronomical objects. Planetary nebulae, historically named for their resemblance to gas-giant planets, are now known to be the remains of stars that once looked a lot like our Sun. Image Credit: NASA/JPL-Caltech/Harvard-Smithsonian CfA 2011年8月10日，NASA斯皮策太空望远镜拍摄的这张照片中显示了哑铃状星云（也被称为梅西耶27）发出的红外光。这个星云是查尔斯·梅西耶于1764年发现。这是目前被称为行星状星云的一类天体中第一个将其纳入星云星团表的天体。行星状星云，历史上因其与气态巨行星相似而得名，现在被认为是曾经看起来非常像我们太阳的恒星的残骸。 影像来源：NASA/JPL-Caltech/Harvard-Smithsonian CfA