保护地球，探索宇宙，发现文明
2019 November 30 Star Trails for a Red Planet Image Credit & Copyright: Dengyi Huang Explanation: Does Mars have a north star? In long exposures of Earth’s night sky, star trails make concentric arcs around the north celestial pole, the direction of our fair planet’s axis of rotation. Bright star Polaris is presently the Earth’s North ...
2019 November 29 Galileo’s Europa Remastered Image Credit: NASA, JPL-Caltech, SETI Institute, Cynthia Phillips, Marty Valenti Explanation: Looping through the Jovian system in the late 1990s, the Galileo spacecraft recorded stunning views of Europa and uncovered evidence that the moon’s icy surface likely hides a deep, global ocean. Galileo’...
Jason-CS/Sentinel-6任务将追踪海平面上升，这将是未来10年全球变暖最明显的迹象之一。该任务由两颗卫星组成，上图中是第一颗卫星Sentinel-6A正在位于德国的洁净室里进行展示，该卫星计划于2020年11月发射。 版权：德国工业设备管理公司（IABG） 地球上的气候正在发生改变，而关于海洋的研究对于理解气候变化对未来的影响至关重要。美国和欧洲正准备发射Sentinel-6/Jason-CS卫星，以继续研究全球变暖最明显的迹象 – 海平面上升。该卫星将在轨道上运行10年，将是持续时间最长的任务。Sentinel-6/Jason-CS任务（Jason-Continuity of Service的简称）旨在回答这样一个问题：截至2030年，地球上的海平面将上升多少？ 截至2030年，包括...
Thanksgiving 2019 Aboard the Space Station Right now, half of the crew members on board the International Space Station are American astronauts who are getting ready to celebrate Thanksgiving, and they have a message for us. View the video to see what the holiday means to NASA’s Christina Koch, Jessica Meir and Andrew Morgan and get a look at what Thanksgivi...
2019 November 28 Moon and Planets at Twilight Image Credit & Copyright: Petr Horálek Explanation: This week’s ongoing conjunction of Venus and Jupiter may have whetted your appetite for skygazing. Tonight is the main course though. On November 28, a young crescent Moon will join them posing next to the two bright planets above the western horizon a...
由美国宇航局火星勘测轨道飞行器(MRO)上搭载的火星彩色成像仪(MARCI)照相机，并排显示了2018年全球性沙尘暴是如何笼罩这颗红色星球的。这场全球性的沙尘暴导致美国宇航局的“机遇号”探测器与地球失去了联系。 来源：NASA/JPL-Caltech/MSSS 沙尘暴在火星上很常见。但每隔十年左右，就会发生一些不可预测的事情:一系列失控的风暴爆发，将整个火星笼罩在尘土的阴霾之中。 去年，美国国家航空航天局(NASA)的一组航天器详细观察了2018年全球性沙尘暴的生命周期，这场沙尘暴结束了“机遇号”的任务。尽管科学家们仍对这些数据感到困惑，但最近有两篇论文为风暴中观察到的现象提供了新的启示：沙尘塔，即在阳光下变暖并上升到空中的密集沙尘云。科学家们认为，被灰尘困住的水蒸气可能会像电梯一样把它们带到太空，在那里太阳辐...
First and only Native American NASA astronaut, John Herrington (member of the Chickasaw Nation), is pictured here with Lucasti and Caibiya Tsabetsaye (young members of the Zuni Pueblo) in front of the NASA Artemis banner at the 2019 American Indian Science and Engineering Society’s (AISES) National Conference. View the Native American Heritage Month Gallery ...
2019 November 27 Hoag’s Object: A Nearly Perfect Ring Galaxy Image Credit: NASA, ESA, Hubble; Processing: Benoit Blanco Explanation: Is this one galaxy or two? This question came to light in 1950 when astronomer Arthur Hoag chanced upon this unusual extragalactic object. On the outside is a ring dominated by bright blue stars, while near the center lie...
NASA astronaut Andrew Morgan is seen here tethered to the Starboard-3 truss segment work site during the second spacewalk to repair the International Space Station’s cosmic particle detector, the Alpha Magnetic Spectrometer. During the 6.5 hour spacewalk, Morgan and Station Commander Luca Parmitano of the European Space Agency the two successfully cut ...
2019 November 26 Venus and Jupiter on the Horizon Image Credit & Copyright: Juan Carlos Casado (TWAN) Explanation: What are those two bright objects on the horizon? Venus and Jupiter. The two brightest planets in the night sky passed very close together — angularly — just two days ago. In real space, they were just about as far apart as usual...