保护地球，探索宇宙，发现文明
2023年2月28日 Crescent Moon Beyond Greek Temple Image Credit & Copyright: Elias Chasiotis Explanation: Why is a thin crescent moon never seen far from a horizon? Because the only geometry that gives a thin crescent lunar phase occurs when the Moon appears close to the Sun in the sky. The crescent is not caused by the shadow of the Earth, but by seeing only...
2023年2月27日 Zodiacal Ray with Venus and Jupiter Image Credit & Copyright: Ruslan Merzlyakov (astrorms) Explanation: What’s causing that unusual ray of light extending from the horizon? Dust orbiting the Sun. At certain times of the year, a band of sun-reflecting dust from the inner Solar System appears prominently after sunset or before sunrise and...
2023年2月26日 Saturn’s Iapetus: Moon with a Strange Surface Image Credit: NASA, ESA, JPL, SSI, Cassini Imaging Team Explanation: What would make a moon look like a walnut? A strange ridge that circles Saturn’s moon Iapetus’s equator, visible near the bottom of the featured image, makes it appear similar to a popular edible nut. The origin of t...
The sun rises on a SpaceX Falcon 9 rocket and Dragon spacecraft on Thursday, Feb. 23, 2023, at NASA’s Kennedy Space Center in Florida. The Crew-6 mission is the sixth crew-rotation mission of the SpaceX Crew Dragon spacecraft and Falcon 9 rocket to the International Space Station as part of the agency’s Commercial Crew Program; it is scheduled to launch at 1...
2023年2月25日 Crescent Moon Occultation Image Credit & Copyright: Fefo Bouvier Explanation: On February 22, a young Moon shared the western sky at sunset with bright planets Venus and Jupiter along the ecliptic plane. The beautiful celestial conjunction was visible around planet Earth. But from some locations Jupiter hid for a while, occulted by the cresce...
2023年2月24日 Jones-Emberson 1 Image Credit & Copyright: Serge Brunier, Jean-François Bax, David Vernet, C2PU/OCA Explanation: Planetary nebula Jones-Emberson 1 is the death shroud of a dying Sun-like star. It lies some 1,600 light-years from Earth toward the sharp-eyed constellation Lynx. About 4 light-years across, the expanding remnant of the dying star...
詹姆斯·韦伯太空望远镜的NIRCam仪器拍摄到的球状星团M92的图像。该图像由四种不同滤镜的四次曝光合成而成：F090W（波长0.9微米）以蓝色显示；F150W（波长1.5微米）以青色显示；F277W（波长2.77微米）以黄色显示；F444W（波长4.44微米）以红色显示。中心的黑色条纹是芯片间隙，这是NIRCam的两个长波长检测器分离的结果。这个空隙覆盖了星团密集的中心，它太亮了，无法同时拍摄到星团较暗、较不致密的外围。这张图像的直径约为5弧分（39光年）。从太空望远镜科学研究所的资源库下载M92的全分辨率图像。 影像来源：NASA, ESA, CSA, A. Pagan (STScI). 编者按：本文重点介绍了韦伯科学进展中的数据，这些数据尚未通过同行评审。 2022年6月20日，詹姆斯·韦伯太空望远镜花了...
Astronaut John Glenn enters the Mercury spacecraft, Friendship 7, prior to the launch of Mercury-Atlas 6 (MA-6) on Feb. 20, 1962. The MA-6 mission was the first crewed orbital flight and Glenn became the first American to orbit the Earth during the three-orbit, five-hour MA-6 mission. Image Credit: NASA 1962年2月20日，在水星阿特拉斯6号（MA-6）发射之前，宇航员约翰·格伦进入水星飞船友谊7号。MA-6任...
2023年2月23日 Arp 78: Peculiar Galaxy in Aries Image Credit & Copyright: Josep Drudis Explanation: Peculiar spiral galaxy Arp 78 is found within the boundaries of the head strong constellation Aries. Some 100 million light-years beyond the stars and nebulae of our Milky Way galaxy, the island universe is an enormous 200,000 light-years across. Also known a...
正如我们最新的新闻稿中所讨论的那样，使用NASA钱德拉X射线天文台的一项新研究跟踪了矮星系碰撞过程中的两对超大质量黑洞。这是这种即将发生的碰撞的第一个证据，为科学家提供了关于宇宙早期黑洞生长的重要信息。 根据定义，矮星系包含的恒星的总质量小于30亿个太阳，大约是银河系的20倍。天文学家长期以来一直怀疑，矮星系合并，特别是在相对早期的宇宙中，是为了成长为今天所见的更大的星系。然而，目前的技术无法观测到第一代矮星系合并，因为它们在遥远的距离上非常微弱。另一种策略（寻找更近距离的矮星系合并）迄今尚未成功。 这项新研究克服了这些挑战，对钱德拉X射线观测进行了系统的调查，并将其与NASA广域红外线巡天望远镜（WISE）的红外数据和加拿大-法国-夏威夷望远镜（CFHT）的光学数据进行了比较。 钱德拉在这项研究中特别有价值，...