保护地球，探索宇宙，发现文明
利用NASA的凌日系外行星勘测卫星（TESS）的数据，科学家们已经确定了一个地球大小的世界，称为TOI 700 e，在其恒星的宜居带内运行——这是一个行星表面可能出现液态水的距离范围。这颗行星的大小是地球的95%，而且很可能布满岩石。 天文学家此前在这个星系中发现了三颗行星，分别是TOI 700 b、c和d。行星d也在宜居带内运行。但是科学家们需要额外一年的TESS观测来发现TOI 700e。 “这是我们所知的仅有的几个拥有多颗小型宜居带行星的系统之一。”NASA位于南加州的喷气推进实验室的博士后艾米莉·吉尔伯特说。“这使得TOI 700系统成为一个令人兴奋的后续系统。e行星比d行星小10%左右，所以该系统还显示了额外的TESS观测如何帮助我们发现越来越小的世界。” 吉尔伯特代表她的团队在西雅图举行的美国天文学...
2023年1月10日 NGC 2264: The Cone Nebula Image Credit & Copyright: Matthew Dieterich Explanation: Stars are forming in the gigantic dust pillar called the Cone Nebula. Cones, pillars, and majestic flowing shapes abound in stellar nurseries where clouds of gas and dust are sculpted by energetic winds from newborn stars. The Cone Nebula, a well-known example,...
The scattered stars of the globular cluster NGC 6355 are strewn across this image from the NASA/ESA Hubble Space Telescope. NGC 6355 is a galactic globular cluster that resides in our Milky Way galaxy’s inner regions. It is less than 50,000 light-years from Earth in the constellation Ophiuchus. Globular clusters are stable, tightly bound groups of tens...
NASA的詹姆斯·韦伯太空望远镜拍摄的遥远星系的一项新分析显示，它们非常年轻，与“绿豌豆”有一些显著的相似之处，“绿豌豆”是我们宇宙后院中罕见的一类小星系。 “通过这些早期星系的详细化学指纹，我们发现它们可能是迄今为止发现的最原始的星系。同时，我们可以将这些来自宇宙诞生之初的星系与附近的类似星系联系起来，我们可以对其进行更详细的研究。”马里兰州格林贝尔特NASA戈达德太空飞行中心的天体物理学家詹姆斯·罗兹说。他在西雅图举行的美国天文学会第241次会议上介绍了这一发现。 由罗兹领导的一篇描述这一结果的论文发表在1月3日的《天体物理学杂志快报》上。 在詹姆斯·韦伯太空望远镜拍摄的星系团SMACS 0723的深空图像中，三个微弱的物体（已圈出）表现出与地球附近被称为“绿豌豆”的罕见小星系非常相似的特性。星系团的质量使...
2023年1月9日 Tails of Comet ZTF Image Credit & Copyright: Jose Francisco Hernández Explanation: Comet ZTF may become visible to the unaided eye. Discovered early last year, this massive snowball has been brightening as it approaches the Sun and the Earth. C/2022 E3 (ZTF) will be closest to the Sun later this week, at which time it may become visible even w...
The Surface Water and Ocean Topography (SWOT) spacecraft is seen in this early morning photo from Dec. 14, 2022, as preparations for launch continued. SWOT, the first satellite mission that will observe nearly all water on Earth’s surface, launched on Dec. 16. Jointly developed by NASA and Centre National D’Études Spatiales, with contributions from the Canad...
2023年1月8日 Where Your Elements Came From Image Credit & License: Wikipedia: Cmglee; Data: Jennifer Johnson (OSU) Explanation: The hydrogen in your body, present in every molecule of water, came from the Big Bang. There are no other appreciable sources of hydrogen in the universe. The carbon in your body was made by nuclear fusion in the interior of stars...
2023年1月7日 Space Stations in Low Earth Orbit Image Credit & Copyright: Zarcos Palma Explanation: On January 3, two space stations already illuminated by sunlight in low Earth orbit crossed this dark predawn sky. Moving west to east (left to right) across the composited timelapse image China’s Tiangong Space Station traced the upper trail captured m...
2023年1月6日 Moon O’Clock 2022 Image Credit & Copyright: Niveth Kumar Explanation: The first Full Moon of 2023 is in the sky tonight opposite the Sun at 23:08 UTC. Big and beautiful, the Moon at its brightest phase should be easy to spot. Still, for quick reference images captured near the times of all the full moons of 2022 are aranged in this dedic...
On April 8, 2022, this 30-second exposure captured the International Space Station as it passed over the Space Launch System rocket and the Orion spacecraft at NASA’s Kennedy Space Center in Florida. This photo was chosen by the NASA Headquarters photographers as one of the best images from 2022. See the rest on Flickr. Image Credit: NASA/Joel Kowsky 2022年4月...