保护地球，探索宇宙，发现文明
2022年4月6日 Earendel: A Star in the Early Universe Image Credit: NASA, ESA, B. Welch (JHU), D. Coe (STScI); Processing: A. Pagan (STScI) Explanation: Is Earendel the farthest star yet discovered? This scientific possibility started when the Hubble Space Telescope observed a huge cluster of galaxies. The gravitational lens effect of this cluster was seen to mag...
Every winter, a layer of carbon dioxide frost (dry ice) forms on the surface of Mars. At its greatest extent in mid-winter, this frost reaches from the poles down to the middle latitudes, until it is too warm and sunny to persist. In most places this is around 50 degrees latitude, similar to the latitude of southern Canada on Earth. However, small patches of...
NASA’s Space Launch System (SLS) rocket with the Orion spacecraft aboard is seen at sunrise atop a mobile launcher at Launch Complex 39B, Monday, April 4, 2022. From April 1-4, the Artemis I launch team is conducting the wet dress rehearsal test at NASA’s Kennedy Space Center in Florida. Ahead of the Artemis I flight test, the wet dress rehearsal will run th...
2022年4月5日 Seven Sisters versus California Image Credit & Copyright: Neven Krcmarek Explanation: On the upper right, dressed in blue, is the Pleiades. Also known as the Seven Sisters and M45, the Pleiades is one of the brightest and most easily visible open clusters on the sky. The Pleiades contains over 3,000 stars, is about 400 light years away, and on...
2022年4月4日 A Vortex Aurora over Iceland Image Credit & Copyright: Christophe Suarez Explanation: No, the car was not in danger of being vacuumed into space by the big sky vortex. For one reason, the vortex was really an aurora, and since auroras are created by particles striking the Earth from space, they do not create a vacuum. This rapidly developing a...
2022年4月3日 CMB Dipole: Speeding Through the Universe Image Credit: DMR, COBE, NASA, Four-Year Sky Map Explanation: Our Earth is not at rest. The Earth moves around the Sun. The Sun orbits the center of the Milky Way Galaxy. The Milky Way Galaxy orbits in the Local Group of Galaxies. The Local Group falls toward the Virgo Cluster of Galaxies. But these speeds ...
Engineers and technicians are continuing to prepare for the Artemis I wet dress rehearsal test, which is slated to begin on April 1 and conclude on April 3. This close-up view shows the Space Lanch System rocket for Artemis I inside the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida. The wet dress rehearsal will begin at 5 p.m. EDT on ...
4月份的天空会发生什么？行星近合和北斗七星中隐藏的惊喜。
2022年4月2日 Nova Scotia Northern Lights Image Credit & Copyright: Jason Dain Explanation: This almost otherworldly display of northern lights was captured in clear skies during the early hours of March 31 from 44 degrees north latitude, planet Earth. In a five second exposure the scene looks north from Martinique Beach Provincial Park in Nova Scotia, Cana...
这段由NASA毅力号火星车在火星上拍摄的视频中的声音包括用于岩石分析的除尘工具、机智号火星直升机，以及激光对岩石的冲击。对其中一些声音的一项新研究（主要由火星车的SuperCam麦克风在任务的前216天期间捕获）揭示了声音在火星上的不同之处，包括声音比地球上的传播速度慢。 视频来源：NASA/JPL-Caltech 一项基于火星车记录的新研究发现，这颗红色星球上的声速比地球上的要慢，而且大多数情况下，都是一片寂静。 仔细聆听由NASA毅力号记录的来自火星的声音：火星车的机械呜呜声和轻柔的火星风声；火星机智号直升机旋翼的嗡嗡声；激光击碎岩石的噼啪声。 一个国际科学家团队已经完成了这项工作，在这颗红色星球上进行了第一次声学分析。他们的新研究揭示了声音在极薄的、主要是二氧化碳的大气中传播的速度，人类耳朵听到火星声音的...