保护地球，探索宇宙，发现文明
2023年2月13日 Comet ZTF and Mars Image Credit & Copyright: Donato Lioce Explanation: No, Comet ZTF is not going to hit Mars. Nicknamed the Green Comet for its bright green coma, C/2022 E3 (ZTF) did, however, pass almost in front of the much-more distant planet a few days ago, very near in time to when the featured picture was taken. The two sky icons were ...
2023年2月12日 Mammatus Clouds over Nebraska Image Credit & Copyright: Jorn Olsen Photography Explanation: When do cloud bottoms appear like bubbles? Normally, cloud bottoms are flat. This is because moist warm air that rises and cools will condense into water droplets at a specific temperature, which usually corresponds to a very specific height. As water ...
An American bald eagle occupies a nest near Kennedy Parkway North at NASA’s Kennedy Space Center on Feb. 8, 2023. Each year, eagles take up winter residence at the Florida spaceport, breeding and raising a new generation. The center shares a boundary with the Merritt Island National Wildlife Refuge, home to more than 1,500 species of plants and animals, and ...
2023年2月11日 Magellanic Clouds over Chile Image Credit & Copyright: Felipe Mac Auliffe López Explanation: The two prominent clouds in this Chilean Atacama Desert skyscape captured on January 21 actually lie beyond our Milky Way galaxy. Known as the Large and the Small Magellanic Clouds they are so named for the 16th century Portuguese explorer Ferdinand M...
2023年2月10日 ZTF meets ATLAS Image Credit & Copyright: Stefan Bemmerl Explanation: Fading as it races across planet Earth’s northern skies comet C/2022 E3 (ZTF) shares this telescopic frame with comet C/2022 U2 (ATLAS). Captured on the night of February 6 from a garden observatory in Germany’s Bavarian Forest, the starry field of view toward t...
2023年2月9日 Nacreous Clouds over Lapland Image Credit & Copyright: Dennis Lehtonen Explanation: Vivid and lustrous, wafting iridescent waves of color wash across this skyscape from Kilpisjärvi, Finland. Known as nacreous clouds or mother-of-pearl clouds, they are rare. But their unforgettable appearance was captured looking south at 69 degrees north latit...
2022年12月16日，即任务的第3,684个火星日，NASA的好奇号使用其Mastcam拍摄了“标记带谷”的360度全景。在这一地区发现的波纹状岩石纹理是火星车所见过的火星古代水和波浪的最清晰证据。 影像来源：NASA/JPL-Caltech/MSSS 在火星车的其他发现中，波纹状的岩石结构表明，在科学家们预计会更干燥的古代火星区域存在湖泊。 去年秋天，当NASA的好奇号火星车抵达“含硫酸盐单元”时，科学家们认为他们看到了湖泊曾经覆盖火星这一地区的最后证据。这是因为这里的岩层形成于比任务早期探索的地区更干燥的环境中。该地区的硫酸盐（含盐矿物质）被认为是在水干涸成细流时所留下的。 因此，好奇号团队惊讶地发现了该任务迄今为止最清楚的证据，证明湖泊中形成了古代水波纹。数十亿年前，浅湖表面的波浪搅动了湖底的沉积物，随...
Japan Aerospace Exploration Agency astronaut Koichi Wakata is pictured in his Extravehicular Mobility Unit, or spacesuit, during his spacewalk on Feb. 2, 2023. He and NASA astronaut Nicole Mann, who took this photo, installed a modification kit on the International Space Station’s starboard truss structure that will enable the future installation of th...
2023年2月8日 Stellar Wind-Shaped Nebula RCW 58 Image Credit & Copyright: Mike Selby & Mark Hanson; Text: Natalia Lewandowska (SUNY Oswego) Explanation: Imagine traveling to a star about 100 times as massive as our Sun, a million times more luminous, and with 30 times the surface temperature. Such stars exist, and some are known as Wolf Rayet (WR) star...
A snapshot of the Tarantula Nebula (also known as 30 Doradus) is featured in this image from the NASA/ESA Hubble Space Telescope. The Tarantula Nebula is a large star-forming region of ionized hydrogen gas that lies 161,000 light-years from Earth in the Large Magellanic Cloud, and its turbulent clouds of gas and dust appear to swirl between the region’s brig...