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2017-10-30
2017年10月30日:猎户座流星雨-(Orionid Meteors from Orion)
2017年10月30日:猎户座流星雨-(Orionid Meteors from Orion)--原图下载{mtitle title="猎户座流星雨"/}Image Credit & Copyright: Lu Shupei说明: 流星不停的从猎户座射出来。不过,这是预料中的现象,因为每年的十月是猎户座流星雨的季节。上面这幅上个周末摄于中国.内蒙古的影像,呈现了超过12颗接连出现在乌兰哈达火山上空的流星。这张主题影像里的多重流星痕,都可回溯到猎户腰带左上方,称为辐射点的小片天区。猎户座流星的前身,是哈雷彗星历次回归太阳系内围时,所喷出的沙粒大小碎片。哈雷彗星其实造成了二群已知的流星雨,另一群是在每年五月可见的宝瓶η流星雨。在下个月,坦普─塔托彗星所造成的狮子座流星雨,应该会出现一些很明亮的流星痕。{lamp/}原文:{mtitle title="Orionid Meteors from Orion"/}Image Credit & Copyright: Lu ShupeiExplanation: Meteors have been shooting out from the constellation of Orion. This was expected, as October is the time of year for the Orionids Meteor Shower. Pictured here, over a dozen meteors were caught in successively added exposures last weekend over Wulan Hada volcano in Inner Mongolia, China.The featured image shows multiple meteor streaks that can all be connected to a single small region on the sky called the radiant,here visible just above and to the left of the belt of Orion, The Orionids meteors started as sand sized bits expelled from Comet Halley during one of its trips to the inner Solar System. Comet Halley is actually responsible for two known meteor showers, the other known as the Eta Aquarids and visible every May. Next month, the Leonids Meteor Shower from Comet Tempel-Tuttle should also result in some bright meteor streaks.
2017年10月30日
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2002-01-31
2002年01月31日:极紫外光波段的全天图-(EUVE Sky Map)
2002年01月31日:极紫外光波段的全天图-(EUVE Sky Map)--原图下载{mtitle title="极紫外光波段的全天图"/}Credit: EUVE Project,NASA说明: 比太阳远的恒星和遥远的星系,一般认为在极紫外光波段是看不到的,至少在发现星际的空间到处都是氢气后,这种想法就成为一种根深蒂固的常识,因为氢是极紫外光的绝佳吸收物质。 不过,在天文学家发现星际氢气具有不均匀的分布后,这种概念就饱受质疑,也导致美国太空总署在1992年发射极紫外光探测卫星 (EUVE),去探测全天空的极紫外光巡天图。 上面这张上方是北方的极紫外光全天图,就是根据这艘探测卫星头六个月的数据所建构出来的,假色图中可以看到在极紫外光波段的亮度变化。 由于极紫外光探测卫星是沿着它的轨道方向进行扫描,所以这张影像呈现条状的特徵,除此之外,还可以看到由侦测仪器所造成的十字状影像缺陷,以及没有数据的黑色洞隙。 横过图中心带的多重明亮水平短线,是每个轨道所拍到的月亮所造成的,而在图的中左方,应不难认出我们很熟悉的猎户座腰带星。 极紫外光探测卫星的科学探索任务,在2001年划下句点。在任务期间,它总共侦测到将近一千颗天体,其中有30多个是位在我们的银河系外。 控制人员预测极紫外光探测卫星在发现之旅完成后,将在今天重返地球大气。{lamp/}原文:{mtitle title="EUVE Sky Map"/}Credit: EUVE Project,NASAExplanation: The starsbeyondthe Sun and the distant galaxies should be undetectable at extremeultravioletwavelengths.At least that was the conventional wisdom when it was firstrealized that the space between the stars isfilled with hydrogen,a strong absorber of extreme ultraviolet light.But this idea was seriously questioned as it became apparentthat interstellar hydrogen was patchyin its distribution andthe quest to explorethe extreme ultraviolet sky culminatedin 1992 with the launch ofthe EUVE(Extreme UltraViolet Explorer) spacecraft.An all-sky map,based onthe satellite's first six months of operation, appears aboveshowing brightness variations inthe EUV skyin false color (north is up).EUVE's scanning by orbitgivesthe picture a striped lookwhile other instrument artifacts are seen as crosses anddata gaps are dark.Multiple images of the Mooncombine to form the short, bright dashed lineswandering along the middle of the picture.The belt stars of the familiar constellationOrion arefairly easy to make out left of picture center.EUVE's science operations ceased in 2001 but itultimatelydetected nearly 1,000 celestial objects, including over three dozenoutside our own galaxy.EUVE's voyageofdiscovery is now complete, andthe spacecraftre-entered the Earth's atmosphere yesterdayat approximately 11:15 p.m. EST.
2002年01月31日
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