哈雷彗星尘埃，火星尘埃和银河系
(原标题: Halley Dust, Mars Dust, and Milky Way)
2023-05-12
浏览次数: 17
五月初，宇宙尘埃颗粒划过夜空。当地球穿过周期性的哈雷彗星留下的碎片流时，一年一度的流星雨被称为埃塔水瓶座流星雨。今年，埃塔宝瓶座的高峰在视觉上受到了五月明亮的满月的阻碍。但在去年5月哈雷彗星的清晨时分，没有月光的干扰。在2022年4月28日至5月8日之间拍摄的照片中，这张合成图像显示了智利圣佩德罗德阿塔卡马上空水瓶座的流星雨辐射中有近90颗埃塔水瓶座流星。在南半球黎明前的天空中，银河系的中央呈弧形。从地平线升起的微弱光带是黄道光，是由太阳系黄道面附近的尘埃散射阳光引起的。沿着黄道和黄道带的是明亮的行星金星、木星、火星和土星。当然，火星本身最近也被发现可能是黄道上产生黄道光的尘埃的来源。
查看原文解释
Grains of cosmic dust streaked through night skies in early May. Swept up as planet Earth plowed through the debris streams left behind by periodic Comet Halley, the annual meteor shower is known as the Eta Aquarids. This year, the Eta Aquarids peak was visually hampered by May's bright Full Moon, though. But early morning hours surrounding last May's shower of Halley dust were free of moonlight interference. In exposures recorded between April 28 and May 8 in 2022, this composited image shows nearly 90 Eta Aquarid meteors streaking from the shower's radiant in Aquarius over San Pedro de Atacama, Chile. The central Milky Way arcs above in the southern hemisphere's predawn skies. The faint band of light rising from the horizon is Zodiacal light, caused by dust scattering sunlight near our Solar System's ecliptic plane. Along the ecliptic and entrained in the Zodiacal glow are the bright planets Venus, Jupiter, Mars, and Saturn. Of course Mars itself has recently been found to be a likely source of the dust along the ecliptic responsible for creating Zodiacal light.
© Petr Horalek