NEOWISE彗星的颀长彗尾

NEOWISE彗星的颀长彗尾

ByNASA中文

2020年7月16日 The Long Tails of Comet NEOWISE Image Credit & Copyright: Petr Horalek Explanation: This Comet NEOWISE (C/2020 F3) now sweeps through our fair planet’s northern skies. Its long tails stretch across this deep skyview from Suchy Vrch, Czech Republic. Recorded on the night of July 13/14, the composite of untracked foreground and tracked and filtered sky exposures teases out details in the comet’s tail not visible to the unaided eye. Faint structures extend to the top of the frame, over 20 degrees from the comet’s bright coma. Pushed out by the pressure of sunlight itself, the broad curve of the comet’s yellowish dust tail is easy to see by eye. But the fainter, more bluish tail is separate from the reflective comet dust. The…

瑞士阿尔卑斯山上空的NEOWISE彗星

瑞士阿尔卑斯山上空的NEOWISE彗星

ByNASA中文

2020年7月15日 Comet NEOWISE over the Swiss Alps Image Credit & Copyright: Philipp Salzgeber, foto-webcam.eu; Text: Adam Block Explanation: Comet NEOWISE has been wowing photographers around much of the world during dawn and dusk, at the margins of day and night. For the most northern residents of planet Earth, however, the comet circles the North Star and never sets. The night part of this circular arc is apparent in the featured composite of images assembled from a webcam located at a ski resort in the Swiss Alps. Images were selected at 30-minute intervals throughout the night from July 12th -13th. Comet NEOWISE (C/2020 F3) will continue to become more accessible to northern hemisphere observers as its motion places it higher in the sky each evening after…

巨石阵上空的NEOWISE彗星

巨石阵上空的NEOWISE彗星

ByNASA中文

2020年7月14日 Comet NEOWISE over Stonehenge Image Credit & Copyright: Declan Deval Explanation: Have you ever seen a comet? Tonight — and likely the next few nights — should be a good chance. Go outside just at sunset and look to your northwest. The lower your horizon, the better. Binoculars may help, but if your sky is cloudless and dark, all you should need is your unaided eyes and patience. As the Sun sets, the sky will darken, and there will be an unusual faint streak pointing diagonally near the horizon. That is Comet NEOWISE. It is a 5-kilometer-wide evaporating dirty iceberg visiting from — and returning to — the outer Solar System. As the Earth turns, the comet will soon set, so you might want…

亚得里亚海上空的NEOWISE彗星

亚得里亚海上空的NEOWISE彗星

ByNASA中文

2020年7月13日 Comet NEOWISE Rising over the Adriatic Sea Video Credit & Copyright: Paolo Girotti Explanation: This sight was worth getting out of bed early. Comet C/2020 F3 (NEOWISE) has been rising before dawn during the past week to the delight of northern sky enthusiasts awake that early. Up before sunrise, the featured photographer was able to capture in dramatic fashion one of the few comets visible to the unaided eye this century, an inner-Solar System intruder that might become known as the Great Comet of 2020. The resulting video details Comet NEOWISE from Italy rising over the Adriatic Sea. The time-lapse video combines over 240 images taken over 30 minutes. The comet is seen rising through a foreground of bright and undulating noctilucent clouds, and…

NEOWISE彗星的彗尾

NEOWISE彗星的彗尾

ByNASA中文

2020年7月11日 The Tails of Comet NEOWISE Image Credit & Copyright: Miloslav Druckmuller (Brno University of Technology) Explanation: Comet NEOWISE (C/2020 F3) is now sweeping through northern skies. Its developing tails stretch some six degrees across this telescopic field of view, recorded from Brno, Czech Republic before daybreak on July 10. Pushed out by the pressure of sunlight itself, the comet’s broad, yellowish dust tail is easiest to see. But the image also captures a fainter, more bluish tail too, separate from the reflective comet dust. The fainter tail is an ion tail, formed as ions from the cometary coma are dragged outward by magnetic fields in the solar wind and fluoresce in the sunlight. In this sharp portrait of our new visitor from the outer…

从国际空间站看NEOWISE彗星

从国际空间站看NEOWISE彗星

ByNASA中文

2020年7月10日 Comet NEOWISE from the ISS Image Credit: NASA, ISS Explanation: Rounding the Sun on July 3rd and currently headed for the outer Solar System, Comet NEOWISE (C/2020 F3) has been growing brighter in the predawn skies of planet Earth. From low Earth orbit it also rises before the Sun, captured above the approaching glow along the eastern horizon in this snapshot from the International Space Station on July 5. Venus, now Earth’s morning star is the brilliant celestial beacon on the right in the field of view. Above Venus you can spot the sister stars of the more compact Pleiades cluster. Earthbound skygazers can spot this comet with the unaided eye, but should look for awesome views with binoculars. Comet NEOWISE from Earth’s Surface:…

夜光云与NEOWISE彗星

夜光云与NEOWISE彗星

ByNASA中文

2020年7月9日 Noctilucent Clouds and Comet NEOWISE Image Credit & Copyright: Emmanuel Paoly Explanation: These silvery blue waves washing over a tree-lined horizon in the eastern French Alps are noctilucent clouds. From high in planet Earth’s mesosphere, they reflect sunlight in this predawn skyscape taken on July 8. This summer, the night-shining clouds are not new to the northern high-latitudes. Comet NEOWISE is though. Also known as C/2020 F3, the comet was discovered in March by the Earth-orbiting Near Earth Object Wide-field Infrared Survey Explorer (NEOWISE) satellite. It’s now emerging in morning twilight only just visible to the unaided eye from a clear location above the northeastern horizon. Tomorrow’s picture: pixels in space 光云与NEOWISE彗星 图像提供与版权：Emmanuel Paoly 说明：这些摄于法国东阿尔卑斯山，看似在冲击有成列绿树的地平线之银蓝波浪，其实是夜光云。在7月8日的清晨天空中，这些云在地球的中气层里反射阳光。而在今年的夏季，夜光云是北半球高纬度地区的常客。不过，刚在今年的3月，由绕行地球的广视野红外巡天卫星（NEOWISE）发现的NEOWISE彗星，则是如假包换的新访客。目前从视野广阔的地点，在东北地平线上方的曙光中，肉眼隐约可见到NEOWISE彗星。 明日的图片：pixels in space

黎巴嫩上空的NEOWISE彗星

黎巴嫩上空的NEOWISE彗星

ByNASA中文

2020年7月7日 Comet NEOWISE over Lebanon Image Credit & Copyright: Maroun Habib (Moophz) Explanation: A comet has suddenly become visible to the unaided eye. Comet C/2020 F3 (NEOWISE) was discovered in late March and brightened as it reached its closest approach to the Sun, inside the orbit of Mercury, late last week. The interplanetary iceberg survived solar heating, so far, and is now becoming closer to the Earth as it starts its long trek back to the outer Solar System. As Comet NEOWISE became one of the few naked-eye comets of the 21st Century, word spread quickly, and the comet has already been photographed behind many famous sites and cities around the globe. Featured, Comet NEOWISE was captured over Lebanon two days ago just before sunrise….