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英仙座流星雨如约而至 浪漫绽放夜空

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小编摘要:每年8月中旬,都会有一场流星雨如约而至,那就是著名的英仙座流星雨。

导读:北半球三大流星雨之一的英仙座流星雨如期光临地球,浪漫绽放于静谧的夜空。高峰时期,每小时有超过100颗的流星从英仙座的方向投射而来,像一束闪亮的荧光,划破寂静的夜空。流星雨是由彗星分裂的碎片产生,英仙座流星雨母体是斯威夫特·塔特尔彗星,地球穿越斯威夫特·塔特尔彗星瓦解后残留的碎石带密集区,每小时有成百上千的彗星残片袭击地球,其中约百余颗以流星的形式掠过大气层而形成流星雨。由于这些流星从星空的英仙座方向飞来,因此被称为“英仙座流星雨”。

A meteor streaks past stars in the night sky over the village of Kuklici in Macedonia. The village is known for its hundreds of naturally formed stones which resemble human beings

A meteor streaks past stars in the night sky over the village of Kuklici in Macedonia. The village is known for its hundreds of naturally formed stones which resemble human beings

Stargazers across the world watched a stunning light show with sightings of the annual Perseid meteor shower on Friday night.

The Perseids, which come every August, are normally one of the highlights of the celestial year for amateur astronomers.

Under ideal conditions up to 100 of the shooting stars an hour would have been visible when the shower peaked.

The Perseid meteor shower has been observed by skywatchers for at least 2,000 years, according to NASA.

The meteor are named Perseid because they point where they come from - the constellation Perseus.

The Perseids are grains of dust shed from the tail of Comet Swift-Tuttle burning up in the atmosphere.

Every year in August the Earth ploughs through a cloud of the dust as it orbits the sun.Every August, Earth flies through the comet's cloud of debris and the tiny bits of Swift-Tuttle (most of them more than 1,000 years old) burn up in the atmosphere as they streak at nearly 133,200 mph.

At their best, the Perseids usually let you see one or two shooting stars a minute, and pass in a matter of seconds.

According to the website Spaceweather.com, international observers reported up to 20 meteors per hour during the Perseids' peak.

Dr Marek Kukula, public astronomer at the Greenwich Royal Observatory said: 'The Perseids are always an exciting meteor shower to watch out for.'

'Even in large cities it's often possible to catch site of some of the brighter Perseid meteors streaking across the sky, but from a really dark site you can sometimes see dozens per hour.'

'The meteors can appear anywhere in the sky so try looking away from the bright moon to maximise your chances of seeing one.'

NASA hosted a a live web last night with astronomers from the Marshall Space Flight Centre on hand to talk to stargazers, opening up the experience online.

For best viewing, NASA recommends sky watchers look to the darkest parts of the sky.

Viewers in the U.S. were also able to see the International Space Station, visible as a bright star moving steadily across the sky, which passed over North America several times every morning this week and could be seen at different times in almost every part of the country.

Alan MacRobert, a senior editor of Sky & Telescope magazine told ABC News: 'If you want fireworks, go find a video of fireworks on YouTube. This isn't like that.'

'This is about being part of nature and the wider cosmos.'

'Most people never look up. They go about their busy little lives wrapped up in their busy little concerns here on the ground like ants in an anthill.'

'Amateur astronomers - and nature people in general - are people who sometimes stop to look up, and to take the time to find out about what they see.'

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2011-08-15 10:47 编辑:jeannn
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