Wow! Astronaut Captures Incredible View of ‘Fireball’ Meteor from Space (Video)

Wow! Astronaut Captures Incredible View of ‘Fireball’ Meteor from Space (Video)

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While filming an incredible view of Earth from space, an astronaut aboard the International Space Station (ISS) inadvertently captured a fireball on camera as it whizzed into the atmosphere off the coast of South Africa, above the Atlantic Ocean.

European Space Agency (ESA) astronaut Paolo Nespoli shot the video on Nov. 5 as the ISS flew from a spot over the southern Atlantic Ocean toward Kazakhstan, orbiting about 250 miles (400 kilometers) above Earth. To spot the meteor in the image, look toward the top-right corner of the video.

With three meteor showers raining down on Earth this month, it’s tough to say exactly which meteor shower this fireball belongs to. It may have come from the Taurid meteor shower, which peaked a few days later, on Nov. 10. It could also be an early Leonid — that meteor shower peaks this weekend, but it has been active all month long. And the Orionid meteor shower peaked in late October, but it will remain active through the end of November. [5 Amazing Fireballs Caught on Video]

A screenshot from Paolo Nespoli's video of a meteoroid shows a fireball zipping through the atmosphere on Nov. 5, 2017. A red circle indicates the location of the fireball.

A screenshot from Paolo Nespoli’s video of a meteoroid shows a fireball zipping through the atmosphere on Nov. 5, 2017. A red circle indicates the location of the fireball.

Credit: ESA/NASA/Space.com

Meteors are pieces of space rock — usually debris from comets or asteroids — that enter Earth’s atmosphere at high speeds. Friction with the atmosphere produces heat that vaporizes the meteors, causing them to light up in the sky like “shooting stars.” Sometimes, the meteors can splatter when they hit the atmosphere, causing a bright flash of light known as a fireball.

“Indeed it looks like a bright meteor, or fireball,” Detlef Koschny, co-manager of the near-Earth object (NEO) segment of ESA’s Space Situational Awareness program, said in a statement. “One can see the fireball illuminating the clouds from above, so it must have been close to them — and close to the Earth’s limb. It also seems to show a little tail.”

Though it certainly looks like a fireball, Koschny said there are other possibilities, such as a re-entering piece of orbiting space debris.

Rüdiger Jehn, another co-manager of ESA’s NEO program, calculated that the object seemed to be moving “much faster than typical,” entering the atmosphere at 40 kilometers per second, or about 89,500 mph. According to Jehn, that’s twice as fast as a typical meteor, “but still in the observable range between 11 and 72 km/s” (approximately 24,600 to 161,000 mph).

Also visible in Nespoli’s time-lapse video are plenty of clouds and thunderstorms, with blue flashes of lightning scattered across the view. A faint, yellow-orange airglow can be seen above the horizon. This faint emission of light comes from sodium atoms in the so-called sodium layer of the atmosphere, which is located 50 to 65 miles (80 to 105 kilometers) above Earth’s surface.

Email Hanneke Weitering at hweitering@space.com or follow her @hannekescience. Follow us @SpacedotcomFacebook and Google+. Original article on Space.com.

火星男孩再提拿破崙東方雄獅甦醒說,是指中國將雄霸世界嗎?

火星男孩再提拿破崙東方雄獅甦醒說,是指中國將雄霸世界嗎?
發佈日期:2016年10月26日, 訂閱 3,100

物理大師霍金認為火星男孩的確不是地球人,因為他說出的事超乎很多科學家想像。火星男孩現已是20歲的火星青年,他又提到拿破崙說過的東方雄獅正在甦醒,並直指就是中國!
火星男孩並指出過去沒人注意的埃及金字塔八千多粒穀子的秘密,原來五千年前埃及法老就知道中國將擔負起人類絕續的重責大任!
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史上最大冰山 快與南極洲分家

史上最大冰山 快與南極洲分家

 2017-07-07 01:50聯合報 編譯王麗娟/報導
南極「拉森C冰架」的裂谷。 (取自網路)
南極「拉森C冰架」的裂谷。 (取自網路)

一塊巨大冰原即將與南極洲分家,這塊名為「拉森C冰架」的冰原,是南極洲第四大冰架,面積六千平方公里,相當於六分之一個台灣。「拉森C冰架」可能在幾天或幾周內脫離南極洲,成為史上最大斷裂脫離的冰山,一旦它解體漂移,可能對船隻構成威脅。「拉森C冰架」是南極洲東北岸大拉森冰架的一部分。美國有線電視新聞網(CNN)報導,根據歐洲太空總署,「拉森C冰架」目前冰裂的長度已延伸到兩百公里,換句話說,它與大拉森冰架的連接僅剩五公里。六月初時,還有十三公里。

里茲大學的安娜.霍格指出:「我們不確定會發生何事,它可能斷成碎片,或整體漂移後才解體。無論是整體或碎片,洋流可能將拖向北方,可能遠至福克蘭群島。果真如此,將對德雷克海峽的船隻造成危險。」

「拉森C冰架」不是第一個斷裂漂移的大冰山。過去卅年,「拉森A」和「拉森B」也脫離了大冰架。有學者認為冰架脫離是自然現象,也有人指出,氣候暖化影響南極,讓冰架加速崩解。

美國太空總署表示,「拉森C冰架」的分裂將帶動惡性循環,導致冰架更加脆弱。原本受到「拉森C冰架」保護的更深層的冰層,預期會變得更易於消融和解體,特別是隨著氣溫升高。而大冰架在失去它的支柱之一後,也將變得較不穩定。

南極太空暖化