6月6日凌晨，陜西西安多位網(wǎng)友拍到“不明飛行物”，視頻畫面顯示，該飛行物有著很長的拖尾，從地平線左側(cè)斜著升空，中間還有小部件二次噴射加速的片段，大約一分鐘后消失在畫面當(dāng)中。

Authorities have confirmed that unidentified flying object (UFO) sightings reported over Xi'an's ancient city walls early Friday were rocket exhaust trails from a satellite launch at 4:45 am Beijing Time.

The clarification came after numerous residents in Xi'an, Shaanxi province, captured videos of the spectacular phenomenon. Footage showed a luminous object with an exceptionally long tail ascending diagonally from the horizon, displaying secondary ejection bursts before vanishing after approximately one minute.

#西安上空現(xiàn)白點(diǎn)狀不明飛行物#登上熱搜，評論區(qū)網(wǎng)友紛紛“整活”：

記者經(jīng)向官方核實(shí)，網(wǎng)傳在西安城墻上空的飛行物，就是6月6日04時45分發(fā)射火箭形成的尾跡。

6日，我國在太原衛(wèi)星發(fā)射中心使用長征六號改運(yùn)載火箭，成功將衛(wèi)星互聯(lián)網(wǎng)低軌04組衛(wèi)星發(fā)射升空，衛(wèi)星順利進(jìn)入預(yù)定軌道，發(fā)射任務(wù)獲得圓滿成功。

The event coincided with China's successful launch of the Long March 6 carrier rocket from Taiyuan Satellite Launch Center, approximately 500 km northeast of Xi'an. The rocket deployed the fourth satellite group for China's low Earth orbit internet constellation into preset orbit.

山西汾陽的天文攝影師吉米（化名）告訴記者，長長拖尾實(shí)際上是火箭云，在天空中形成了“暮光效應(yīng)”。

Astrophotographer "Jimmy" from nearby Fenyang city explained the luminous trail resulted from a "twilight effect" – an optical phenomenon occurring when rocket propellant particles disperse in the upper atmosphere and scatter sunlight. This effect, often visible hundreds of kilometers from launch sites during dawn or dusk, typically displays vivid blue or orange hues.

相關(guān)資料顯示，“暮光效應(yīng)”是指導(dǎo)彈或火箭發(fā)射時，尾氣顆粒物在高空大氣中凝結(jié)擴(kuò)散，因陽光散射形成壯觀光學(xué)現(xiàn)象的科學(xué)術(shù)語。其本質(zhì)是航天器尾跡在特定光照條件下的可視化效應(yīng)，常見于日出前或日落后發(fā)射的航天活動，可呈現(xiàn)藍(lán)色、橙色等多彩形態(tài)，覆蓋范圍可達(dá)數(shù)百公里。

來源：人民日報 陜西網(wǎng)

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