6月6日凌晨，陕西西安多位网友拍到“不明飞行物”，视频画面显示，该飞行物有着很长的拖尾，从地平线左侧斜着升空，中间还有小部件二次喷射加速的片段，大约一分钟后消失在画面当中。

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.



#西安上空现白点状不明飞行物#登上热搜，评论区网友纷纷“整活”：



记者经向官方核实，网传在西安城墙上空的飞行物，就是6月6日04时45分发射火箭形成的尾迹。

6日，我国在太原卫星发射中心使用长征六号改运载火箭，成功将卫星互联网低轨04组卫星发射升空，卫星顺利进入预定轨道，发射任务获得圆满成功。

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.

山西汾阳的天文摄影师吉米（化名）告诉记者，长长拖尾实际上是火箭云，在天空中形成了“暮光效应”。

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.

相关资料显示，“暮光效应”是指导弹或火箭发射时，尾气颗粒物在高空大气中凝结扩散，因阳光散射形成壮观光学现象的科学术语。其本质是航天器尾迹在特定光照条件下的可视化效应，常见于日出前或日落后发射的航天活动，可呈现蓝色、橙色等多彩形态，覆盖范围可达数百公里。

来源：人民日报 陕西网