我國(guó)首個(gè)目標(biāo)飛行器天宮一號(hào)將再入大氣層燒毀。

據(jù)中國(guó)載人航天工程辦公室介紹，截至3月25日，天宮一號(hào)目標(biāo)飛行器運(yùn)行在平均高度約216.2公里的軌道上（近地點(diǎn)高度208.1公里、遠(yuǎn)地點(diǎn)高度224.3公里），整器結(jié)構(gòu)完整，即將再入大氣層燒毀。

天宮一號(hào)于2011年9月29日發(fā)射升空，先后與神舟八號(hào)、九號(hào)、十號(hào)飛船進(jìn)行6次交會(huì)對(duì)接，完成了各項(xiàng)既定任務(wù)，為中國(guó)載人航天發(fā)展作出了重大貢獻(xiàn)。2016年3月16日，天宮一號(hào)正式終止數(shù)據(jù)服務(wù)，全面完成了歷史使命，進(jìn)入軌道衰減期。

關(guān)于天宮一號(hào)的“謝幕”，這幾個(gè)問題的答案是你可能想知道的：

An artist's impression of China's first-ever space docking between Tiangong I space lab and Shenzhou VIII spacecraft in 2011. [Photo/VCG]

The current best prediction is 1 April (no, this is not an April Fool’s joke).
目前最有力的預(yù)測(cè)是4月1日（這可不是愚人節(jié)玩笑）。

But again, because of its speed, it could be at least a day either side of that.
但是，因?yàn)樘鞂m一號(hào)在燒毀時(shí)處于高速運(yùn)轉(zhuǎn)中，也可能是4月1日的前后兩天。

天宮一號(hào)的殘片最可能落在哪里？

The Aerospace Corporation, a nonprofit organization in the United States, estimated that the re-entry of Tiangong I would occur over Spain, France or Portugal, though an exact location is still hard to pinpoint.
美國(guó)非營(yíng)利組織航空航天公司估計(jì)天宮一號(hào)可能在西班牙、法國(guó)或葡萄牙境內(nèi)墜落，但是具體的地點(diǎn)難以確定。

我們會(huì)不會(huì)被殘片砸中？

No. The chances of being hit by part of the space station are basically zero.
沒必要。被天宮一號(hào)的殘片擊中的可能性幾乎為零。

In terms of size, Tiangong-1 is only the 50th largest spacecraft to come down, and there have been no recorded deaths or injuries from people being struck by debris from any of them.
在燒毀的航天器里面，天宮一號(hào)的體積僅排在第50位，而此前沒有任何記錄顯示有人被燒毀的航天器碎片擊中并導(dǎo)致傷亡。

However, a highly toxic and corrosive substance called hydrazine, which is often used in creating potent rocket fuel, can potentially survive re-entry.
然而，墜落過程中可能有一種名為聯(lián)氨的劇毒腐蝕性物質(zhì)會(huì)殘留在碎片上，這種物質(zhì)常被用來制造火箭推進(jìn)劑。

"For your safety, do not touch any debris you may find on the ground or inhale vapors it may emit," an online statement released by the space agency said.
國(guó)家航天局發(fā)布的網(wǎng)上公告稱：“為了安全起見，請(qǐng)不要觸碰地上的航天器碎片，也不要吸入碎片散發(fā)的氣體?！?/p>

天宮一號(hào)在太空都做了些啥？

It was launched unmanned but was designed to be habitable, to test docking with other craft, and to be used for conducting experiments.
天宮一號(hào)發(fā)射的時(shí)候沒有載人，但是設(shè)計(jì)初衷是可載人的，用來測(cè)試與其他飛船對(duì)接并進(jìn)行一系列實(shí)驗(yàn)。

Tiangong I had completed six space rendezvous and docking missions with three visiting spacecraft. The first visit was by an unmanned spacecraft called Shenzhou VIII in November 2011, as part of China's first space docking mission.
天宮一號(hào)已經(jīng)完成了6次空間交會(huì)，并和3艘飛船實(shí)現(xiàn)了對(duì)接。第一次對(duì)接是在2011年11月與神舟八號(hào)無(wú)人飛船對(duì)接，這也是中國(guó)首次太空對(duì)接任務(wù)的一部分。

The second and third missions were both manned: Shenzhou IX in June 2012 and Shenzhou X in June 2013. Both manned missions had three astronauts and lasted about two weeks, during which the astronauts tested the station's various systems and living conditions.
第二次和第三次對(duì)接任務(wù)都是載人交會(huì)對(duì)接任務(wù)，分別是在2012年6月與神舟九號(hào)對(duì)接，以及在2013年6月與神舟十號(hào)對(duì)接。兩次載人航天任務(wù)都有三名宇航員，時(shí)間持續(xù)約兩周，在這期間航天員測(cè)試了空間站的各個(gè)系統(tǒng)和生存條件。

天宮一號(hào)歷史畫面回顧：

2011年9月29日，我國(guó)首個(gè)目標(biāo)飛行器天宮一號(hào)在酒泉衛(wèi)星發(fā)射中心發(fā)射升空，進(jìn)入預(yù)定軌道。

天宮一號(hào)與神舟八號(hào)飛船成功實(shí)現(xiàn)我國(guó)首次無(wú)人交會(huì)對(duì)接

天宮一號(hào)與神舟九號(hào)飛船實(shí)現(xiàn)我國(guó)首次載人交會(huì)對(duì)接，航天員景海鵬、劉旺、劉洋進(jìn)入天宮一號(hào)。

英文來源：中國(guó)日?qǐng)?bào)、衛(wèi)報(bào)
翻譯&編輯：丹妮