Perhaps the riskiest part of space flight happens at the very end.

许太空飞行中最危险的部分会发生最后。

Many astronauts have complained of eye and back problems after coming back down to Earth and its gravity, and now scientists say they've discovered some new risks with long term space flight.

许多宇航员返回地球重力环境后反应了眼睛和背部出现的问题，现科家们说他们发现了一些长期太空飞行的新风险。

Kelly's a veteran of four space flights, totaling 520 days in space and traveling more than 200 million miles, more than twice the distance from the earth to the sun.

凯利是参加过4次航天飞行任务的老把式，太空长达520天，飞行距离超过2亿英里，比地球到太阳距离的两倍还多。

Those who spend months on the International Space Station regularly exercise to help prevent this loss, but this kind of training might not be possible during long term space flight.

那些要国空间站度过数的人会有规律地锻炼以防止肌肉消失，但这种训练可能对长期进行宇宙飞行的人没有效果。

Yang, who was a pilot in the army, was chosen from 1,500 other army pilots and started training for his space flight in 1998.

军务飞行员杨是从1500名军队飞行员中选拔出来的，并1998年为太空飞行开始训练。

" Celebrities do it for amusement but get a lot more attention than the regular astronauts." The space flight also generated a range of response on social media, from enthusiasm to hostility.

“名人这么做是为了好玩， 但却比普通宇航员获得了更多的关注。 ” 这次太空飞行交媒体上引发了各种反应，从热情支持到敌意都有。

Of course, astronauts must also prepare for their part of the space flight's mission.

然，宇航员还要为他们的太空飞行任务做准备。

We are making the next generation of human space flight possible every day.

我们正让下一代载人航空变得可能。

It's called Starlink it's being launched by the space flight company SpaceX, and it could add between 12,000 and 30,000 satellites to low earth orbit.

它被称为Starlink，由太空飞行公司SpaceX发射，用以近地轨道上增加1.2万到3万颗卫星。

This is all part of a multi-billion dollar contract SpaceX has with NASA to regularly run such missions, ushering in a new era of space flight.

这是SpaceX与NASA签订的数十亿美元合同的一部分，该合同将定期执行此类任务，开创太空飞行的新时代。

The group, based in Washington D.C., supports the development of the space flight industry.

该组织总部位于华盛顿特区，致力于支持航天飞行工业的发展。

That could start with more reusable spacecraft and the space flight company SpaceX is trying to get its reusable's Starship rocket off the ground.

这可以从使用更多可重复使用的航天器开始，太空飞行公司SpaceX正试图发射其可重复使用的星舰（Starship）火箭。

Possibly one of the most iconic photographs in the history of human space flight.

可能是最人类太空飞行史上的标志性照片。

And now scientists say they've discovered some new risks with long term space flight.

现科家表示，他们发现长时间太空飞行还存其他风险。

Cost, however, remains an important issue for space flight.

然而，成本仍然是太空飞行的一个重要问题。

At the Discovery Science Center explore the inner workings of Dinosaurs and space flight.

发现科中心 (Discovery Science Center)探索恐龙和太空船的内部结构吧。

But Jing has done this before — it is his third space flight.

而景海鹏之前有过航天经历，此次是他第三次进行太空飞行。

I think it has applications for unmanned space flight.

我觉得它足以应用无人" 驾" 驶太空飞行上。

The flight has been hailed as a milestone in the commercialization of space flight.

这次飞行被誉为太空飞行商业化的里程碑。

The Dragon freedom spacecraft crew is led by former NASA astronaut Peggy Whitson who's now the first woman to command a private space flight.

“龙”号自由飞船的机组人员由前美国国家航空航天局宇航员佩吉·惠特森领导，她现是第一位指挥私人太空飞行的女性。