经过一周的推迟，SpaceX将在今晚从佛罗里达州卡纳维拉尔角发射后，尝试其著名的“猎鹰9号”火箭着陆。火箭的目标又是一艘在海上的无人驾驶飞船，但SpaceX公司对这一次飞船能坚持着陆的希望并不高。发射时间定于美国东部时间今天下午6:35；着陆尝试将在起飞后不久进行。

这颗卫星是史上发射的最重的SpaceX之一

这项任务的目标是将一颗通信卫星送入一个非常高的轨道，供全球卫星舰队运营商SES使用。这颗名为SES-9的卫星将“在东北亚、南亚和印度尼西亚提供DTH广播和其他通信服务，并为印度洋的船只提供海上通信，”SES说。据Spaceflight Now的数据，这颗卫星是史上发射的最重的SpaceX之一，重量超过11000磅。

一旦“猎鹰9号”交付SES-9，SpaceX将再次尝试在海上无人驾驶飞船上降落火箭的第一级。去年12月，该公司成功地将一枚火箭降落在卡纳维拉尔角的一个地面设施上，但未能将“猎鹰9号”的第一级完整地降落在自主海洋平台上。SpaceX也不指望这次能成功着陆；“猎鹰9号”需要额外的燃料将这颗重型卫星送入太空，只剩下很少的燃料用于返回地球。

发射原定于2月24日星期四进行，但推迟到2月28日星期天。火箭的发射窗口于美国东部时间周日下午6:46开始，但由于一艘任性的船而被搁置。不久后的第二次尝试看到了飞船的引擎启动，但当它们发射时，出了问题，发射中止。在考虑第三次尝试后，SpaceX的工作人员打电话取消了飞行，推迟了发射。从好的方面来看，SpaceX称猎鹰9号火箭仍处于良好状态。

更新美国东部时间3月1日下午3:56:SpaceX现在的目标是3月4日星期五的发射。

Update February 28th, 7:36PM ET: After delaying the launch due to a boat within range, SpaceX aborted the mission right as the countdown reached zero. The company said that there was an abort in the ignition sequence, but did not immediately explain what caused it. The launch will be rescheduled for some time soon; SpaceX says the rocket and spacecraft are safe.

Update February 27th, 1:12PM ET: The launch has been rescheduled for Sunday, February 28th, at 6:46PM ET.

Update February 25th, 6:47PM ET: SpaceX aborted the launch this afternoon. The team called "hold" during the countdown, which scrubbed the launch. At the time of the call, there were issues with loading the rocket's propellant, which resulted in an overall abort.

Update February 24th, 6:17PM ET: SpaceX is postponing the launch until tomorrow, February 25th, at 6:46PM ET. No reas*** were given for the delay, but the company said the "rocket and spacecraft remain healthy."

Correction: A previous version of this story said that SpaceX attempted a rocket landing on Sunday, but it was delayed instead. We apologize for the error.

这就是为什么SpaceX不应该被比作蓝色起源的着陆