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The 4G mission is set to launch from Cape Canaveral in the United States on a space X Falcon 9 rocket in 2019.

4G 任务将于2019年从美国卡纳维拉尔角发射，搭载的是 space X 猎鹰9号火箭。

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The suid and sgid bits occupy the same space as the x bits for user and group in a long directory listing.

suid 和 sgid 位与长目录清单中用户和组的 x 占据相同的空间。

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The X-15 was the first major investment by the United States in manned space flight technology.

VOA: special.2010.07.07

They felt the X-15 could have continued to provide new information about aviation and space.

VOA: special.2010.07.07

Today,the X-15 hangs in the Air and Space Museum in Washington,D.C.

VOA: special.2010.07.07

The agency has already spent billions of dollars on the National Aerospace Plane, the X-33, X-34, X-37, X-38 and the Orbital Space Plane.

FORBES: Magazine Article

Latest example of NASA bloated spending: The agency has already spent billions of dollars on the National Aerospace Plane, the X-33, X-34, X-37, X-38 and the Orbital Space Plane.

FORBES: Magazine Article

Measurements undertaken with two space-based X-ray telescopes imaged the black hole at the centre of galaxy NGC 1365.

BBC: First glimpse of a black hole's spin