While the G-Man says this, dead Marines, the same ones sent to Black Mesa, a destroyed tank, and a downed fighter jet can be seen, showing the American military forces possibly having participation in capturing Xen, as well as the failure at their mission. The G-Man also stated at the end of Half-Life that he and his employers are in control of Xen after the defeat of Nihilanth.
In Half-Life 2, Resistance teleports are dependent on Xen for intra-dimensional transportation, since the matter stream utilizes the borderworld as a slingshot to teleport into local space.
The exact fate of Xen after the death of the Nihilanth in Half-Life is unknown, though it is sometimes mentioned in further installations of the series. Furthermore, several human characters including Gordon Freeman and Barney Calhoun are shown to be able to breathe in Xen without any additional life support. Xen's atmosphere seems to be similar to that of Earth's, as the Xen wildlife appears to have no trouble surviving on the planet. While it is possible that the "islands" are small chunks orbiting a larger and unseen planetoid, these unusual physics strongly suggest that Xen occupies an alternate dimension where conventional physics may simply not fully apply. Another feature is that gravity is always directed downwards, rather than towards the asteroid, so that one can actually fall off an asteroid into the void below. However, given that Xen is comprised of low mass asteroids, it is surprising that there is any appreciable gravitational pull at all, let alone a pull strong enough to retain an atmosphere. Xen is notable for having greatly reduced gravity compared to Earth's.
An example of the highly organic asteroid cavern-like areas explored on Xen.
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