so much of it, in some orbits, that this is not always possible, and the occupants of manned ships and stations sometimes have to literally take shelter and just hope and pray that nothing that is about to hit them kills them.
A fleck of paint smaller than the size of the word âpaintâ on this page, travelling at 24,750 miles per hour, has been known to take out a vesselâs window panel that was designed to withstand the heat and stresses of re-entry through the atmosphere from orbit. These bands of debris are potentially dangerous, and must be taken into account if you are going to attempt any form of landing from space.
Invading and subduing or destroying Earth and its people will not be a matter of fighting your way to the homeworld of the civilization, and then trying to establish a foothold there. There is no resistance to any approach to the planet, and so any operation to capture or destroy it will only be a matter of consolidating a successful arrival.
That said, there are some military groups and organizations who will certainly be the first ones to take an interest in your arrival. There are few, if any, terrestrial military or intelligence organizations devoted to protecting the Earth from assault from offworld, although rumours and stories of such secret units have persisted for several decades at least. However, there are some militaries and governments whose mandate does â or at least may â specifically cover eventualities such as alien invasion.
THE UNITED STATES AIR FORCE
The United States Air Force (USAF) is the most advanced military aviation service on the planet, though not the largest, which is the Chinese Air Force. The USAF is tied very closely with Americaâs National Aeronautics and Space Administration (NASA) which has mounted the most successful space missions from the Earth to other planets in the Solar system. For many years, most of NASAâs space travellers and test pilots were assigned from the USAF, though this policy has been relaxed, with people from other services and even civilians allowed to participate in offworld missions.
The USAF was instrumental in developing air-launched anti-satellite weapons, which could be adapted to attack descending ships on attack missions, or even spacecraft in close orbit of the planet. Along with the US Navy, they have tested laser weapons, though these have so far been clumsy and not suited to tracking manoeuvrable vessels.
Some decades ago, the USAF conducted Project Blue Book, a study into UFO sightings and reports of alien incursions.
The USAF is also the parent organization of the US Space Command. As the name implies, this group deals with both military applications in space, and threats from space. Ordinarily this means natural bodies such as asteroids and meteors, and ballistic projectiles launched into orbit from other terrestrial nations. Nevertheless, this means they are the military service most likely to detect and attempt to intervene with your approach.
This is especially the case if you attempt to visit Earth by means of a pre-existing network of wormholes.
THE BRITISH ARMY
Although Britain is a small island whose empire has fallen, and whose power has waned, the British Army has extensive experience in successful defences against invasion by the rest of the planet, and in conducting its own successful colonizations.
Since the 1950s, the Army has been shown to have been involved in dealing with several possible extraterrestrial incursions, from defending the historic Westminster Cathedral to the notorious Hobbs Lane incident.
THE UNITED NATIONS
Although it is not strictly a military organization, the UN does sometimes provide an umbrella banner for military peacekeeping operations in various nations. These forces are drawn from different national militaries across the globe. It is therefore quite possible that, in response to your campaign of conquest, the UN could arrange for the alliances of