If the alien invasion hypothesis is confirmed, US $ 4 trillion / year, will be invested in defense against the threat, in a combined global GDP effort. The supernationals and the entire planet will be forced to make a major budgetary effort on world GDP. On an annual basis, it will be necessary to invest in new strategic and tactical defensive armament on a solar scale, a figure not less than 4 trillion dollars per year, that is, almost 8 times the budget of the United States armed forces. Only by means of this intensive capital scale, it could be obtained in the short term, development of space super-technology and armament, at the height of an enemy with the evolutionary advantage of several thousand years in its favor. The discovery of more and more exoplanets fit for life, affirms the hypothesis of the existence of other civilizations, which can be hostile and at any time can detect our presence. All of which leads to the need to put together a global defensive plan for the Earth, with the right budget. Such financing power will accelerate the space race.