Aliens will come in peace not war.

To summarise the situation. 1: Intelligent Aliens are travelling in a space ship towards earth. 2: Humanity is aware of this. 3: The ship will arrive in a year. 4: The aliens have either come in peace, or intend to wage war. It is highly unlikely that the aliens have come from a world in our solar system, at least not originally. It is reasonable to presume that should an advanced alien race have developed in our system we would have been in receipt of their radio signals for many years, just as our own radio signals 'pollute' our region of space. It is also likely that our probes would already have crossed paths. So I argue that the aliens are from another Star System. This gives us the following options, 1: Faster than/Equal to/Near Light Travel The aliens are so advanced that they can travel between Stars in a reasonable time frame. Instantly, or a few years, as opposed to the millions of years that many scientists fear we shall be restricted to. Such a technology is so in advanced of us that its posessers would be able to view us, study us, even interact secretly with us. For instance mankind is not far from proper direct observation of interstellar planets (we are already detecting them and analysing their atmospheres) and these aliens are so much more in advance of us. In addition this technology is not consistent with the fact that the observed vessel is one year away from us. So I do not believe that this option is reasonable. 2: Sleeper/Generation ships. The aliens are not so advanced and are restricted to relatively slow interstellar transports. They may have developed suspended animation (in which the passengers are 'frozen' somehow) or Generation ships, in which the vessel is a self-contained colony and the aliens now travelling to earth are descendants of the original crew and passengers. Such a vessel would throughout it's long journey accelerate, until reaching the mid point of the journey before decelerating during the second half of the journey. This may explain why the vessel is still a year away, (which also affords time for the aliens to awaken or mobilise for war). It is also consistent with the fact that the alien technology is not so advanced that humanity can still detect the vessel. It is for these reasons that I suggest the alien vessel is a sleeper/generation ship. In such a situation the continued existence of the aliens is a precarious and uncertain one, they may have been travelling for millions of years, are very lucky to have survived and have nothing to go back for, it is almost certain that their primary goal is to find a world on which to establish a colony. Though alien life may have evolved to any number of enviroments, these aliens have decided to head for earth. Even though they should be aware of the presence of mankind. It is therefore certain they intend to colonise earth. They will know that an industrialised race such as mankind will have used up most of the avaliable living space on their world. They will therefore know that in order to establish a colony they will have to 'displace' the indigenous population, in other words go to war. My opponent may ask, 'why haven't the aliens already nuked us', the reason is that they intend to colonise us with the maximum retention of resources. Be that farmland, human slaves, or even our exisiting buildings. It is for these reasons I affirm it is more likely than not that the aliens are here for war.