There has been no shortage of proposed explanations that have been put forth in order to account for the unusual observations, from the more mundane ones which include the presence of cometary fragments and large disk of debris from planetary collisions within the star system, to the more imaginative and fascinating ones which have invoked the presence of an extraterrestrial super-civilisation that is in the process of constructing gigantic megastructures around the star itself. (americaspace.com)
This animation shows a chaotic solar system and changing planetary orbits playing out over billions of years, illustrating the slight chance in the distant future of planetary collisions. (co2coalition.org)
Of course, if you are an atheist you could also understand that if an asteriod were to strike our planet today, we could see it as a judgement of the merits of humanity in the sense of humanities ability to pay attention to the things that it should pay attention to in order to survive a catastrophic planetary collision. (religion.blogs.cnn.com)