Hypothesizing without data? On the 'doubt it but possible' side of things, the tesseract could have brought a star through, much closer to the earth than those besides our sun usually are, realized its mistake, and sent it back. But I suspect it's more likely made by some intelligent species, human or otherwise, and it was meant to do something. There weren't any organized attacks reported or bank robberies or anything of the sort, as a result. So the light itself caused something.