3I/ATLAS. A cat on my balcony

(En español aquí ) S ummary Recently, a new interstellar object passing through our solar system has been discovered: 3I/ATLAS. This object has sparked much curiosity and is being intensely studied by astronomers worldwide. A paper uploaded to the arXiv preprint server suggests the possibility that this object might actually be an alien spacecraft secretly preparing to attack us at the end of this year. This peculiar idea is based on a series of coincidences supposedly too unlikely for a natural object. In this article, written for a general audience without requiring prior knowledge, I counter each of these alleged improbabilities. The first sections (Sections 1 and 2) present general reflections on the danger of establishing criteria after the fact to defend an implausible hypothesis. We discuss aspects of the philosophy of science that are important to understand why science must be conducted with rigorous and disciplined methodologies. This first p...