Several scientific organizations have announced the detection of what appears to be an interstellar comet, which has consequently received the designation 3I/ATLAS. It could be a large comet, with an estimated width of around 20 kilometers, but the first estimates of the size of its nucleus are still very rough. Its trajectory will take it within the orbit of Mars, but, together with its considerable speed, it will only lead to a limited direction change by the Sun’s gravity. Unfortunately, it will never get close enough to Earth to allow detailed observations, but any interstellar object is very interesting for astronomers. This is the third officially recognized “visitor” after 1I/ʻOumuamua in 2017 and 2I/Borisov in 2019.