Let’s suppose that aliens where able to travel from distant galaxy to earth. Let’s suppose that they didn’t travel to dispose of resources abundant on earth (i

Let’s suppose that aliens where able to travel from distant galaxy to earth. Let’s suppose that they didn’t travel to dispose of resources abundant on earth (in which case it seems obvious that they would most likely already ostensibly or furtively dominating the world with their advanced technologies). For example, instead they want to make tourism in invisibility-intangibility suits: "look my darling, how quaint this planet is!". I very strongly doubt any group of human could catch an alien vehicle of such an advanced civilization.