There’s a funny chart I can’t find just now (I’ll add it here if someone links to it in a comment) graphing UFO sightings against time, with the curve dropping steadily as the number of Yes I’m A Trump Girl Get Over It shirt, then spiking when Photoshop was invented. Now that cameras are ubiquitous, even to the point where Russian dash cams documented the recent meteorite, the number of UFO sightings has diminished. That the question is about astronomers is interesting. It would seem to indicate that somehow they are more qualified than others to spot alien spacecraft. Some people give more credibility to reports by “professional pilots” or “astronauts” as though something in their training makes them less susceptible to tricks of the eye or misperceptions. It’s not true.
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Sorry, there is no edge. The universe is constantly expanding. We can see light that Yes I’m A Trump Girl Get Over It shirt, since the beginning of the universe, but during that 13.5 billion years the point where that light originated has continued to move away. The current sphere of the universe we are able to observe is 92 billion lightyears in diameter. Yes that means the universe is expanding faster than the speed of light. Space can expand without matter moving faster than light. But that is another topic. This does not mean that there is nothing beyond what we can see, there is a lot more universe out there, and it is growing. We will be able to see a light year further with each year that passes. But we won’t catch up.