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1. It would have been plainly visible because the sub would have illuminated it. We can see Venus with the naked eye...everyone on the side of the Earth facing it would have been able to see it.
2. There would have been gravitational effects on Earth. The moon already helps control the tides and keeps the Earth's rotation steady. An object six times bigger than it would likely have wreaked havoc down here.
3. An object six times larger than the moon would be larger than the Earth. Can't say the would bode well for the moon sticking around in its current orbit.
4. Amateur astronomers would have seen it coming. I mention them because some people would argue that official space agencies would cover it up. Don't you think Wikileaks would have a field day with documents discussing a cover-up of a massive object approaching Earth?
5. If you indeed saw something like that, it would have to be even larger given the distances involved. Everything from the asteroid belt to the oort cloud (since it would have had to come from further out) would have been affected, sending balls of rock and ice shooting throughout the solar system. People would have noticed a sudden large number of impacts on planets like Jupiter, since its immense gravity would have pulled a bunch of the new objects in.