Some problems:


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.




I agree with eNumbra here...I'm calling shenanigans. If something that big were anywhere near us (and by near, I pretty much mean in the solar system), we'd know.

'Course I'd imagine that if some alien species was advanced enough to develop cloaking technology in the first place, their cloaking wouldn't be momentarily defeated by some light bouncing off a rock in space. In other words, if they could cloak well enough to hide as they floated through the solar system, they certainly wouldn't be uncloaked just because they were passing behind the moon


...and that would have to be one giant bat. Let's just hope our visitors don't have an anti-bat field around their...whatever it is.