posted on May, 3 2013 @ 10:21 PM
An artificial object, "100 times the size of the Earth".
Our sun has a radius that is 109 times that of the Earth.
You've basically describe something about half the size of our sun.
Have you seen Jupiter in our night time sky? Even at 664,520,800 km away, it is very bright. As bright as -2.94 mag. And you could fit 10 Jupiters
across our sun.
Now, an object that size is going to reflect a LOT more light, and would be as bright from very, very far away, and easily seen not only by amateur
astronomers, but every day people just looking up at the night sky.
That means it would be detected by said amateur astronomers much, much further away from that, out past the kuiper belt.
The government could try and keep it secret all they want. But something that huge, bigger than any other object in our solar system except for the
sun could not be kept secret in any way, shape or form.
It would have to be made out of a material that does not reflect much visible light (but then it would be visible in the IR spectrum). However, as it
approached, it would start blocking out the light of stars that we can see and that are recorded on star charts. So we'd still end up seeing it quite
a ways out, simply because it's blocking star light.
I'm sorry, but I just don't see how any government on Earth could keep something like that a secret. They'd have to make everyone blind to do that.