Posted by: shadowhawk1013
First off, there was no ark within onyx. Onyx was a shield world
Second, the ark isn't anywhere NEAR reach. In fact the ark is 2 to the 18th power lightyears away from the center of the galaxy, which is well beyond the edge of the galaxy, so no they wouldn't have noticed it.
Just because cortana knows how to use forerunner technology does not mean that she is constantly aware of everything forerunner related. Otherwise she'd be WAY more powerful and would know pretty much everything about the galaxy.
Master Chief DID NOT GO TO REACH AT THE END OF HALO 3. People continue to assume this while all of the evidence supports him being anywhere in the galaxy other than reach. In fact, he's not at onyx or another human occupied world at all. At this point in the halo timeline onyx is just a dyson sphere a few meters across surrounded by billions, if not trillions or more, sentinels.
We also know that masterchief is not at a previously occupied human world because EVERY SINGLE HUMAN WORLD WAS GLASSED. Generally when a planet is glassed from orbit there aren't any structures remaining on the ground that would give off light or reflect light in actual shapes like the ones at the end of halo 3.
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I only said maybe not that cortana did, i said maybe... and yes there wasn't forrunner base anywhere near Reach (that we know of)... and yes its not a human planet... and yes the sheild world they are stuck in is small but may have portals of its own to other forrunner bases.