Post by scabab on Sept 5, 2018 10:36:28 GMT
Lack of an ability to do so, obviously characters like Hulk, Captain America, Hawkeye and Black Widow can not fly nor at least can the latter three breathe in space.
Iron Man was shown to lose power almost straight after going through the portal so he couldn't have done anything.
Which only leaves Thor, who can travel through space in a straight line using the bifrost but that's all they've shown and as I said he was dealing with Loki anyway.
So given the fact that several countries have nuclear missiles (more than 1 in fact), the Chitauri were really no threat at all to the planet, just Manhattan.
And the one Nuke they actually used was going to destroy Manhattan and end millions of lives. They'd have been able to stop those Chitauri but then others could have come through after that.