Originally Posted by Kareeah_Indaga
Or, alternatively, use the Bifrost like Loki did back in Thor 1 - as a large cannon.
Even better. I’d forgotten the Bifrost has a Death Star button.

So yeah, with Heimdall targeting, the Bifrost could strike Thanos’ ship at essentially any range. We know unequivocally that Maw does not breathe vacuum well, and the other Children are even less likely to. Thanos might, but if his ship is vaporized around him, all he can do is flap his arms in the dark of lightyears between stars.

Originally Posted by Kareeah_Indaga
Speaking of transit, does Asgard have a fleet of its own?
They seem to have moved beyond starships, since the Bifrost is the only way we see them get around. After it was destroyed in Thor 1, they were apparently cut off from the galaxy, apart from Odin wielding the Bifrost energy by hand, or however he did it.

Also, the fact that there wasn’t an exodus of starships when the Asgardians were hiding from Hela in the mountain strongly suggests they had no way of leaving Asgard. And Loki’s arrival with the Statesman, proclaiming he was their savior, wouldn’t have had so much dramatic satisfaction for him if there had been other ships parked on the lawn.