Does anyone have a guess whether the new contain defense tokens can be used against the face up damage card given by an asteroid field

Definately cannot.

Definitely not, it's not an attack, so you can't spend defense tokens. Just like you can't brace the damage from the debris field.

I would say it does not.

Contain is specifically standard crit effects. Asteroids are not a standard crit, they are just a face up damage card.

Ok that is what I thought thank you for clarifying