"Dangerous Astronomy" shows us the softer side of jealousy (if there is one). Here, a father gets jealous of his infant son. But what's interesting is how the poem turns jealousy upside down. It's an emotion that causes the speaker to ask deeper questions about himself and his motivations as a parent. So instead of wallowing in jealousy, this poem uses it as an engine to move the speaker through his confusion. He moves from being alarmed at his own jealousy to accepting his faults and asking for forgiveness.
The speaker's jealousy is really just a mask for his deep-seated insecurity as a dad. He is afraid he can't hack it, so he takes it out on his family. Not cool, dude. So not cool.
Jealousy's a good thing here, because it allows the dad to really understand where he fits in with his family, and what needs to change.