You might think that it is the same astron showing up in catastrophe.
But no. Catastrophe has nothing to do with stars, not even etymologically.
Catastrophe comes from Latin catastropha, from Greek katastrophē ‘overturning, sudden turn’, from kata- ‘down’ + strophē ‘turning’ (from strephein ‘to turn’).
It was originally (in the 1500s) a theatrical term, designating the final resolution or dénouement of the plot in a play. In a tragedy, this usually involved the death (or "overturning") of the protagonist. It was possible, though, to have happy or comical catastrophes. But because there were many tragedies, the association with an unhappy ending soon took over, so that catastrophe soon came to mean "a disastrous or unhappy conclusion". By the end of the 1700s it acquired its current meaning "a disastrous, usually widespread, event."
A question: While we are all confined to quarters, how frequently would you like Wordlady updates? Daily (not sure that I could keep that up, to be honest)? Twice a week? Once a week? Please let me know. I want to keep you entertained but I don't want to overwhelm you.