We can't see exoplanets from distant galaxies. I think you've got things a bit confused.

Absolutely not. They're might be a slowdown while they investigate causes and find ways to mitigate risk but deaths don't stop space programs.

That's pretty cool. Would we know about it? Or would it be an immediate big crunch?

I feel like you need to explain why this is scary. Because to me, thats just a paragraph.