What would happen if the world ended

Hey everyone! This is just a sample story for something that I would like to write, but don't know if anyone would like it. Please let me know if it's good or enjoyable and you would like more!

Faye and Farah are witnessing something that they've never seen before. there's a big black figure in the sky, flying way too close to the ground to be a spaceship, and is way too big to be a plane. The world may be ending in front of their eyes.