I remember participating in a newsgroup thread in late 90s. The thread was created by a sci-fi writer (or, a lunatic who claimed he was a writer). In the end, he said he was going to publish these ideas into a book. I don't know he published it or not. Even if he never published it, I believe this should be on-topic here because we allow fan fictions.
There were thousands of messages in the thread. So, I never even had time to read all of them, but I remember main points from finalized draft:
A small alien spaceship crash lands in ISS which would disrupt its orbit and it'd go on course to crash on Earth.
NASA would adjust ISS's course to make it crash into ocean.
Later, they would come to know that the crash would destroy half the planet. Initially, alien spaceship's engine was planned as a cause of destruction, but later I pushed an idea of making head of the alien go nuclear and OP loved it.
In the end, the Earth was saved, but I don't remember how.
Can you identify this as published short story, book or Internet fan fiction?
I have already searched Usenet for 90s. It's not in my mind which newgroup it was. I just remember using email (Hotmail) to send or receive messages. I have also forgotten which email address I used (which I can find if I look but my personal cloud is very big), but there were two words in it: "rocket" and "cosmos/cosmic". Also, the OP's email address contained the word "ninja." It's possible that the newsgroup archive would mask the email today, so you can look for name in header "Rocket".