The movie is primarily about either a Godzilla like monster or a virus that kills off people. The scenes I’m remembering have two astronauts and a dog in space and they radio to earth where they are told that things were bad down on Earth. They can’t return. One astronaut dies or maybe gets the disease that is killing people, and a female astronaut is left.
In one of the final scenes, the spacecraft is crashing down to earth and takes out whatever is destroying earth.
Any help would be great!