I am not entirely sure what you mean by space lines, but if you mean, spaceships that make regular trips to other planets, the way that ocean liners travel to other continents, then yes, they are science fictional.
A space cat would have to be some kind of science fictional concept. We know of no species of cat that is indigenous to outer space.
We have fictional science that exists right now, like Creationism. It is possible to live in a world in which fictional science exists, but it will not be accurate.
The Science Fictional Solar System was created in 1979.
The Science Fictional Solar System has 317 pages.
How to Live Safely in a Science Fictional Universe was created in 2010.
How to Live Safely in a Science Fictional Universe has 256 pages.
The ISBN of How to Live Safely in a Science Fictional Universe is 0-307-37920-5.
The fictional drug CPH4 is not real and is purely a creation of science fiction.
It isn't. It is a fictional chemical.
A science that deals with substance and element is the fictional science
what do you mean fictional like never exist or something, are you dumb or something
Time meridians are theoretical lines that represent the flow of time across different dimensions or points in space. They are used as a concept in science fiction to illustrate the idea of time travel or alternate realities. However, they do not have a basis in scientific fact and are purely a fictional construct.