The Nemesis Theory states that there is a companion dwarf star that is close to our Sun. If the writer wants to provide additional evidence to this he should use this version of the underlined text;
The underlined text above that was chosen as the right option is a statement that shows a conclusion that was reached by the scientists.
It shows that a certain huge, elliptical orbit that was seen could be an unseen twin.
This gives credence to the Nemesis Theory that says that there is an unseen twin star beside our sun.
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