Q: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
There are two known planets that orbit this kind of object, but a third is suspected to explain why the one is extremely hot, likely due to a recent collision. Over long periods of time, their atmospheres can accumulate methane, but like more massive objects, their atmosphere is fully convective. They fall into "L" and "T" spectral classes. A sure test for these is the presence of lithium, since stars begin to fuse lithium when they are at most one hundred million years old. A subclass of planetars, along with interstellar stars, FTP, identify these almost-stars too small to sustain hydrogen fusion.
A:
Science