The term "fodder" in the passage is closest in meaning to which of the following?

Explanation

Although no black hole has been directly observed or examined, the idea has served as abundant material for science fiction authors and theoretical exploration by physicists and astrophysicists. Black holes represent one of the more extraordinary theoretical predictions of general relativity. The prevailing model describes black hole formation as the collapse of a massive star. For stars with a mass four to five times that of our sun, the exclusion principle—the repulsive force between particles within the star—cannot counterbalance the star’s gravity. As the star’s density increases, this force is overwhelmed, leading to unstoppable gravitational collapse. The star contracts until it forms a singularity, a point of infinite density and zero volume. This results in a region of spacetime where gravity is so strong that nothing, not even light, can escape, effectively removing the star from observable space. Physicists speculate about the fate of an astronaut entering a black hole, suggesting destruction by intense gravity or gamma-ray bursts near the singularity. Some theories propose that surviving such a journey would cause extreme time distortion, allowing the astronaut to perceive the entire future of the universe in moments.