Which of the following statements about Oumuamua is true?

• A. It is a typical asteroid within the solar system.
• B. It is a man-made object.
• C. It is the first object of its kind observed in our solar system.
• D. It originated from a distant star system.

Answer: (C)

Interstellar objects travel through our solar system from other star systems, and their motion is unbound by the Sun’s gravity, meaning they follow hyperbolic paths rather than closed orbits. Oumuamua, discovered in 2017, was the first such object detected passing through our solar system. Its trajectory and speed indicate it came from outside, not from within, and it wasn’t a typical solar-system asteroid or a man-made artifact. This made it the first object of its kind observed in our solar system. The other statements don’t fit because a typical asteroid is bound to the Sun, a man-made object would have clear, human-made traits or history, and while it likely originated outside our solar system, the standout, defining fact is that it was the first such interstellar visitor we observed.