A scientist is observing a rock found near a crater where an asteroid once collided with Earth. The scientist wants to determine if the rock they are observing is from Earth or from the asteroid. The oldest rock on Earth is 4.5 billion years old. The rock from the asteroid is much older than rock on Earth. The scientist uses U-235 U-Pb dating on the rock and finds that 55% of the uranium-235 in the rock has changed to lead-207. Which statement is best supported by the scientist's evidence?