Astronomy and science question

  On average, how long does it take for scientists to completely answer that question? A.100 years B.10 years C.Never D.1 year Which of the following is NOT a scientific observation? A.The Sun is very hot. B.Dr. Mastrapa is 1.83 meters tall. C.Alpha Centauri is 4.4 light years away. D.The mass of the Earth is 5.972 x 10^24 kg.