Question

What are the four characteristics that scientists use to classify stars? A. size, brightness, temperature, and composition B. size, distance away from us, temperature, and color C. location, distance away, color, and number of planets that orbit it D. heat, temperature, distance away, and size

Answer 1

The answer to the question above is most likely letter "A. size, brightness, temperature, and composition." All stars are huge spheres of glowing gases. They are most likely made up of hydrogen and some helium. The energy they have is due to the process called Nuclear Fusion.