Question

16. The ____________________ belt contains perhaps tens of thousands of objects orbiting within about 100 AU of the sun. (1 point)

17. The material that formed the solar system originated from a solar ____________________. (1 point)

18. Nuclear fusion within the sun takes place within the ____________________. (1 point)

19. In an H-R diagram, most stars are found in a diagonal band from the upper left to the lower right, which is called the ____________________.