Ms. johns shows her class a correct model of the solar system. what can the model show that is just like the real solar system?

a)
how heavy earth is

b)
how fast the sun spins

c)
how many planets there are

d)
how big the solar system is

Option C, How many planets there are

Explanation:

The model of solar system presented here is a static model which means it can only display the static characteristics. Therefore, this model only presents the number of planets in the solar system.  

In this model, weight of earth and size of the solar system can be resented through relative scale of weight such a one gram of weight representing 100000 Kg or 1cm representing 1 light year of distance but since no specific detail is given regarding any relative scale , thus option A and D are not the correct choice of answer

Option B is also not a correct choice of answer as speed is a dynamic characteristics and it cannot be represented in a static model.

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus