Question

1. why are the models of solar systems that you can purchase in stores not to scale?

Explanation:

Store-bought solar system models cannot be to scale because the actual distances between planets and the size difference between the Sun and planets are extremely large. If made to true scale, either the planets would be too tiny to see (e.g., Earth would be a speck smaller than a pinhead in a model where the Sun is a basketball) or the model would need to be impossibly large (many meters or kilometers wide) to fit the true orbital distances, making it unmarketable and unusable for display.

Answer:

Store-bought solar system models are not to scale due to the extreme disparities in real solar system sizes and distances:

1. The Sun is vastly larger than all planets combined—scaling it to a visible size would make planets microscopic.
2. The orbital distances between planets are enormous; a true-scale model would be far too large to sell or display practically.