Final answer:
In the hypothetical scenario where you could travel through the Sun, you would experience a gradual increase in gas density without encountering solid features like mountains. The Sun is composed of layered gases, and visibility becomes clearer only near its outer layers.
Step-by-step explanation:
If you were able to travel through the Sun without being burned or crushed, you wouldn't encounter solid land-like features such as mountains. Instead, you would experience a gradual increase in the density of the gas surrounding you, much like falling through a cloud while skydiving. The Sun does not have a solid surface; it is composed of different layers, similar to an onion. Specifically, the photosphere only appears sharp from a distance. While approaching or moving through the Sun, a photon's journey could be compared to moving through a dense crowd at a rally, becoming visible only upon reaching the Sun's atmosphere where atoms are less densely packed.