The Sun and Moon are the same object. All colors have the same wavelengths. The Sun is closest to the Earth in the summer. The Hubble Space Telescope gets great pictures because it is closer to the stars. Stars are points of light because they are so small.
Stars are points of light because they reflect so little light.
A mountaintop is the best place for an observatory because it is closer to the stars. A mountaintop is the best place to build an observatory because the lower gravity reduces the building cost.