You cannot truly say that it is either. Vertical and horizonal are relative terms. The Milky Way floats ins space, where there is not defined up or down, and therfore no horizontal or vertical.
The Sun is not tilted in the way that some planets are; it rotates on its axis, but its axis is not significantly tilted relative to its orbit around the Milky Way galaxy. However, its axis is tilted slightly in relation to its orbit around the center of the galaxy.
"Horizontal" isn't really the correct "scientific" way to describe it, but the answer is Uranus.
The orientation of the solar system plane is tilted at an angle of about 60 degrees relative to the plane of the Milky Way galaxy.
Earth's axis is tilted to about 11 degrees from the vertical.
The orbital plane of a stellar system can be oriented in any way in relation to the plane of the Milky Way Galaxy. Our solar system, for example, is almost perpendicular to the plane of the Milky Way Galaxy.
a sandstone layer is found tilted at an angle of 75° from the horizontal. what probably caused this 75° tilt?
"Tilted", compared to what? While it is true that the Earth's axis of rotation is tilted at about 60 degrees when compared to the plane of the Milky Way galaxy, this isn't a factor that we normally consider. The Earth's axial tilt of 23.5 degrees compared to the ecliptic is more important.
There no milky way in sky there is only milky way galaxy
The Milky Way galaxy is.... called the Milky Way Galaxy
The galaxy that contains Earth and the rest of the Solar system is the Milky Way galaxy.
Zero. We are in it
the milky way is just the name of our galaxy, there isn't really a "milky way"