Astronomical distances. Spiral galaxies like our own Milky Way measure approximately lig...

Astronomical distances. Spiral galaxies like our own Milky Way measure approximately light-years in diameter, where 1 light-year (ly) equals the distance traveled by light in 1 year. Our nearest-neighbor galaxy is the great spiral galaxy Andromeda, which has been determined to be approximately 2.5 million ly away. Construct a scale model to show the sizes of the Milky Way and Andromeda galaxies using two pie tins each 20 cm in diameter. To keep the model to scale, how far apart would these pie tins need to be separated?