Final answer:
Approximately 31.25 galaxies like our own would need to be laid edge-to-edge to reach the nearest galaxy, which is approximately 2.5 million light-years away.
Step-by-step explanation:
The Andromeda Galaxy is approximately 2.5 million light-years away from our Milky Way Galaxy, and the diameter of our galaxy is about 80,000 light-years. To determine the number of galaxies like our own that would be laid edge-to-edge to reach the nearest galaxy, we can divide the distance between galaxies by the diameter of our galaxy.
Number of galaxies = Distance to nearest galaxy / Diameter of our galaxy
Number of galaxies = 2.5 million light-years / 80,000 light-years = 31.25 galaxies
Therefore, it would take approximately 31.25 galaxies like our own, laid edge-to-edge, to reach the nearest galaxy.