Re: The Gaia Galaxy
Analogy #2 - Milky Way Galaxy - How big is it?
Our Milky Way galaxy is simply huge. To fully comprehend just how large, again we turn to an analogy. Just how big is our galaxy? Let's now pretend that our galaxy is a kid's sandbox, and our sun is a grain of sand in a sandbox. The Earth is a miniscule dust speck near the grain of sand, too small to be seen without a microscope.
If our sun were a grain of sand in this sandbox representing the Milky Way galaxy, the sandbox would be somewhat oval and yet flat, and would be about 20 feet in diameter. The sand would be about 12 inches thick in the center, and thinner towards the edges.
Our Milky Way Galaxy
moving out of our own galaxy ...
Now that we have an idea of how large our own galaxy is, we can turn our sights to more distant objects. There are billions of other galaxies in the Universe besides our own. The closest large galaxy to our Milky Way galaxy is the Andromeda Galaxy, just barely visible naked eye from a dark sky site. The space between galaxies is very empty, devoid of stars and even dust. About the only tangible thing that exists between galaxies is light itself.