Spacing

[neilzero]

~Please correct the following~
Our Solar system is easily distinguished from others in our galaxy. The inner planets (Mercury, Venus, Earth and Mars) are spaced about a millionth of a light year apart. The outer planets (Jupiter, Saturn, Uranus, and Neptune) are spaced about ten times farther apart. We have found nothing from 0.005 to 4.2 light years, but we think some comets are orbiting our Sun, up to 2 light years from our sun. Likely other comets orbit the Centauri threesome up to two light years from these 3 stars which orbit each other. Possibly there are planets, but we have not found any yet. We have found some planets orbiting, some other stars, up to about 500 light years away from our Sun. This volume of space is less than one millionth of the volume of our galaxy, whose radius is perhaps 100,000 light years.
About 12 small galaxies, more or less orbit our galaxy in our local group of galaxies which includes Andromeda which is at least sightly larger than our galaxy that has the name Milky Way.
Local groups of galaxies are typically spaced at least 3 million light years apart, so there is a lot of empty space, as far as our science can tell at present, in between local groups, which have from one to a million? galaxies. The visible Universe is thought to have about 200 billion galaxies in perhaps ten billion local groups. Generally we can't identify local groups other than our own, so that ten billion may change drastically as we gather more data.
More than about 13.7 billion light years away, we think galaxies and some individual stars are receding from us at more than 186,000 miles per second = light speed, so we can't see them, and likely will never be able to see them. Possibly the unknown galaxies are a thousand times more numerous than 200,000 billion, but we will likely never know. Neil

[grapes]

~Please correct the following~
Our Solar system is easily distinguished from others in our galaxy.

How so? Because we are in it, and can see more detail?

[neilzero]

Likely best fixed by deleting the sentence. I was thinking that multiple star systems tend to over lap with some planets orbiting a single star, some orbiting two stars or even three stars. Our one star system is simple by comparison.
There may also be a problem because Earth passes closer to Venus more often than it passes almost as close to Mars. Venus passes closer to Mercury more often and a bit closer than the close approaches to Earth. We get similar different spacing among the gas giant planets.
Probably all the numbers can be fine tuned by the latest research. Neil

[Extrasolar]

~Please correct the following~
We have found some planets orbiting, some other stars, up to about 500 light years away from our Sun.

It is more like ~27500 light years to the farthest planet we have discovered, according to exoplanet.eu. (The closest is 10.5 LY away)

[speedfreek]

~Please correct the following~

More than about 13.7 billion light years away, we think galaxies and some individual stars are receding from us at more than 186,000 miles per second = light speed, so we can't see them, and likely will never be able to see them.

An apparent recession speed faster than c, due to the expansion of the universe, does not stop their light from reaching us. We will eventually see events that happened "today", 14 billion light-years away from here.