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They dont become larger they become farther apart from other galaxies
Irregular galaxies are believed to have been spiral or elliptical galaxies in the past, which have been distored through gravitational pull of neighboring galaxies.
Images become dominated by galaxies.
The " Big Bang "
Mainly that the Universe is expanding. Analyzing far-away galaxies, it has recently become clear that the expansion is accelerating - the Universe is now expanding faster than a few billion years ago.
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Galaxies are a whole lot bigger than planets. And astronomical pictures (x-rays, visible light, etc,) don't reveal much about individual stars, much less planets, within them. Astronomers have become very good at figuring out quite a bit about the Universe from pretty scant data.
It will continue to expand
In fact, most galaxies are moving away from all the other galaxies in the universe. Think in terms of expansion. There is no clearly identifiable central spot from which everything emanated, but the galaxies are clearly expanding away from one another. There are occasional collisions of galaxies; we will collide with Andromeda at some point perhaps millions of years from now. This is because there are clusters of galaxies which seem to clump together, orbit around each other and otherwise interact.
if you have the ability to do it
Basically, the Universe will eventually run out of fuel - of useful energy.