Credits an Explanations of Photos.
FIG.
1: (Taken from NASA) This is a computer simulation of the large-scale
structure of the Universe, created by a group of scientists known as the Virgo
Consortium. The box "measures" 300 million light years on a side. The big bright
spots are clusters of galaxies, while the smaller dots represent individual
galaxies and groups of galaxies. The knot near the lower center of the picture
appears to be what we believe is a good representation of the merger system
Abell 754. The filamentary structure of the Universe is apparent, and we believe
that mergers happen at the intersection of the filaments. In some sense the
merging clusters "hit" each other at these locations. Credit: The Virgo
Consortium (See NASA's page on the
merger of galaxies.) Our galaxy is approximately 0.0033% of the size of this
image. Our galaxy is about 100,000 light years across and contains around
100,000 million stars. A light-year is about six trillion miles, or 63,241 AUs.
An AU is the average distance from the Earth to the sun, about 93 million miles.
FIG
2: This figure is also from the Virgo Consortium, from their
Hubble
Volume Simulations. You can find this photo and an explanation of it on
this page.
The fist image represents approximately 4.6% of the width of second image.
In turn, the second image represents about 1.3% of the width of the universe,
based on the
latest thinking.