Meet Marv! Marv is an awesome physics dog who has volunteered
to help us generate a universe.
We are going to use the light and dark areas of Marv’s image to
make a quasi-random distribution of mass in an infant universe.
Here you can see our new universe. The darker areas have
relatively more mass, and the lighter areas have relatively
The areas with more mass have a stronger gravitational pull,
and suck in mass from the lighter areas.
This causes the mass to become even more concentrated in the
areas that were originally dark.
There is so much mass in the darkest areas that eventually
a “sheet” representing that mass folds in on itself.
And folds in more….
This forms a web of dense filaments surrounding
nearly empty space. We call this the Cosmic Web.
The filaments contain almost all of the mass of
the universe – the galaxies, and within them, the stars.
The areas in between contain almost nothing! The largest
empty ‘hole’ we’ve found is over a billion light years
The Cosmic Web of our Doggie Universe is similar to the
Cosmic Web we observe in our own universe.
This image from the Sloan Digital Sky Survey’s 3D map
of the universe shows our Cosmic Web. Each dot is a galaxy.
No animals were harmed in the making of this universe.