Cosmometry

Abstract

When we consider the shortness of the four thousand years of recorded astronomical observation with respect to the age of the universe and the travel time of light from its distant objects, we can understand that the observable events in the universe lie in essence on our past light cone [10]. The space at the time of the formation of neutral atoms is cut by this cone in a nearly spherical surface. This is the reason why we observe this instant, which divides the observable universe from the more distant past, as a boundary in space, an opaque fireball. In an ideally isotropic universe, this boundary appears as a sphere. Loosely speaking, the universe is transparent inside the fireball and opaque behind; in addition, behind the fireball is before the fireball.