If the universe were sufficiently dense, k would equal +1, meaning that its average curvature throughout is positive and the universe will eventually recollapse in a , possibly starting a new universe in a.
The value of R as a function of time t depends upon k and the Λ.
At around 47,000 years, the of matter became larger than that of photons and , and began to dominate the large scale behavior of the universe.
During the , models were also proposed by the , and by the and.
Philosophical models See also: , , , , and The and Indian philosophers developed some of the earliest philosophical concepts of the universe.
If we will analyze how many , planets, and the distances involved for reaching them, and the fact that our Universe is expanding, then it certainly seems infinite.