Definition of Assonance. Assonance is the repetition of a vowel sound or diphthong in non-rhyming words. To qualify as assonance, the words must be close enough for the repetition of the sound to be noticeable. Assonance is a common literary technique used in poetry and prose, and is widely found in English verse.
Nevertheless, scientists have been able to determine the probable age of the Solar System and to calculate an age for the Earth by assuming that the Earth and the rest of the solid bodies in the Solar System formed at the same time and are, therefore, of the same age.
So, now you're an expert astronomer who can calculate something as interesting as the age of our universe. That age is estimated to be about 13.7 billion years! About 13.7 billion years ago, the Big Bang occurred. The Big Bang is an explanation of how the universe began from an infinitely compact state, and it thus marks the age of our universe.