How do we know that the Universe is 13.8 billion years old?*1 pointWe can calculate the age based on half livesWe can calculate when the universe came from a cosmic explosion by back-calculating based off of how fast it is currently expandingWe asked someone who was thereWe are guessing

Estimate the age of the universe in seconds using the Hubble constantH0 = 70 km s–1 Mpc–1.

According to the Big Bang Theory, the universe is approximately _________ years old. a13,800 b1.38 million c1.38 billion d13.8 billion

According to Hubble time and the Big Bang, how old is the universe approximately?Group of answer choices14- 15 billion years2017 years14-15 million years14,000 years

Our solar system formed ______ billion years after the big bang.*1 point156914

How old is our planet Earth?4.6 billion years old6,000 years old4.6 million years oldWe do not have enough information to accurately date the age of Earth.