Question

The universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. While the spatial size of the entire universe is unknown, it is possible to measure the size of the observable universe, which is currently estimated to be 93 billion light-years in diameter. In various multiverse hypotheses, a universe is one of many causally disconnected constituent parts of a larger multiverse, which itself comprises all of space and time and its contents. How old is this earth?

Options:
A) 4.5 billion years
B) 6,000 years
C) 93 billion years
D) 1 million years

Answer 1

The Earth is estimated to be 4.5 billion years old, which is significantly younger than the observable universe, with the latter being around 13.8 billion years old since the Big Bang.

Step-by-step explanation:

The Earth is approximately 4.5 billion years old, according to current scientific evidence and cosmological models. This estimate is supported by a range of geological and astronomical measurements, such as radiometric dating of minerals and the cooling rates of planets. The age of the Earth is a small fraction compared to the age of the observable universe, which astronomers estimate to be about 13.8 billion years old, dating back to an event known as the Big Bang. It's important to note that Earth's formation occurred around 9 billion years after the Big Bang, during the formation of our solar system within the Milky Way galaxy.