Originally Posted by sassyT
Scientist do not KNOW with certainty how old the earth is.
FACT: In the 19th century, it was proposed that the Earth may be as much as 70 million years old. Then, certain evidence was brought to light indicating that evolution was not possible in so short a time. So, the age of the Earth was pushed back.
FACT: During the 20th century, it was thought that the age of the Earth was as much as 1 billion years old. Now, with the development of radiometric dating and the application of that technique on the meteorite "Allende", it is thought that the world is up to 4.6 billion years old. However, this is not conclusive though. The assumptions that are fundamental to radiometric dating are extremely controversial, and are not held to be reasonable by some scientists and many leading scholars. Radiometric dating is flawed in that it is founded upon a series of faulty assumptions.
Ultimately, the age of the earth cannot be proven with certainty. Whether 6,000 years or 4.6 billion years – both viewpoints (and everything in between) rests on faith and assumptions. Those who hold to 4.6 billion years trust that methods such as radiometric dating and the assumptions they make are reliable.