Scientists are trying to find the age of Ex. Ex is a moon which is in a different solar system than ours. Like ours, objects in Ex's solar system formed together in a nebula. Which of the following is a correct conclusion?(1 point)

Question

Responses

The half-life of carbon-14 is 5,730 years old. Since there is no carbon-14 left on Ex, scientists conclude that it is 11,460 years old.
The half-life of carbon-14 is 5,730 years old. Since there is no carbon-14 left on Ex, scientists conclude that it is 11,460 years old.

Scientists find a rock from Ex. Using radiometric dating, they determine it is around 3 billion years old, so they conclude that Ex is around 3 billion years old.
Scientists find a rock from Ex. Using radiometric dating, they determine it is around 3 billion years old, so they conclude that Ex is around 3 billion years old.

Scientists find a rock from a planet in Ex's solar system. It is 7 billion years old. They conclude that Ex is at least 7 billion years old.
Scientists find a rock from a planet in Ex's solar system. It is 7 billion years old. They conclude that Ex is at least 7 billion years old.

Ex is 4.6 billion years old, because solar systems were created at the same time.

Answer 1

The most scientifically valid conclusion from the options provided is:

Scientists find a rock from Ex. Using radiometric dating, they determine it is around 3 billion years old, so they conclude that Ex is around 3 billion years old.

This conclusion is based on direct evidence obtained through radiometric dating, which is a reliable method for determining the age of rocks and therefore provides the most accurate assessment of the age of Ex. The other options either make incorrect assumptions or do not provide a valid basis for determining Ex's age.