What is "metal" to an astronomer?
A) Any element heavier than hydrogen
B) Any element heavier than hydrogen or helium
C) Any element in solid or liquid form that can conduct electricity easily
D) Any element

Question

Quizplus · Accepted Answer

In astronomy, "metal" refers to any element heavier than hydrogen or helium. This is because hydrogen and helium are the two most abundant elements in the universe and everything else is considered a "metal" in comparison.

What Is "Metal" to an Astronomer