Question

The hydrogen and helium in our solar system were created from subatomic particles about ______ years ago.

a. 14 billion
b. 10.5 billion
c. 7.0 billion
d. 4.5 billion

Answer 1

The correct answer is: a. 14 billion.

According to Big Bang theory, during the formation of the universe 14 billion years ago, only the hydrogen and helium were formed (with a trace of lithium and beryllium). Other elements were created in nuclear reactions (in huge stellar explosions).