Question

29 the sun and all the planets, that make up what we call the solar system, formed
about 5 billion years ago
within seconds after the big bang
about 1 million years ago
before the big bang

Explanation:

The solar - system formed about 5 billion years ago. The Big Bang occurred about 13.8 billion years ago, and the solar system formed long after that. It didn't form within seconds after the Big Bang, nor about 1 million years ago, and it couldn't have formed before the Big Bang as the Big Bang is the start of the known universe's timeline.

Answer:

about 5 billion years ago