How long ago do scientists think the solar system formed?
A: 6.2 billion years ago
B: 4.6 billion years ago
C: 4.3 billion years ago
D: 2.6 billion years ago
1 answer
B: 4.6 billion years ago
A: 6.2 billion years ago
B: 4.6 billion years ago
C: 4.3 billion years ago
D: 2.6 billion years ago
1 answer