How many years after the Big Bang did the planets form?

1 Answer
Feb 3, 2016

If you are referring to our planets, the ones in our solar system, they formed about 4.6 billion years ago, while the Big Bang was 13.8 billion years ago.


If referring to the planets in our solar system, they formed
#13.8-4.6=9.2# billion years later. But our planets are not the only ones - we have detected many planets in other systems, with the oldest detected planets being around 12.8 billion years old, so they formed about 1 billion years after the big bang.

There are likely even older planets, as yet undiscovered.