Earth is believed to have been formed in the solar system of the galaxy named $P$ about $Q$ years ago.
$\quad\quad\quad P \quad\quad Q$
$\quad\quad\quad P \quad\quad Q$
- AMilky Way,$4.5$ million
- BMilky Way,$4.5$ billion
- CAndromeda,$4.5$ million
- DAndromeda,$4.5$ billion
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