Nothing memorable.
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Since 1.9 years ago is roughly equivalent to 1 year and 10 months, any number of events could have occurred during that time. Without additional context, it is impossible to provide a specific answer.
Approximately 13.8 billion years ago.
Earth did not exist 700 billion years ago, nor did the universe. Earth is about 4.6 billion years old.
we landed on the moon
The "Big Bang" occurred about 13.8 billion years ago, marking the beginning of the universe as we know it.
200 million years ago