17 trillion seconds = approx 540 thousand years.
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Zero. There was no time measured that long ago.
1 trillion years = approx 31557600000000000000. However, the univere did not exist a rillion years ago and, according to current cosmological theories, it will not exist for a trillion years. So the answer is a meaningless exerise in multiplication.
The answer is unknown.
1989 was 23 years ago.
2515 years ago.