558 years ago.
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1998 considering the year is now 2011.
27000 years ago was approximately 25000 BCE.
1-1.8 million years ago was approximately 0.2-0.8 million years ago.
Since we're currently in the 21st century - 700 years ago.
The Earth is believed to have coalesced as a solid body roughly 4.5 billion years ago.