Although I was thrilled, as usual, to hear of yet another discovery that might lead us to our brethren in the universe, I was dismayed to learn that our scientists have been in such disagreement about the requirements for planetary existence. It made me worry about how many other “requirements” they may have all wrong.
Joyce Stillman Odessa, N.Y.
The article describes the oldest planet known in the universe, about 12.5
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