4600 million years ago
4600 thousands
4,600,000,000
4600
The Precambrian period was from 4600 million years ago to about 542 million years ago.
The Sun is middle aged it formed 4600 million (4,600,000,000) years ago and will shine for another 5400 million years.
4 600 000 000 = 4.6*109 in standard form.
Peru is part of the Planet Earth. The planet is about 4600 million years old.
Earth! also expressed as 4.6 billion years old
about 5.5 billion years ago