Sentence examples for billion years on from inspiring English sources
And people ask more questions about trivia — "How tall is the Statue of Liberty" (answer: 305 feet) and "How old is the earth" (4.54 billion years) — on mobile devices than on computers.
In contrast to Earth's geologic timescale, whose divisions get finer as we approach the present day, the past three billion years on Mars, during which little has changed, are considered one long era (the Amazonian, another ironic choice of names).
Other scientists pointed out that geologic processes, like naturally occurring nuclear fission, have been used to determine that the fine structure constant has probably changed little over the past two billion years on Earth.
Fig. 4 Temperature profiles every 1 billion years on Mars calculated from the surface heat flow and the present-day abundance of radioactive isotopes.
One way to settle the question that doesn't rely on isotopes involves studying Mars, which, unlike Earth, still has rocks older than 4 billion years on its surface.
For 4.5 billion years on Earth, life has continued to survive and evolve, developing more complexity, diversity, and with more information encoded in its DNA.
Five years on came sweet revenge.
Is that really tenable, fifty years on?
Twelve years on, such fears seem fanciful.
Three years on, the effects show.
