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Time of Earth's beginnings.(Knight Ridder Newspapers)

Knight Ridder/Tribune News Service

| March 01, 2002 | Boyd, Robert S. | COPYRIGHT 2002 Knight-Ridder/Tribune News Service. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

WASHINGTON _ Although scientists disagree on some points, here is the most widely accepted timeline of Earth's beginnings:

_4.57 billion years ago: Our solar system forms out of the collapse of a huge cloud of gas and dust in the Milky Way galaxy. Astronomers estimate the age of the solar system by radioactive dating of elements found in meteorites that later landed on Earth.

_Between 4.56 billion and 4.5 billion years ago:

Earth consolidates from a band of smaller rocks left over from the creation of the solar system. The planet's birth may have lasted only 28 million years, a blink of an eye in geologic time.

_Between 4.5 billion and ...

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Source: HighBeam Research, Time of Earth's beginnings.(Knight Ridder Newspapers)

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