Article: Asteroids may have boosted life on Earth 3.9 billion years ago.

Article: Earth's Bombardment by Asteroids 3.9 Billion Years ...
Ascribe Higher Education News Service;  May 20, 2009 ;     700+ words ... ... The bombardment of Earth nearly 4 billion years ago by asteroids as large ... there was life on Earth before 3.9 billion years ago. We know from the ... blow 4.5 billion years ago, vaporizing itself and part of Earth. The collision would ...

Article: Life on Earth may have first emerged 4.4 billion ...
Xinhua News Agency;  May 21, 2009 ;     660 words ...Life on Earth may have first emerged 4.4 billion years ago: study LONDON, May 21 (Xinhua) -- Life on Earth may have begun about 4 ... formation (4.5 billion years ago) were capable of destroying Earth's crust and wiping out ...

Article: World's oldest object offers insight into the Earth 4.6 ...
The Independent - London;  January 11, 2001 ;     688 words ... ... about 4.4 billion years ago and is the oldest identifiable object on Earth, has overturned ... creation is that the Earth formed about 4 ... to 4.6 billion years ago from debris left ... collision between the Earth and a Mars-sized planet 4.45 billion years ago. ...

Article: Researchers find evidence of space rock smashing Earth ...
AP Worldstream;  August 22, 2002 ;     634 words ... ... WASHINGTON Nearly 3.5 billion years ago, when the Earth was just a billion years old ... lot of material that hit the Earth back then, Stanley said ... asteroid that hit the young Earth 3.47 billion years ago was about twice the size of ...

Article: Earth's magnetic field 3.2 bln-years-ago as ...
The Hindustan Times;  April 5, 2007 ;     700+ words ... ... London, April 5 -- Earth's magnetic field ... strong 3.2 billion years ago as it is today ... could mean the Earth already had a solid ... core 3.2 billion years ago, which is at the ... sheltering the Earth 3.2 billion years ago," said Tarduno ...

Article: HOW WE ALL BROKE THE ICE MILLIONS OF YEARS AGO ...
Seattle Post-Intelligencer (Seattle, WA);  August 28, 1998 ;     700+ words ... ... lifeless. That was Earth 750 million years ago in what may have been ... million and 750 million years ago, Earth went through at least ... including, perhaps, Earth's collision with a ... asteroid - some 65 million years ago.

Article: Rocks show life on Earth emerged earlier than believed ...
The Milwaukee Journal Sentinel;  November 7, 1996 ;     700+ words ... ... we could dig into Earth's sedimentary rock ... least 3.85 billion years ago, but this is not ... life 3.5 billion years ago. Simple life forms have ruled the Earth for most of its existence ... about its origins. Earth and the other planets ... nebula 4.5 billion years ...