Space rocks may have bounced off baby Earth

Those responses to long-ago collisions could help explain why the two worlds are so different

Squabbling sibling planets may have hurled space rocks when they were young.

Simulations suggest that space rocks the size of baby planets struck both the newborn Earth

That difference in early impacts could help explain why Earth and Venus are such different worlds today

The pronounced differences between Earth and Venus, in spite of their similar orbits and masses,

 scientist Shigeru Ida of the Tokyo Institute of Technology, who was not involved in the new work.

Scientists have typically thought that there are two ways that collisions between baby planets can go. 

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