According to the giant-impact hypothesis, the Moon was created during a collision between Earth and a large object about the size of Mars.

根据“巨型撞击假说”，月球是在地球和一个火星大小的物体相撞时形成的。

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Such a titanic collision between Earth and a Mars-size impactor may have given rise to Earth's Moon.

地球和火星大小的撞击物发生如此巨大的碰撞，可能导致了月球的形成。

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Merges become challenging and lengthy as the size of the collision set grows.

随着冲突集大小的增长，合并变得越发具有挑战性和冗长。

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Galex - a space telescope designed to search for the ultraviolet light that newly born stars put out - hinted that NGC 6872 was made much larger in size by the collision.

BBC: Galaxy crash sparks biggest spiral

That suggests a wave of star formation that travelled down the arms, set off by the collision with IC 4970, with the newest stellar neighbourhoods pushing the galaxy into the top spot in terms of size.

BBC: Galaxy crash sparks biggest spiral