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This is no paradise, but, somehow, life gains a toehold then is nearly frozen out.
Another competitor, this one the size of Mars, crossed Earth's path.
Finally, after over three days travelling at 60-million years an hour, I've driven back four-and-a-half-billion years. We have arrived in the darkness at the edge of time.
When the first rays of the newborn sun shone out into space, they illuminated a scene of untold cosmic violence.
The aftermath was the formation of our pale, airless companion: the moon, and the red-hot, iron-rich ball of rock we know today as home.
Understanding the fiery birth of the earth really helps explain how the engine of our planet works.