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NASA has revealed that a huge star was bouncing off our solar system at a time when "spears and stone spikes were the pinnacle of human technology."
Some 70,000 years ago, a red dwarf star "brushed" the outside of the house of mankind, potentially disrupting small objects in a distant shell of icy rocks and a comet called the Oort cloud.
Obviously, this planet was not touched by the star or its "companion", a brown dwarf, as it would probably have been destroyed.
But our solar system suffered a "near-failure" that would have frightened the bejesus of every human being on Earth if it had happened in the era of modern communications.
Although it is unlikely that passing stars pose a physical hazard to the Earth, their gravitational attraction could disrupt objects on the edge of the solar system and push them onto a collision course with our beautiful planet.
NASA wrote: "It is not clear if the near-collision was close enough to give objects in the cloud Oort, the halo of sleeping comets in our solar system, a gravitational boost to fall to the Sun. .
"But the interstellar intruder brings to light a sometimes forgotten reality: in the long run, stars seem to fly like sparks from a campfire, sometimes getting close enough to disrupt themselves.
Stars could also become "thieves" who end up flying planets from other suns.
There is very little chance that our ancestors saw the star.
"And did these early humans hammering and shaping the spear have glimpsed the passage of the star?" Nasa asked.
"It turns out that it's unlikely."
More: Technology
"Scholz's star is a red dwarf, the smallest and weakest star we know.
"Even at its closest point, at about 55,000 astronomical units of our Sun (5.1 trillion miles), Scholz's star would have been a hundred times too dark to be seen with the naked eye.
"Yet there is a chance that the visitor will be known.
"It is known periodically that red dwarfs emit extremely bright shards. If the star sent a rocket as it crossed our solar system, our cave-dwelling ancestors might have seen it. "
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