Kicked Out

The Orion Nebula stands halfway up the southern sky a couple of hours after sunset right now. To the eye alone, it looks like a fuzzy star. In reality, though, it’s the birthplace of thousands of stars.
Many of those stars are still in or around the nebula. But at least two that were born in that region are racing away from it at more than 200,000 miles per hour. They probably were kicked out by an encounter with two other stars, which appear just above the nebula.
One of the escapees stands high atop the sky, in Auriga, the charioteer. The other is in the opposite direction from Orion, down near the horizon in Columba, the dove. Under dark skies, that star, Mu Columbae, is visible to the unaided eye.
Simulations show that both stars were ejected from Orion about two-and-a-half million years ago.
The ejection happened after two binary systems passed close together. Each binary contained two big, hot, massive stars.
A study a few years ago found that the encounter split both binaries ap