In 2006, astronomers with the NASA-backed Catalina Sky Survey in Arizona discovered a peculiar body floating amid the sea of thousands of human-made satellites orbiting our planet. After taking a closer look, they determined that the object wasn’t just another piece of space junk. Rather, it was a natural satellite that had been temporarily yanked into a tagalong orbit with the Earth, similar to the moon.
This “minimoon,” designated 2006 RH120, was just a few meters in diameter. But unlike the actual moon, this cosmic body was a transient Earth companion, traveling around the planet for only a year before being ejected from our planet’s orbit. More than a decade later, scientists with the Catalina Sky Survey spotted another minimoon (2020 CD3) — this one about the size of a small car — roaming through Earth’s orbit, before it was flung out of the Earth-moon system’s influence in March 2020.
Because of their proximity to Earth, these minimoons have warranted close scientific scrutiny. But more recently, some experts have eyed minimoons and other near-Earth asteroids for a different reason: They have the potential to act as stepping stones in our exploration of the cosmos.
“We have yet to become an interplanetary species,” Richard Binzel, a professor of planetary sciences at the Massachusetts Institute of Technology, told Live Science. Minimoons could become milestones “to achieve as you’re learning how humans can operate in interplanetary space, and ultimately reach Mars.”
Stepping stones
In September 2016, NASA launched the uncrewed OSIRIS-REx spacecraft on a mission to collect a sample from the potentially hazardous asteroid Bennu, which has a 1-in-2,700 chance of slamming into Earth in 2182. Seven years later, OSIRIS REx returned to Earth with a tiny chunk of the 4.5 billion-year-old asteroid.
The success of the OSIRIS-ReX mission has inspired scientists planning the next phases of near-Earth exploration. One idea is to use close asteroids as stepping stones for missions to Mars, Binzel said.
Retrieving Bennu was a step in the right direction, he said, but there might be a better target when it comes to testing our technology to expand further into the cosmos. At its closest, Bennu is around 186,000 miles (300,000 km) away from Earth and only crosses the planet’s orbit around the sun…
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