The article said "Let's imagine what horseshoe orbits might look like with a pair of Earth-size worlds in the sun's habitable zone — the area surrounding a star temperate enough for liquid water to survive on a planet's surface. Let's name these worlds Terra and Tellus, both Latin words for "Earth."
Well this is intriguing. I have not seen horseshoe orbits described so far for any exoplanets confirmed, now more than 4300. I did a gravity force measurement comparison using the present Earth-Moon system and compared to twin Earths coming within 0.05 AU of each other (4 or 5% 1 AU). Present force for Earth-Moon system at 60.3 earth radii is about 1.983E+25 dynes cm^2 s^1. The worlds Terra and Tellus coming within 0.05 AU and similar in earth mass experience 4.25E+24 dynes cm^2 s^-1. So would Terra and Tellus be a stable orbit over long time spans?
Interesting, horseshoe shaped orbits
One more item from this report. "The length of these cycles of approaches and departures depends on the width of the horseshoe orbits. For Terra and Tellus, the horseshoe orbits would extend from about 0.995 AU to about 1.005 AU, so it would take about 33 years between close encounters, Raymond said. The tiny shifts in distance from the sun would likely mean the climates of Terra and Tellus would not change much as they switch between sides of their horseshoe orbits, he noted."
It would seem Terra and Tellus every 33 years would undergo a mutual force of gravity measurement change on the two bodies. That would need to be considered, e.g. increased volcanic activity? Io at Jupiter is an example.
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