[4][3] The brightness of the star, TOI-178, facilitates followup observations, which make it an ideal system in which to expand our understanding of planet formation and evolution.
[1] Of the six planets, named TOI-178b through TOI-178g as per IAU convention, the outer five are locked in a chain of Laplace resonances.
While this is not a perfect integer ratio, there exists a frame of reference that rotates by roughly 1.37° day−1, in which successive conjunctions of the planets form a repeating pattern.
In a slightly bigger orbit of period of ~1.95 days, it would form a 3:5 resonance with the planet c in the same corotating frame of reference as the other five.
It is possible that the entire system originally formed in one long resonant chain, but later the innermost planet was pulled out of it, perhaps by tidal interactions.