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The Moon bears the scars of an early Solar System, when debris was all around, and worlds collided.
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The Moon bears the scars of an early Solar System, when debris was all around, and worlds collided. Similar events are happening in other newly forming planetary systems, and astronomers think the repercussions could last for millions of years. They simulated the Beta Pictoris system, with a Neptune-mass planet impacting a giant planet with 13 Jupiter masses, and found that it would still be varying in brightness for millions of years, detectable with modern instruments.
Seismic Oscillations Excited by Giant Impacts in Directly-Imaged Giant Planets
Abstract page for arXiv paper 2505.01496: Seismic Oscillations Excited by Giant Impacts in Directly-Imaged Giant Planets
arXiv.org (arxiv.org)
