Evidence suggests that Earth once had rings, but they were fainter than Saturn's

Although Saturn is the most famous of them, today we know that there are four planets in the Solar System that have rings.

Ghost moons, the enigma discovered by a Polish astronomer in Earth's orbit
The Trojans of Jupiter's orbit and the Lucy probe sent by NASA to investigate them

Saturn's rings are the brightest, but the other three giant planets—Jupiter, Uranus, and Neptune—also have them. Less well known to the public is the possibility that other planets in our small neighborhood, including our beloved blue home, Earth, once had rings in the very, very distant past.

In November 2024, Andrew G. Tomkins, Erin L. Martin, and Peter A. Cawood, from Monash University in Australia, published a scientific report entitled "Evidence suggesting that earth had a ring in the Ordovician", in which they state the following:

"All large planets in our Solar System have rings, and it has been suggested that Mars may have had a ring in the past. This raises the question of whether Earth also had a ring in the past. Here, we examine the paleolatitudes of 21 asteroid impact craters from an anomalous ∼40 m.y. period of enhanced meteor impact cratering known as the Ordovician impact spike, and find that all craters fall in an equatorial band at ≤30°, despite ∼70 % of exposed, potentially crater-preserving crust lying outside this band."

Regarding this coincidence, the report notes that it "has long been suggested to result from break-up of the L chondrite parent body in the asteroid belt," and in this regard, its authors propose the following thesis: "a large fragment of the L chondrite parent body broke up due to tidal forces during a near-miss encounter with the Earth at ∼466 Ma. Given the longevity of the impact spike and sediment-hosted L chondrite debris accumulation, we suggest that a debris ring formed after this break up event, from which material deorbited to produce the observed crater distribution. We further speculate that shading of Earth by this ring may have triggered cooling into the Hirnantian global icehouse period."

The YouTube channel Astrum has published an interesting and comprehensive video based on that study, explaining what the Earth's ring could have been like:

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Imagen principal: Astrum.