Asteroid shower on the Earth-Moon system immediately before the Cryogenian period revealed by KAGUYA

Terada, Kentaro; Morota, Tomokatsu; Kato, M.

doi:10.1038/s41467-020-17115-6

Cited by 19 publications

(13 citation statements)

References 59 publications

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“…For example terrestrial craters found in Europe, North America and Australia indicate that the collision rate of diameter 𝐷 > 1𝑘𝑚 projectiles has increased by up to a factor of 3 during the past 100 Myrs (Bottke et al 2007a;Shoemaker 1998;Gehrels 1995;McEwen et al 1997;Terada et al 2020;Ward & Day 2007). Similar indications are obtained from lunar craters including the 109 Myr old Tycho crater.…”

Section: Effects Of a Gravitational Transition On The Solar System Ch...mentioning

confidence: 99%

Is the Hubble crisis connected with the extinction of dinosaurs?

Perivolaropoulos¹

2022

Preprint

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It has recently been suggested that a gravitational transition of the effective Newton's constant 𝐺 eff by about 10%, 50-150 Myrs ago can lead to the resolution of both the Hubble crisis and the growth tension of the standard ΛCDM model. Hints for such an abrupt transition with weaker gravity at times before the transition, have recently been identified in Tully Fisher galactic mass-velocity data and also in Cepheid SnIa calibrator data. Here we use Monte-Carlo simulations to show that such a transition could significantly increase (by a factor of 3 or more) the number of long period comets (LPCs) impacting the solar system from the Oort cloud (semi-major axis of orbits 10 4 𝐴𝑈). This increase is consistent with observational evidence from the terrestrial and lunar cratering rates indicating that the impact flux of kilometer sized objects increased by at least a factor of 2 over that last 100 Myrs compared to the long term average. This increase may also be connected with the Chicxulub impactor event that produced the Cretaceous-Tertiary (K-T) extinction of 75% of life on Earth (including dinosaurs) about 66 Myrs ago. We use Monte-Carlo simulations to show that for isotropic Oort cloud comet distribution with initially circular orbits, random velocity perturbations (induced e.g. by passing stars and/or galactic tidal effects), lead to a deformation of the orbits that increases significantly when 𝐺 eff increases. A 10% increase of 𝐺 eff leads to an increase in the probability of the comets to enter the loss cone and reach the planetary region (pericenter of less than 10AU) by a factor that ranges from 5% (for velocity perturbation much smaller than the comet initial velocity) to more than 300% (for total velocity perturbations comparable with the initial comet velocity).

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Section: Effects Of a Gravitational Transition On The Solar System Ch...mentioning

confidence: 99%

Is the Hubble crisis connected with the extinction of dinosaurs?

Perivolaropoulos¹

2022

Preprint

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“…After these C elegans were retrieved from the crash site all but two displayed normal growth and reproductive egg laying behavior. As argued by (Szewczyk et al 2005), what they experienced is analogous to being embedded on the surface of an asteroid that breaks into fragments upon striking the atmosphere, and then surviving after those fragments smash into the ground Eight hundred million years ago, the Moon and Earth, were struck by a flurry of asteroids that likely profoundly affected the biosphere (Terada et al 2020). As summarized by Terada et al (2020): "Based on crater scaling laws and collision probabilities... meteoroids, approximately 30-60 times more powerful than the Chicxulub impact, must have plunged into the Earth-Moon system.…”

Section: Fossils On Mars? Evolution and Interplanetary Transfer?mentioning

confidence: 99%

Seeding the Solar System with Life: Mars, Venus, Earth, Moon, Protoplanets

et al. 2020

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In the space of the entire universe, the only conclusive evidence of life, is found on Earth. Although the ultimate source of all life is unknown, many investigators believe Earth, Mars, and Venus may have been seeded with life when these planets, and the sun, were forming in a galactic cluster of thousands of stars and protoplanets. Yet others hypothesize that while and after becoming established members of this solar system, these worlds became contaminated with life during the heavy bombardment phase when struck by millions of life-bearing meteors, asteroids, comets and oceans of ice. Because bolide impacts may eject tons of life-bearing debris into space, and as powerful solar winds may blow upper atmospheric organisms into space, these three planets may have repeatedly exchanged living organisms for billions of years. In support of these hypotheses is evidence suggestive of stromatolites, algae, and lichens on Mars, fungi on Mars and Venus, and formations resembling fossilized acritarchs and metazoans on Mars, and fossilized impressions resembling microbial organisms on the lunar surface, and dormant microbes recovered from the interior of a lunar camera. The evidence reviewed in this report supports the interplanetary transfer hypothesis and that Earth may be seeding this solar system with life.

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“…The results show that craters formed in the Copernican System are scattered all over the lunar surface in the study area. Recent research 47 has pointed out that sporadic meteoroid bombardment occurred across the whole Moon at ~800 Ma.…”

Section: Resultsmentioning

confidence: 99%

Lunar impact crater identification and age estimation with Chang’E data by deep and transfer learning

et al. 2020

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Impact craters, which can be considered the lunar equivalent of fossils, are the most dominant lunar surface features and record the history of the Solar System. We address the problem of automatic crater detection and age estimation. From initially small numbers of recognized craters and dated craters, i.e., 7895 and 1411, respectively, we progressively identify new craters and estimate their ages with Chang’E data and stratigraphic information by transfer learning using deep neural networks. This results in the identification of 109,956 new craters, which is more than a dozen times greater than the initial number of recognized craters. The formation systems of 18,996 newly detected craters larger than 8 km are estimated. Here, a new lunar crater database for the mid- and low-latitude regions of the Moon is derived and distributed to the planetary community together with the related data analysis.

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Asteroid shower on the Earth-Moon system immediately before the Cryogenian period revealed by KAGUYA

Cited by 19 publications

References 59 publications

Is the Hubble crisis connected with the extinction of dinosaurs?

Is the Hubble crisis connected with the extinction of dinosaurs?

Seeding the Solar System with Life: Mars, Venus, Earth, Moon, Protoplanets

Lunar impact crater identification and age estimation with Chang’E data by deep and transfer learning

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