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Pre-Noachian: the interval from the accretion and differentiation of the planet about 4.5 billion years ago to the formation of the Hellas impact basin, between 4.1 and 3.8 Gya. [13] Most of the geologic record of this interval has been erased by subsequent erosion and high impact rates.
At least two-thirds of Mars' surface is more than 3.5 billion years old, and it could have been habitable 4.48 billion years ago, 500 million years before the earliest known Earth lifeforms; [4] Mars may thus hold the best record of the prebiotic conditions leading to life, even if life does not or has never existed there. [5] [6]
The Noachian period occurred from 4.1 to 3.7 billion years ago, and little is known from direct measurements dating to the pre-Noachian period on Mars, between 4.5 billion and 4.1 billion years ...
4.5 billion Mars reaches the same solar flux as that of the Earth when it first formed 4.5 billion years ago from today. [97] < 5 billion The Andromeda Galaxy will have fully merged with the Milky Way, forming an elliptical galaxy dubbed "Milkomeda". [100] There is also a small chance of the Solar System being ejected.
While meteorites in the same family as NWA 7635 were all dated about 500 million years old — meaning they were formed from cooling magma on the surface of Mars circa half a billion years ago ...
The bottom of the Jezero Crater – believed to have formed 3.9 billion years ago from a massive impact – is considered to be among the most promising areas on Mars to search for evidence of ...
360-degree view of a region on Mars called "Bright Angel", where an ancient river flowed billions of years ago. Cheyava Falls is slightly right of center, about 361 feet (110 meters) from the rover. [8]
The lunar cratering record suggests that the rate of impacts in the Inner Solar System 4000 million years ago was 500 times higher than today. [44] During the Noachian, about one 100-km diameter crater formed on Mars every million years, [ 3 ] with the rate of smaller impacts exponentially higher.