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Meteorite weathering is the terrestrial alteration of a meteorite. Most meteorites date from the oldest times in the Solar System and are by far the oldest material available on our planet. Despite their age, they are vulnerable to the terrestrial environment. Water, chlorine and oxygen attack meteorites as soon as they reach the ground.
Some meteorite types are easier to find than others. Some meteorite types are degraded by weathering more quickly than others. [1] Some meteorites, especially iron meteorites, may have been collected by people in the past who recognized them as being unusual and/or useful, thereby removing them from the scientific record.
[1] An Earth-grazing fireball (or Earth grazer) [2] is a fireball, a very bright meteor that enters Earth’s atmosphere and leaves again. Some fragments may impact Earth as meteorites, if the meteor starts to break up or explodes in mid-air. These phenomena are then called Earth-grazing meteor processions and bolides. [1]
When a large meteorite hits a planet, it can radically deform the rocks and regolith that it hits. The heat, pressure, and shock of the impact changes these materials into impactite. [ 3 ] Only very massive impacts generate the heat and pressure needed to transform a rock, so impactites are created rarely.
A 6.5 km diameter crater at in the volcanic plains to the northwest of Elysium Mons has been identified as a possible source Based on the crater dimensions, the inferred growth rate of the source volcano during that interval is 0.4–0.7 m per Ma, far slower than would be expected for a terrestrial volcano, and implying that Martian volcanism had slowed greatly by that point in history.
Locating a softball-sized space rock in the wilderness may be similar to finding a needle in a haystack: Pitt said the estimated area where the meteorites hit is about a mile wide (1.6 km) and ...
The Geminids are a prolific meteor shower with 3200 Phaethon (which is thought to be an Apollo asteroid [4] with a "rock comet" orbit. [5]) being the parent body. [6]Because of this, it would make this shower, along with the Quadrantids, the only major meteor showers not originating from a comet.
Gas-rich meteorites are meteorites with high levels of primordial gases, such as helium, neon, argon, krypton, xenon and sometimes other elements. [1] Though these gases are present "in virtually all meteorites," [ 2 ] the Fayetteville meteorite has ~2,000,000 x10 −8 cc STP / g helium, [ 3 ] or ~2% helium by volume equivalent.