January 21, 2020
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January 14, 2020
Gameplay
Classic recreates the game in the state it was in after patch 1.12.1, c.September 2006, before the launch of The Burning Crusade expansion. The maximum level of the player characters is set to 60, all expansion content is absent, and almost all the gameplay mechanics of the original version have been exactly replicated.[4]As the game's multiple expansions have dramatically changed the gameplay over time,Classic allows players to relive the original experience, albeit some modern interface and functional enhancements introduced in later expansions have been integrated, as well as re-patching of bugs and exploits that were present at the original release of patch 1.12.
Players can choose from the eight original races of World of Warcraft:humans,dwarves,gnomes and night elvesfor the Alliance, and orcs,trolls,tauren and the Forsaken for the Horde. The original nine classes are present:druid,hunter,mage,paladin,priest,rogue,shaman,warlockandwarrior. As in the original version of the game, only Alliance players can become paladins, and only Horde players can become shamans. Races and classes added in the expansions, such as worgen or death knights, will not be available in the game. The game world is restored to its original, pre-Cataclysm state, and expansion areas such as Outland are not accessible.
To emulate the original game's patch release cycle, content inClassicwill release in phases.This means that game content originally released in patches, such as the Blackwing Lair, Ahn'Qiraj, and Naxxramas raids, battlegrounds like Warsong Gulch and Alterac Valley, and certain items and quests, will become available after launch according to a six-phase schedule. Unlike the content patches for the original game, these phases will not modify the core game mechanics such as character abilities in any way; the game balance is set to the 1.12.1 version of the game.
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Scientists analysing a meteorite have discovered the oldest material known to exist on Earth.
They found dust grains within the space rock - which fell to Earth in the 1960s - that are as much as 7.5 billion years old.
The oldest of the dust grains were formed in stars that roared to life long before our Solar System was born.
A team of researchers has described the result in the journal Proceedings of the National Academy of Sciences.
When stars die, particles formed within them are flung out into space. These "pre-solar grains" then get incorporated into new stars, planets, moons and meteorites.
"They're solid samples of stars, real stardust," said lead author Philipp Heck, a curator at Chicago's Field Museum and associate professor at the University of Chicago.
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A team of researchers from the US and Switzerland analysed 40 pre-solar grains contained in a portion of the Murchison meteorite, that fell in Australia in 1969.
"It starts with crushing fragments of the meteorite down into a powder," said co-author Jennika Greer, from the Field Museum and the University of Chicago.
"Once all the pieces are segregated, it's a kind of paste, and it has a pungent characteristic - it smells like rotten peanut butter."
This whiffy paste was then dissolved in acid, leaving only the stardust.
"It's like burning down the haystack to find the needle," said Philipp Heck.
To work out how old the grains were, the researchers measured how long they had been exposed to cosmic rays in space. These rays are high-energy particles that travel through our galaxy and penetrate solid matter.
Some of these rays interact with the matter they encounter and form new elements. The longer they are exposed, the more of these elements form. The researchers used a particular form (isotope) of the element neon - Ne-21 - to date the grains.
"I compare this with putting out a bucket in a rainstorm. Assuming the rainfall is constant, the amount of water that accumulates in the bucket tells you how long it was exposed," said Dr Heck.
Measuring how many of the new elements are present tells scientists how long the grain was exposed to cosmic rays. This in turn informs them how old it is.
Some of the pre-solar grains turned out to be the oldest ever discovered.
Based on how many cosmic rays had interacted with the grains, most had to be 4.6-4.9 billion years old. For comparison, the Sun is 4.6 billion years old and the Earth is 4.5 billion.
However, the oldest yielded a date of around 7.5 billion years old.
More to be found
Dr Heck told BBC News: "Only 10% of the grains are older than 5.5 billion years, 60% of the grains are "young" (at) 4.6 to 4.9 billion years old, and the rest are in between the oldest and youngest ones.
"I am sure there are older pre-solar minerals in Murchison and other meteorites, we just haven't found them yet."
Previously, the oldest pre-solar grain dated with neon isotopes was around 5.5 billion years old.
The findings shed light on a debate over whether or not new stars form at a steady rate, or whether there are highs and lows in the number of new stars over time.
"Thanks to these grains, we now have direct evidence for a period of enhanced star formation in our galaxy seven billion years ago with samples from meteorites. This is one of the key findings of our study," said Dr Heck.
The researchers also learned that pre-solar grains often float through space stuck together in large clusters, like granola. "No one thought this was possible at that scale," Philipp Heck explained.
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