DNA and RNA have now been found in meteorites
"Scientists uncover evidence of extraterrestrial DNA in meteorites"
Scientists have found the five building blocks of DNA and RNA, known as nucleobases, in meteorites. These nucleobases - adenine, guanine, cytosine, thymine and uracil - combine with sugars and phosphates to make up the genetic code of all life on Earth. The discovery adds to evidence that suggests life's precursors came from space, although whether they formed in space or on Earth is still not known. The research team used a new technique to gently extract and separate different chemical compounds in liquified meteorite dust and then analyze them, and found that their milder extraction technique kept the compounds intact, providing further evidence of their extraterrestrial origin.
Scientists have discovered that several meteorites, including the Murchison meteorite, contain the building blocks of DNA and RNA.
This supports the idea that a barrage of meteorites may have delivered the molecular ingredients needed to jump-start the emergence of the earliest life on Earth.
This is not the first time that components of DNA and RNA have been found in meteorites, but previously only adenine, guanine and uracil had been identified.
The new discovery includes trace amounts of all five nucleobases: adenine, thymine, guanine, cytosine, and uracil.
However, some scientists argue that the compounds may have ended up in the meteorites after the rocks touched down on Earth, rather than being extraterrestrial in origin.
This discovery of all five nucleobases in meteorites supports the idea that life's precursors originally came from space.
The concentration of DNA building blocks in meteorites needed to help drive the emergence of life on Earth remains under investigation.
The study's lead author, Yasuhiro Oba, suggests that the discovery of cytosine in meteorites is surprising, as it is relatively unstable and likely to react with water.
The study's findings were obtained through a new technique that uses cold water instead of acid to extract and separate different chemical compounds in meteorite dust
https://www.livescience.com/more-DNA-building-blocks-found-in-meteorites
Did all life on earth come from an asteroid?
It is currently a theory that some of the building blocks for life on Earth may have come from asteroids or meteorites. This theory is based on the discovery of certain components of DNA and RNA in meteorites. However, it is not yet clear if all of these components found in meteorites are of extraterrestrial origin and more research is needed to determine if this is the case. It is also possible that life on Earth could have originated through other means, such as through geochemical processes on the early Earth.
5 most famous meteorite strikes
Tunguska Event (1908) - This meteorite strike in Siberia is considered to be the largest impact event in recorded history. The explosion caused by the meteorite's impact leveled over 800 square miles of forest.
Chelyabinsk Meteor (2013) - A meteorite that struck the Russian city of Chelyabinsk caused widespread damage and injured over 1,000 people. The explosion was captured on video by multiple cameras and quickly went viral on the internet.
Barringer Meteorite Crater (Arizona, USA) - The Barringer Meteorite Crater, also known as Meteor Crater, is one of the best-preserved meteorite impact sites in the world. The crater was created around 50,000 years ago by a meteorite that was around 150 feet in diameter.
Allende Meteorite (Mexico, 1969) - The Allende Meteorite is one of the most studied meteorites in history and is considered to be one of the oldest known meteorites. It is also the largest carbonaceous chondrite ever found on Earth.
Hoba Meteorite (Namibia, Africa) - The Hoba Meteorite is the largest known meteorite ever found on Earth and is estimated to weigh around 66 tons. It has been declared a national monument in Namibia and is a popular tourist destination.
Well folks, looks like we've got some new neighbors. Apparently, a big hunk of space rock decided to pay Earth a visit and crash landed right in our backyard. I mean, talk about poor timing. Can you imagine if it had hit during rush hour? We would have had a real traffic jam on our hands. But in all seriousness, let's just hope it's not the beginning of the end and it's just some harmless space debris. Or maybe it's a sign from aliens that they're coming to take us away. Either way, let's just hope it's not a giant rock of doom sent to destroy us all. But hey, at least it'll make for a great conversation starter at parties.
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