According to some models, water was delivered to the inner Solar System by asteroids and comets during the Late Heavy Bombardment, which ended nearly 4 billion years ago. 

Some scientists believe that most of Earth’s water came from asteroids and comets that were thrown into the inner Solar System by the outer giant planets during the final stages of planet formation. 

While water is no longer present in meteorites, scientists can infer its existence from the presence of other elements. Studies of meteorites have found them to be surprisingly rich in water, suggesting that incoming asteroids delivered water and allowed Earth to become the habitable world we see today.

According to these models, water was delivered to the inner Solar System via comets and asteroids billions of years ago, a period known as the Late Heavy Bombardment. While water is no longer present in these meteorites, scientists can infer its existence from the presence of other elements

According to a study by National Geographic, the origin of Earth’s water may have been hundreds of millions of years earlier than previously thought, around 4.6 billion years ago. This would have been when the inner solar system was still forming. 

Mineralogical evidence from zircons suggests that liquid water and an atmosphere existed 4.404 billion years ago, shortly after the formation of Earth. This would have required the presence of an atmosphere. 

The earliest evidence of life on Earth dates back to around 3.5 billion years ago. The earliest life forms were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old. 

Some believe that life originated in the ocean, as sea water contained all the essential elements required for the origin of life. However, researchers face a paradox when trying to understand the origins of life on Earth. While water is an indispensable solvent for all known life forms, it also inhibits the formation of string-like chains of nucleic acid polymers such as RNA that were likely precursors of life

Earth’s water likely came from two main sources: volcanic activity and cometary impacts. 

Volcanic activity released water vapor and other gases from the Earth’s interior, which eventually condensed and formed the early oceans. 

The ocean formed billions of years ago. Water remained a gas until the Earth cooled below 212 degrees Fahrenheit. At this time, about 3.8 billion years ago, the water condensed into rain which filled the basins that we now know as our world ocean. 

The most favored explanation for where the Earth got its water is that it acquired it from water-rich objects (planetesimals) that made up a few percent of its building blocks. These water-rich planetesimals would have been either comets or asteroids. 

Some astronomers believe asteroids carried water to early Earth. New research suggests it may have come from even closer to home. Asteroids could have carried water, locked away in their minerals, to a young Earth, depositing it through impacts during our planet’s early years.

Yes, some scientists believe that most of Earth’s water came from space. 

About a decade ago, scientists discovered evidence that water is produced in the tiny dust grains on the surface of asteroids. This process is called space weathering, and it involves the interaction between hydrogen in solar wind and oxygen in minerals on the asteroids. 

NASA has also found water molecules in the Helix Nebula, a dying star. Water is a combination of hydrogen and oxygen, both of which are present in space

The Winchcombe meteorite is a carbonaceous chondrite that contains 11% extraterrestrial water and 2% carbon. Carbonaceous chondrites like the Allende Meteorite may have delivered much of Earth’s water. 

Researchers believe that some water may have arrived on meteorites, but how much is still debated. Some believe that water was likely delivered to Earth via unmelted, or chondritic, meteorites. Others say that as soon as meteorites melt, there is essentially no remaining water. 

According to a 2023 study published in Nature Astronomy, all of the water on the surface of Earth originally came from asteroid strikes

Some scientists believe that life on Earth may have been brought by an asteroid. The panspermia theory suggests that bacterial spores and plant seeds could have been transported to Earth by meteors. 

In 2019, the Japanese Space Agency’s Hayabusa2 spacecraft collected rocks from the asteroid Ryugu. Researchers found two organic compounds essential for living organisms on the asteroid. This discovery supports the idea that some ingredients for life may have arrived on Earth from space billions of years ago. 

The extraterrestrial or panspermia theories suggest that life existed in outer space and was transported to Earth by asteroids, meteorites, or comets. 

However, some say that it is extremely unlikely that a meteorite brought bacteria to Earth. Probes have been sent to asteroids and comets, and while they have found amino acids and other organic molecules, they have not found any microorganisms

Some scientists believe that life on Earth may have come from space. The panspermia theory suggests that life existed in space and was transported to Earth by asteroids, meteorites, or comets. 

According to a 2022 study, meteorites may have delivered the basis of life’s genetic code, DNA, to Earth. The study claimed that researchers found nucleobases in meteorites, which is the substance that makes the structure of DNA. 

Other scientists believe that meteorites splashed down and leached essential elements into warm ponds, which led to the origin of life on Earth

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