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Conditions on Early Earth

Conditions on Early Earth

Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.

The Colonization of Land

The Colonization of Land

Changes in the environment of the early Earth drove the evolution of organisms. As prokaryotic organisms in the oceans began to photosynthesize, they produced oxygen. Eventually, oxygen saturated the oceans and entered the air, resulting in an increase in atmospheric oxygen concentration, known as the oxygen revolution approximately 2.3 billion years ago. Therefore, organisms that could use oxygen for cellular respiration had an advantage. More than 1.5 years ago, eukaryotic cells and...

Conditions on Early Earth

Conditions on Early Earth

Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.

Eukaryotic Evolution

Eukaryotic Evolution

The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...

Origin of Cellular Life

Origin of Cellular Life

The origin of life on Earth is a complex and enigmatic event rooted in ancient biochemical processes and geological conditions. Experimental evidence supports the hypothesis that life began with the spontaneous formation of organic molecules such as RNA nucleotides, amino acids, and lipids under early Earth conditions. Factors like volcanic activity, intense UV radiation, and a reducing atmosphere without free oxygen likely facilitated these reactions. Hydrothermal vents on the ocean floor are...

Origin of Photosynthesis

Origin of Photosynthesis

Photosynthesis represents a fundamental biological process that transformed Earth's atmosphere and paved the way for complex life. Emerging roughly 3.4–3.8 billion years ago, the earliest photosynthetic organisms harnessed light energy to produce organic compounds. These anoxygenic phototrophs used electron donors like hydrogen sulfide (H₂S) or ferrous iron (Fe²⁺), rather than water, and did not release molecular oxygen (O₂) as a byproduct. Various groups, including green sulfur and purple...

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Related Experiment Video

Updated: Jun 28, 2026

Conducting Miller-Urey Experiments

Conducting Miller-Urey Experiments

Published on: January 21, 2014

Pre-biotic organic matter from comets and asteroids.

¹Department of Chemistry, University of Chicago, Illinois 60637-1433, USA.

|November 16, 1989

Summary

This summary is machine-generated.

Organic matter from space likely seeded early Earth, but only small meteors delivered it intact. Higher infall rates billions of years ago could have delivered significant organic carbon crucial for life's origin.

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Last Updated: Jun 28, 2026

Conducting Miller-Urey Experiments

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Published on: January 21, 2014

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Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment

Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment

Published on: February 27, 2021

Area of Science:

Astrobiology
Geochemistry
Planetary Science

Background:

The origin of life on Earth is hypothesized to involve extraterrestrial organic matter delivery.
High-temperature impacts typically destroy organic molecules, posing a challenge to this theory.

Purpose of the Study:

To assess the viability of extraterrestrial organic matter delivery to early Earth.
To quantify the amount of intact organic carbon delivered by meteoritic matter.

Main Methods:

Analysis of impact survival conditions for organic matter.
Estimation of organic carbon accumulation based on meteoritic infall rates over geological time.

Main Results:

Only small meteorites (10^-12 to 10^-6 g) can survive atmospheric entry and deliver intact organic matter.
Estimated accumulation of intact organic carbon on early Earth was approximately 20 g cm^-2 during a specific period.

Conclusions:

Soft landing of organic matter via small meteors is a plausible mechanism for seeding early Earth.
This delivery could have provided biologically significant compounds not synthesized abiotically on Earth.