What is the most common element in the universe?


The Elemental Abundance: Unveiling the Most Common Element in the Universe

As a celebrated columnist, science communicator, and professor, I am passionate about sharing the wonders of science with readers like you. Today, we’ll explore a fascinating question that might pique your curiosity: What is the most common element in the universe? The answer to this cosmic riddle is none other than the lightweight champion, hydrogen.

Hydrogen: The Cosmic Cornerstone

It is the most abundant element in the universe, forming the building blocks for countless celestial phenomena. Here’s what makes it truly remarkable:

  • Elemental Simplicity: It consists of a single proton and electron, making it the simplest element in existence.
  • Universal Abundance: It accounts for about 75% of the universe’s elemental mass, according to astronomical observations.

Hydrogen Cosmic Influence: Stars and Galaxies

It plays a crucial role in the life cycle of stars and the formation of galaxies:

  • Stellar Birth: Hydrogen gas clouds, under gravity’s influence, collapse and ignite to form new stars.
  • Nuclear Fusion: In a star’s core, hydrogen atoms fuse to create helium, releasing energy as light and heat.

Hydrogen on Earth: Practical Applications and Energy Potential

Although it is less abundant on Earth than in the cosmos, it has significant applications and potential for future energy needs:

  • Industrial Use: It is used in the production of ammonia, refining metals, and creating fuel cells.
  • Sustainable Energy: Hydrogen fuel cells hold promise for clean, renewable energy, emitting only water vapor as a byproduct.


In conclusion, hydrogen reigns supreme as the most common element in the universe, playing an integral role in the formation of stars and galaxies. On Earth, this simple yet vital element offers a range of applications, from industrial processes to sustainable energy solutions. As we continue to explore the universe and harness the power of hydrogen, we come to appreciate the profound impact of this seemingly modest element on our cosmic journey.


Here are a few websites that provide information about it, its properties, and its importance:

  1. Royal Society of Chemistry
  2. Live Science
  3. Chemicool
  4. NASA
  5. U.S. Department of Energy (Office of Energy Efficiency & Renewable Energy)
  6. National Geographic

These websites cover various aspects of it, including its properties, applications, importance in the universe, and potential use in sustainable energy solutions.

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