Do aliens exist? It's a question that continues to fascinate humans. This Teaching Wiki page explores research and discoveries related to the search for extraterrestrial life. You'll also find links to relevant resources for children, as well as previews of Twinkle Originals stories that are perfect for inspiring learning on aliens and space.
What are aliens?
Alien life, or extraterrestrial life, is hypothetical life that could possibly exist outside of Earth, and which did not originate on Earth. Alien life could range from simple forms of life, such as and archaea, to intelligent and even sapient beings. In theory, alien life could be more or less advanced than life on Earth. The science of extraterrestrial life is called astrobiology.
The Scientific Probability
- Trillions of Planets: The universe contains billions of galaxies, each with billions of stars. Modern astronomy shows that most stars have planets orbiting them, meaning there are trillions of worlds in the cosmos.
- The Habitable Zone: Many planets orbit in their star's "Goldilocks zone"—the sweet spot where temperatures are just right for liquid water to exist. Water is the key ingredient for life as we know it.
- Building Blocks Are Everywhere: Organic molecules and amino acids needed for life have been found in comets, asteroids, and dust clouds across space.
Promising Places in Our Solar System
- Mars: The Red Planet used to have liquid water and a thicker atmosphere billions of years ago, leaving open the possibility it once hosted simple microbial life.
- Icy Moons: Moons like Jupiter's moon Europa and Saturn's moon Enceladus have deep, liquid oceans hidden under thick shells of ice. They even have heat sources at the bottom from hydrothermal vents.
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