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Introduction. The word alien is a popular word for an extraterrestrial life-form, or a being from another planet. No one knows whether there is life elsewhere in the universe. But some scientists think that it is possible. (On Earth, “aliens” is also a word for people who are not citizens of the country in which they live.)
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- Aliens
alien. In law, an alien is a person who is not a citizen of...
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The meaning of ALIEN is belonging or relating to another person, place, or thing : strange. How to use alien in a sentence. Synonym Discussion of Alien.
definition 2: a living being from another planet; extraterrestrial. There is no evidence that aliens exist, but many people believe there is life on other planets.
- What Are Aliens?
- Do Aliens Exist?
- Do Aliens Exist? A Nasa-Funded Study That Hopes to Answer The Question
- What Is The Habitable Zone?
- What Is The Search For Extraterrestrial Life?
- What Is A Biosignature?
- What Is A Technosignature?
- What Is An Exoplanet?
- What Is An Astronomer?
- Five Experts State Whether They Believe Aliens Exist Or Not
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 bacteria 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 e...
Research that aims to discover extraterrestrial life has been ongoing since the mid-20th century, and the topic has been a point of interest in works of science fiction. To this day, no life outside of Earth has ever been found, and there's no evidence that alien life has ever visited or contacted our planet. However, developments in our understand...
In 1995, astrophysicists Michael Mayor and Didier Queloz discovered the first exoplanet. The vast, inhospitable world, known as 51 Pegasi b, was proof that planets orbited sun-like stars beyond our solar system, and challenged the dominant theory of planetary formation. 51 Pegasi b took just over four earth days to orbit its star, and it was hither...
The habitable zonerefers to the distance from a star at which water could exist on the surface of orbiting planets. These are called 'Goldilocks' zones', as they are planets where conditions may be just right for life.
The search for extraterrestrial life (SETI) is a general term that refers to scientific searches for intelligent extraterrestrial life. One example is monitoring electromagnetic radiation for signs of transmissions from civilisations from other planets,
A biosignatureis something that suggests the presence of a biological process that implies life. This can include things like a chemical compound, an isotope or a cellular component.
A technosignature, or technomarker, is a property or effect that provides scientific proof of past or present technology. One example of a technosignature would be radiation leakage.
All the planets in our solar system orbit the sun. Planets that orbit other stars are known as exoplanets.
An astronomeris a scientist whose area of study focuses on questions outside the scope of Earth. They study astronomical objects like stars, planets and moons, and their topics of study can include things like the origins of stars or the formation of galaxies.
Jonti Horner
Astrobiologist Jonti Horner thinks aliens exist, but wonders whether they're close enough for us to discover them. The sheer number of planets in our galaxy alone makes it seem unlikely that Earth is the only planet that harbours life. However, our galaxy is 100,000 light years from side to side, and the great distances between other potentially life-hosting planets would make it near impossible for us to hear alien signals - at least at the moment.
Steven Tingay
Astrophysicist Steven Tingay thinks aliens exist, but is clear to define the term 'alien' to mean all manner of life resident on places on other than Earth. This includes bacteria found somewhere other than our planet. Potential life could be primitive or advanced, while there's also the possibility that it plays by a completely different set of rules.
Helen Maynard-Casely
Planetary Scientist Helen Maynard-Casely believes it's a matter of time until we find something akin to biology somewhere other than on Earth. She cites the fact that we're finding more and more pockets in our solar system that may be hospitable to life as we understand it, such as the under oceans of two of Jupiter's large moons. Maynard-Casely also acknowledges that potential alien life may not conform to our "rules", and considers whether potential life can contact us as an entirely differ...
May 16, 2019 · DO ALIENS EXIST?: Mysteries of The Universe | LEARNING WITH SARAH | EDUCATIONAL VIDEOS FOR KIDS. Happy Learning English. 393K subscribers. Subscribed. 109. 38K views 4 years ago Learning with...
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Why is Roswell famous as the site of an alien encounter? What do experts say about these mysteries? Pupils will learn about how to use and review case studies, and critique evidence in our National Geographic Kids’ Alien investigation primary resource sheet.
