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A recent search for alien transmissions in the TRAPPIST-1 system, which consists of seven Earth-sized planets orbiting a red dwarf star, has yielded no results. The planets in this system are located in the star's habitable zone, making them potential candidates for hosting life. Researchers used the planets' close orbits to look for radio signals that might indicate interplanetary communication, but no signals were detected. While it is still possible that aliens could be using weaker instruments or communicating at different times, the search in the TRAPPIST-1 system has not provided any evidence of extraterrestrial life. [Extracted from the article]

Space A LARGE proportion of planets in the so-called habitable zone - the area around a star where conditions are right for liquid water on an orbiting world's surface, and thus potentially for life - weren't always there. Planets in the "habitable zone" may not be good for life We don't know much about how life arose on Earth, so our understanding of the conditions necessary for life are vague, but it is clear that belatedly habitable planets have more obstacles for life than continuously habitable ones. [Extracted from the article]

The article discusses the presence of water on Earth and in other bodies of the solar system, the evolution of life, and the possibility of life on other planets and moons. Topics include how water on Earth made life possible and how microbial life eventually modified the atmosphere to be more habitable, past water on Mars and Venus, the presence of subsurface oceans on Saturn's moons Titan and Enceladus, and conditions that would make life possible in the habitable zone of other star systems.

The article discusses the search for exoplanets capable of sustaining life, focusing on the assertion that such a planet may be very different from Earth. Topics include the concept of a habitable or "Goldilocks" zone for planets based on assumptions of carbon based life and the necessity of liquid water, the characteristics of planets discovered by the Kepler space telescope, and the implications of findings of subsurface life on Earth on concepts of potential extraterrestrial life.

The article focuses on research examining the conditions exoplanets need to possess in order to be habitable. It states over 4,000 exoplanets have been discovered in orbit around distant stars. It mentions the habitable zone of a star where water is a liquid and talks about the need for ultraviolet (UV) radiation to help create complex compounds needed for life. It explains the concept of the abiogenesis zone where planets are not sterilized by UV light but have enough for prebiotic chemistry.

The article offers science news briefs on topics such as allegations that North Korea can build uranium enrichment centrifuges for nuclear weapons, shellfish population declines due to coral reef collapse, and an interactive map of stars with the potential to host habitable planets.