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Searching for Alien Artifacts on the Moon
Topic: Alien Life
Summary: Two researchers have suggested that high-resolution images from the Lunar Reconnaissance Orbiter should be examined for anomalies that could be evidence of alien artifacts on the Moon.

Why Silicon Aliens Would Rather Eat Our Cities Than Us
Topic: Alien Life
Summary: Bruce Dorminey, science journalist and author of "Distant Wanderers: The Search for Planets Beyond the Solar System," interviews NASA astrochemist Max Bernstein about the possibility of Silicon-based life.

Porque Alienígenas de Silício Iriam Preferir Comer Nossas Cidades a Nós
Topic: Alien Life
Summary:  Bruce Dorminey, um jornalista científico e autor de "Distant Wanderers: The Search for Planets Beyond the Solar System" ("Maravilhas Distantes: A Procura por Planetas Além do Sistema Solar" livro ainda sem tradução para o português) entrevista o astroquímico da NASA Max Bernstein sobre a possibilidade de vida baseada em silício.

SETI Targets Kepler Planets
Topic: Alien Life
Summary: The Allen Telescope Array (ATA) is once again searching for signals of extraterrestrial intelligence. New targets for ATA will include exoplanet candidates discovered by NASA's Kepler space telescope.

How to Respond When E.T. Says Hello
Topic: Alien Life
Summary: Scientists are studying the best ways to compose messages meant for alien eyes in case we ever do get the chance to communicate with extraterrestrials.

Habitable Does not Mean 'Earth-Like'
Topic: Alien Life
Summary: Although the number of exoplanets discovered is reaching the thousands, few are "Earth-like" in terms of their suitability for life as we know it. A team of scientists is now proposing a new system for classifying exoplanets to help identify planets that are theoretically conducive to life in less earthlike conditions.

Extraterrestrial Sprites
Topic: Alien Life
Summary: New research shows that the occurrence of "sprites" in the Earth's atmosphere is not a phenomenon limited to our planet. These offshoots of electric discharges are caused by lightning storms. Studying lightning on other planets could help astrobiologists determine their potential to support life.

Seeking Alien Artifacts in the Solar System
Topic: Alien Life
Summary: Probes like Pioneer and Voyager are heading out into the galaxy carrying plaques about humankind. Why have we never found similar evidence of other civilizations? A new mathematical study suggests that we may not be looking hard enough.

Procurando por Artefatos Alienígenas no Sistema Solar
Topic: Alien Life
Summary: Sondas como a Pioneer (Pioneira) e Voyager (Viajante) estão viajando pela galáxia carregando placas sobre a humanidade. Por que nós nunca encontramos evidência similar de outras civilizações? Um novo estudo matemático sugere que nós podemos não estar procurando o suficiente.

The Methane Habitable Zone
Topic: Alien Life
Summary: In the search for life elsewhere, many studies focus on finding liquid water. But what if life could exist with some other solvent? Saturn´s smoggy moon Titan makes scientists question the possibilities for methane-based life in the galaxy.

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