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The Great Wall
Topic: Alien Life
What could an extraterrestrial observer see of human influence when looking at Earth from faraway? Anecdotally, many claimed that the Great Wall of China would be first glimpse of civilization from space. While the claim has validity from orbit, there are few footprints of advanced life beyond a hundred miles overhead.

Ancient Astronauts
Topic: Alien Life
Ben Bova writes in his new book, "Faint Echoes, Distant Stars" about the science and politics of finding life beyond Earth.

OVNIs, Abduções e Antigos Astronautas
Topic: Alien Life
Extraído do livro "Faint Echoes, Distant Stars: The Science and Politics of Finding Life Beyond Earth." (“Ecos Fracos, Estrelas Distantes: A Ciência e a Política de Encontrar vida Além da Terra” sem versão em português).

How Advanced Could They Be?
Topic: Alien Life
Renowed physicist, Dr. Michio Kaku, considers the physics of extra-terrestrial civilizations, and whether we can classify their evolution judging from our own work in progress.

Best Job in the World: Jill Tarter
Topic: Alien Life
The editors of TIME magazine have named astrobiologist and SETI researcher--Dr. Jill Tarter-- as one of the world's 100 most "influential and powerful people." The award is based on her lifelong study of search strategies for life elsewhere in the universe.

Can SETI Probe for Probes?
Topic: Alien Life
Just as our own robots reach out beyond the solar system, searching for life elsewhere may well involve hailing some kind of space artifact in our own neighborhood. At least one style of life search is about looking for the technological evidence of life, rather than its wet biology.

Ashes of the Phoenix
Topic: Alien Life
What had become the first systematic attempt to search for another world's intelligent radio communications has wound down. Project Phoenix will transition to more advanced search methods, but its pioneering status has become part of history.

Can Intelligent Life Thrive in Close Quarters?
Topic: Alien Life
Where should SETI researchers target their hunt for other intelligent species? The answer depends in large part on whether planets orbiting dim red-dwarf, or M-class, stars can provide suitable habitats for the evolution of intelligent life.

Questioning The Prime Directive
Topic: Alien Life
It has become somewhat accepted that an extrasolar contact could be interpreted as a good 'artificial' signal if it arose from certain branches of mathematics. If another galactic civilization decided to reach us, they would send a beacon of bleeps akin to the digits of 'pi' or only prime numbers.

Tapping the Grid: Interview with David Anderson
Topic: Alien Life
Project leader for the SETI@home program, Dr. David Anderson, talks about the history and challenges of running the world's largest virtual supercomputer. The project searches for anomalies in radio telescope data, as interesting indicators of what might be non-natural radio sources, or qualify as communication.

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