April 22, 2016 Volume 22, Number 16 |
Research and Education |
General Interest |
Network Tools |
In the News |
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New Thoughts on the 'Goldilocks' Zone | |
How alien can a planet be and still support life? Star's Wobble Could Reveal 'Earth-Like' Exoplanet What is the Goldilocks Zone and why does it matter in the search for ET? The Search for Extraterrestrial Life: A Brief History NASA Astro Venture: Astronomy Training Lessons: Habitable Zone Reading NAAP Habitable Zones Lab In the autumn of 1959, the space age was just beginning. Both the USSR and the United States had launched successful space satellites. Both were gearing up for manned space flight. Anything seemed possible. It was in this context that Cornell University physicists Giuseppe Cocconi and Philip Morrison published their groundbreaking two-page paper in Nature, in which they wondered, first, whether advanced civilizations might exist on other planets, and, second, whether we might be able to receive signals from them. The paper is often haled as the first deliberate example of scientific thinking about extraterrestrial life. Thousands of papers followed, in which astronomers contemplated the elements necessary to sustain life as we know it, including water, appropriate temperatures, and other factors. This line of thinking culminated in broad agreement about what scientists now call "The Goldilocks Zone," the habitable zone around a sun-like star that a planet would need to occupy in order to sustain life. Astronomers now estimate that there are literally billions of Earth-size planets orbiting sun-like stars at appropriate distances to sustain life - and that's just in our galaxy. So while we have yet to receive signals from an alien civilization, it seems increasingly probable that there is intelligent life somewhere else in the universe. [CNH] The first link takes readers to an article in Science News, where Earth sciences reporter, Thomas Sumner, wonders how alien a planet can be and still support life. Next, Discovery News reports on a potentially habitable exoplanet about 16 light years from Earth. Readers may turn next to an article from ABC News, in which senior journalist Stuart Grey explains what exactly the "Goldilocks Zone" is and why it matters in the search for extraterrestrial life. The fourth link provides a brief history of the search for extraterrestrial life from Popular Science. Next up, a PDF from NASA explains further the intricacies of scientific thinking on the habitable zone, including what it is, where it is, and how it functions. Finally, the Astronomy Education department at the University of Nebraska-Lincoln offers a Habitable Zones Lab, in which students may explore the basic conditions necessary for life to exist through a fascinating online simulator. |