![]() The rise of oxygen in Earth’s early ocean and atmosphere. First SETI observations with China’s Five-hundred-meter Aperture Spherical Radio Telescope (FAST). The breakthrough listen search for intelligent life: a 3.95–8.00 GHz search for radio technosignatures in the restricted Earth transit zone. The luminosity and mass functions of low-mass stars in the galactic disk II. Exploring the age-dependent properties of M and L dwarfs using Gaia and SDSS. ![]() Summary of the contents and survey properties. Which stars can see Earth as a transiting exoplanet? Mon. The search for extraterrestrial intelligence in Earth’s solar transit zone. in Bioastronomy: The Search for Extraterrestial Life - The Exploration Broadens 254–258 (Springer, 2008). A Scheme for Targeting Optical SETI Observations. We found that human-made radio waves have already swept over 75 of the closest stars on our list. Among these stars are seven known exoplanet hosts, including Ross-128, which saw Earth transit the Sun in the past, and Teegarden’s Star and Trappist-1, which will start to see it in 29 and 1,642 years, respectively. ![]() Here we report that 1,715 stars within 100 parsecs from the Sun are in the right position to have spotted life on a transiting Earth since early human civilization (about 5,000 years ago), with an additional 319 stars entering this special vantage point in the next 5,000 years. However, these studies considered only the current position of stars, and did not include their changing vantage point over time. Previous work has explored the zone from which Earth would be visible while transiting the Sun 1, 2, 3, 4. ![]() With thousands already detected, our search is entering a new era of discovery with upcoming large telescopes that will look for signs of ‘life’ in the atmospheres of transiting worlds. In the search for life in the cosmos, transiting exoplanets are currently our best targets. ![]()
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