What are the challenges of distinguishing true biosignatures from false positives?

Jun 23, 2021 ... It is about 11 light-years away and is the second-closest system with an Earth-sized exoplanet (about 1.8 times the size of our planet). Any ... Sep 18, 2024 ... “Earth can regularly capture asteroids from the Near-Earth object (NEO) population and pull them into orbit, making them mini-moons,” ... Mar 11, 2025 ... ... planets circling around Barnard's Star, the second-nearest star system to Earth. The four planets, each only about 20 to 30% the mass of Earth ... Nov 16, 2017 ... Ross 128 b is the second closest known exo-Earth, after Proxima Centauri b (1.3 parsec), and the closest temperate planet known around a quiet star. Nov 14, 2018 ... The exoplanet orbits the red dwarf Barnard, the closest star to the Sun after the Alpha Centauri system. The team has used observations taken in ... Apr 17, 2024 ... Astronomers Discover a 'Sleeping Giant' Black Hole in Our Galaxy—the Second-Closest Known to Earth ... star some 1,926 light-years away. Nov 15, 2017 ... It is currently the second-closest temperate planet to Earth, after Proxima b. Every 9.9 days, Ross 128 b orbits a red dwarf star known as Ross ... Nov 15, 2017 ... At just 11 light-years away, it's the second closest exoplanet of its kind to Earth. But the closest one, known as Proxima b, looks to be ... Nov 14, 2018 ... A super-Earth planet orbiting the closest single star (and second-closest star system) to our own sun at only six light-years away, Barnard's Star. Nov 14, 2018 ... Barnard's star b is the second closest known exoplanet to our Sun. The closest lies just over four light-years from Earth and was also ...