Articles tagged with Habitable Planets
The study found that airborne dust can cool down the hotter dayside but also warm the night side, effectively widening the planet's habitable zone. This process is a negative climate feedback, postponing the loss of water and making the planet more habitable.
Astronomers have measured the stellar obliquity of TRAPPIST-1, a very low-mass star, and found it to be low and close to zero. This is the first detection of this effect for an exoplanet system with Earth-like planets, suggesting that planetary orbits may not be misaligned with star rotation.
A Southwest Research Institute scientist modeled Mars' atmosphere to determine that salty pockets of water on the Red Planet are unlikely to be habitable by Earth-based life. The study found stable brines could form seasonally, but temperatures are too low to support life.
A new study by University of Arkansas astrophysicist Daniel Whitmire contradicts a previous theory that giant elliptical galaxies are more likely to host technological civilizations. The study suggests that galaxies like the Milky Way, where most stars and planets reside, are more likely to harbor intelligent life.
Astronomers will use transmission spectroscopy and phase curves to observe the atmospheres of seven rocky planets in the TRAPPIST-1 system. The goal is to determine if these planets have atmospheres and what they're made of, which could help find out if life as we know it could survive on these distant worlds.
A 'cold Neptune' and two temperate super-Earths, GJ180d and GJ229Ac, have been discovered orbiting nearby red dwarf stars, offering a chance to study potentially habitable worlds. The planets were found using the radial velocity method and offer insights into exoplanet formation and evolution.
NASA's Transiting Exoplanet Survey Satellite (TESS) has discovered its first Earth-size planet in its star's habitable zone, TOI 700 d. The planet orbits a small, cool M dwarf star located just over 100 light-years away and is thought to be rocky with surface temperatures suitable for liquid water.
A new study suggests Earth's oxygenation was driven by internal biogeochemical feedbacks involving phosphorus, carbon, and oxygen cycles. This theory produced the same three-step pattern as the geological record without requiring biological advances beyond simple cyanobacteria.
A Northwestern University study combines 3D climate modeling with chemistry to explore the habitability of planets around M dwarf stars. The research finds that only planets orbiting active stars lose significant water to vaporization, making them less likely to sustain life.
A colossal collision between Jupiter and a still-forming planet may have stirred up the core, altering its density and composition. Researchers suggest this event could explain Juno's puzzling gravitational readings, which indicate a less dense and more extended core than expected.
A new study provides the most accurate estimate of the frequency that planets similar to Earth occur around sun-like stars, which will be important for designing future astronomical missions. The researchers' novel approach allows them to account for several effects not included in previous studies.
The discovery of TOI-270 includes two sub-Neptunes that could be an intermediate size between Earth and Neptune, providing insights into planetary formation. Astronomers also found a rocky super-Earth with a three-day orbit, adding to the system's potential for studying exoplanet dynamics.
Researchers found that gravitational forces of an unseen moon outside the rings could cause gaps in the ring structure, but the effect is unlikely to be caused by a currently unseen moon.
A team of scientists from Carnegie Institution argues that a planet's interior dynamics are vital for creating a hospitable environment. The researchers suggest that planetary composition and interior processes should be considered when searching for signs of life on exoplanets.
Recent studies suggest that high-energy particles from TRAPPIST-1's star could break apart complex molecules needed for life, while tidal forces may raise temperatures and drive volcanic activity on planets. This challenges the habitability of TRAPPIST-1 exoplanets.
The Cornell University-led study identifies 1,822 stars with conditions suitable for finding Earth-like planets and life-supporting environments. These stars are within reach of NASA's James Webb Space Telescope for atmospheric analysis and the detection of signs of life.
A new study finds that K stars, which are dimmer than the Sun but brighter than faintest stars, may be particularly promising targets for searching for signs of life. K stars live a long time and have less extreme activity in their youth, giving them plenty of time for life to evolve.
Astronomers from UCI and other institutions have successfully used the Habitable Planet Finder to discover and confirm the existence of exoplanets. The new technique has been demonstrated on a recently discovered super-Earth orbiting Barnard's star, expanding the selection of stellar targets for exoplanet hunting.
The Habitable Zone Planet Finder enables precise measurement of a star's radial velocity, allowing detection of planets capable of having liquid water on their surfaces. The instrument uses near-infrared light to observe low-mass planets around cool nearby M dwarf stars in Habitable Zones.
The protection of extraterrestrial life is not stipulated in international space research agreements. However, launching miniature interstellar probes poses a risk to habitable but sterile oxygen planets. Research suggests that these planets are unlikely to support life due to the corrosive effect of free oxygen.
A new study challenges the idea that life requires an 'Earth clone' by finding that water worlds could be habitable for a significant percentage of simulated planets. Researchers used over 1,000 simulations to find that 10% of planets stay stable for more than a billion years without geochemical cycling.
Researchers have developed a new IR instrument to search for potentially habitable planets around small red dwarf stars. The instrument, IRD, uses advanced technology to measure the line-of-sight movement of stars and detect planets with high accuracy.
The UCR team's guidebook outlines three types of biosignatures that astrobiologists have proposed as markers for life on other planets. The review articles provide a comprehensive framework for scientists searching for signs of life, called biosignatures, in the data they collect from future telescope observations.
Astronomers found that planets in the habitable zone can abruptly freeze due to large obliquity variations or eccentricity changes, making a fraction of them uninhabitable. The study uses sophisticated ice sheet modeling and suggests orbital dynamics play a significant role in habitability.
A team of UCSB physicists has created a device named DARKNESS, the first 10,000-pixel integral field spectrograph designed to overcome the limitations of traditional semiconductor detectors. This instrument enables direct imaging of planets around nearby stars and can detect fainter planets with higher contrast ratios.
Astronomers found intense X-ray radiation from red dwarf stars can strip away a planet's ozone layer, making it uninhabitable. This means that life on land might only survive in the oceans.
The TRAPPIST-1 planets are curiously light, suggesting the presence of water instead of atmospheric gases. The team found that the inner planets have less than 15% water by mass, while the outer planets have more than 50%.
The study rules out a cloud-free hydrogen-rich atmosphere for three planets, but leaves open the possibility for planet TRAPPIST-1g. The observations provide key insights into the potential habitability of these planets, paving the way for future studies with the James Webb Space Telescope.
The Star-Planet Activity Research CubeSat (SPARCS) mission aims to monitor the flares and sunspots of small, cool stars, known as M dwarfs, to assess their habitability for planets. The spacecraft will use ultraviolet-sensitive detectors to study how stellar activity affects planetary environments.
Researchers found small, Earth-like planets in Alpha Centauri that may have been overlooked and eliminated the possibility of large Jupiter-sized planets. The study uses advanced spectrographic instruments to narrow the search for habitable planets in our closest neighboring system.
Scientists from NASA and universities are investigating exoplanets to determine their habitability, focusing on astrophysics, Earth science, heliophysics, and planetary science. Researchers use tools like DSCOVR's high-resolution images to simulate habitable planets and study the interaction between stars and planets.
The MAVEN mission helps answer the question of how long a rocky planet might be habitable by orbiting a red dwarf star. Based on Mars' atmospheric loss data, researchers estimated that such a planet's atmosphere could lose charged particles and neutral particles at significantly higher rates.
Researchers found that the moon's magnetic field declined by about 90 percent over 3.56 billion years ago, with a 1-2.5 billion year time frame for its existence. This discovery has implications for habitability on other moons and planets, as well as the potential for life to respond to unstable environments.
A team of astronomers advocates for a statistical comparative approach to find habitable planets and life beyond the solar system. By studying large numbers of exoplanets with less detailed measurements, they can estimate the frequency of habitable environments and life on those planets.
A University of Oklahoma researcher has identified the possible compositions of seven planets in the TRAPPIST-1 system, finding six to be Earth-like. The exception, TRAPPIST-1f, has a high water content, suggesting TRAPPIST-1e as a potential candidate for habitability studies.
A new study suggests that volcanic hydrogen can warm planets, making them more likely to harbor life. With this discovery, distant stars could expand their habitable zones by 30-60%, adding many previously icy worlds to the list of potential candidates for hosting life.
The Wolf 1061 system is a promising target in the search for extraterrestrial life due to its proximity to Earth and the presence of a habitable zone. The team's findings suggest that one of the planets, Wolf 1061c, may have an atmosphere similar to Venus, which could lead to a runaway greenhouse effect.
Proxima Centauri, a small red dwarf star, has a regular cycle of starspots similar to our Sun. The study suggests that this cycle may impact the potential habitability of its planet, Proxima b.
Astronomers have found a potentially habitable exoplanet, Proxima b, orbiting the red dwarf star Proxima Centauri, just 11 days from its parent star. The planet's mass is at least 1.3 times that of Earth and orbits within the star's habitable zone.
Researchers from KU Leuven show that surface composition and atmosphere interaction on exoplanets affect their temperature and habitability. A well-functioning 'air conditioning' system can make even planets with permanent day and night sides potentially habitable.
Researchers have discovered a super-fast rotating, ultra-cool brown-dwarf star, measuring its rotational period with bursts of radio waves detected by the Arecibo telescope. This groundbreaking detection reveals new insights into the internal dynamics and magnetic field generation in these objects.
Astronomers at NASA's Goddard Space Flight Center and San Diego State University have discovered a new planet, Kepler-1647b, which orbits two stars and is the largest transiting circumbinary planet ever found. The planet, with a mass and radius similar to that of Jupiter, takes 3 years to orbit its host stars.
Researchers found that Kepler-62f could sustain life with an atmosphere 3-5 times thicker than Earth's composed entirely of carbon dioxide. The team also ran simulations on different orbital configurations, finding multiple scenarios that allow the planet to be habitable.
Recent studies suggest that many planets orbiting M dwarf stars, which are similar in size to Earth, may retain thick atmospheres due to their strong gravity, making them inhospitable to life. However, smaller planets comparable to Venus or Mars could potentially lose these atmospheres through evaporation.
Researchers find that planets in the red giant habitable zone can stay warm for up to half a billion years, potentially allowing life to thrive. This discovery offers optimism for the chances of life existing on worlds orbiting older stars.
An international team of astronomers has discovered three Earth-sized planets orbiting a nearby ultracool dwarf star, TRAPPIST-1. The planets are located within the star's habitable zone and may have conditions suitable for life.
A new paper uses exoplanet discoveries to estimate the probability of advanced life evolving on habitable planets. The authors find that unless the odds are extremely low, humanity is likely not the universe's first technological civilization. They calculate a 'pessimism line' below which human uniqueness would be impossible.
A new study of the young, Sun-like star Kappa Ceti found that a magnetic field played a key role in making a planet conducive to life. The presence of such a field helped shield the atmosphere from intense stellar winds and superflares.
A new theory suggests that life on other planets would become extinct quickly due to unstable planetary environments. The Gaian Bottleneck model proposes that most fossils in the universe are from extinct microbial life, not complex species like dinosaurs or humans.
Researchers argue that globular clusters can host planets with conditions suitable for life, despite initial concerns. The environment of these dense star clusters may allow for stable planetary systems to form and survive for billions of years.
Astronomers at the University of New South Wales have discovered three potentially habitable planets around a nearby red dwarf star called Wolf 1061. The middle planet, Wolf 1061c, is located within the Goldilocks zone and may be able to support liquid water and life.
A new theoretical study suggests that only eight percent of potentially habitable planets will ever form in the universe, while the bulk of those planets - 92 percent - have yet to be born. This conclusion is based on an assessment of data collected by NASA's Hubble Space Telescope and the Kepler space observatory.
Astronomers create a new metric, the 'habitability index,' to prioritize exoplanets for search of life. The index takes into account planetary rockiness and eccentricity-albedo degeneracy, ranking planets with liquid water potential.
Scientists from KU Leuven discovered that two of three possible climates on rocky exoplanets are potentially habitable. The 'air conditioning system' keeps surface temperatures within the habitable range, despite permanent day and night sides. This finding provides valuable input for future space missions.
A new theory proposes that a planet's bulk composition, specifically the abundance of uranium, thorium, and potassium, dictates whether plate tectonics can occur. This affects the planet's internal heating, volcanism, and climate. The Earth's unique composition allows for current plate tectonics to operate.
A team of researchers from Arizona State University found that Tau Ceti, a popular candidate for supporting life, is unlikely to have planets in the habitable zone. The star's high magnesium-to-silicon ratio could lead to unique planetary compositions and potentially habitable worlds with different geological processes.
Researchers used the Titius-Bode law to calculate planetary positions and found billions of stars with 1-3 planets in their habitable zone. This suggests that a significant number of these planets could have liquid water and support life.
Researchers from Queen Mary University of London and University of Hertfordshire re-evaluate data and find signal of GJ 581d to be real. The method used in the initial study was inadequate for detecting small planets, leading to a possible misidentification.
Astronomers found that tidal forces and atmospheric escape can transform mini-Neptune-like worlds into gas-free, potentially habitable planets. This process could provide a pathway to the formation of habitable worlds around M dwarf stars.
Astronomers have discovered a star with three planets only slightly larger than Earth, one of which orbits in the habitable zone where surface temperatures could be moderate enough for liquid water and life to exist. The study found that these planets are about 2.1, 1.7, and 1.5 times the size of Earth.