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☆ NASA scientists think some planets are shrinking because powerful radiation from their cores is pushing away their atmospheres
▼ + stars: | 2023-11-17 | by ( Sebastian Cahill | Morgan Mcfall-Johnsen | ) www.businessinsider.com time to read: +4 min

Planets beyond our solar system have a size gap, where worlds seem to shrink past a certain range. Scientists think this is because some sub-Neptunes shrink — losing their atmospheres and speeding through the size gap until they are as small as a super-Earth. AdvertisementThe planets themselves may be pushing their atmospheres awayShrinking exoplanets may lack the mass (and therefore the gravity) to hold their atmospheres close. AdvertisementThe other hypothesis, called photoevaporation, says that a planet's atmosphere is dissipated by the radiation of its host star. AdvertisementThe scientists found that most of the planets there retained their atmosphere, making the core-powered mass loss a more likely cause of eventual atmosphere loss.

Persons: —, Jessie Christiansen, Mark Garlick, NASA's, Christiansen Organizations: NASA, Service, JPL, Caltech, Kepler Space, Harvard

☆ Our Galaxy Is Home to Trillions of Worlds Gone Rogue
▼ + stars: | 2023-08-06 | by ( Katrina Miller | More About Katrina Miller | ) www.nytimes.com time to read: +1 min

They probably form the same way other planets do: within the swirling disk of gas and dust surrounding an infant star. But unlike their planetary siblings, these worlds get violently chucked out of their celestial neighborhoods. Astronomers had once calculated that billions of planets had gone rogue in the Milky Way. Now, scientists at NASA and Osaka University in Japan are upping the estimate to trillions. The existence of wandering worlds orphaned from their star systems has long been known, but poorly understood.

Persons: — Organizations: NASA, Osaka University Locations: Japan

☆ A planet’s atmosphere is blasted away by a star and Hubble captures it
▼ + stars: | 2023-07-31 | by ( Ashley Strickland | ) edition.cnn.com time to read: +5 min

CNN —The Hubble Space Telescope captured an unexpected observation of a nearby planet that’s having its atmosphere blasted away by energetic outbursts from its star. As the planet is blasted by radiation, its atmosphere heats to the point that it escapes the planet’s gravity and puffs out into space. The planet gets hit with flares, X-rays and stellar wind, or a charged stream of particles released from the star. “This creates a really unconstrained and frankly, scary, stellar wind environment that’s impacting the planet’s atmosphere,” Rockcliffe said. Astronomers will conduct more follow-up observations of the system with Hubble to track how the planet changes in the future.

Persons: Hubble, NASA’s, “ We’ve, ”, Keighley Rockcliffe, “, ’, ” Rockliffe, ” Rockcliffe, Rockcliffe Organizations: CNN, Hubble, Spitzer, Telescope, Keighley, Dartmouth College Locations: Hanover , New Hampshire

☆ NASA’s new telescope could spot thousands of exoplanets and hundreds of Earth-size rogue planets
▼ + stars: | 2023-07-27 | by ( Ashley Strickland | ) edition.cnn.com time to read: +8 min

CNN —When NASA’s next-generation space observatory launches in a few years, the Nancy Grace Roman Space Telescope will expand the search for exoplanets as well as rogue planets, or worlds that travel through space without orbiting stars. Understanding these rogue planets could shed more light on the formation, evolution and disruption of planetary systems. This illustration shows what the Nancy Grace Roman Space Telescope will look like in orbit. But rogue planets are likely much smaller. Telescopes like Hubble and the James Webb Space Telescope have enabled astronomers to observe large, glowing gas giant exoplanets called hot Jupiters.

Persons: NASA’s, Nancy Grace, Nancy Grace Roman, NASA's, —, ”, David Bennett, Microlensing, Takahiro Sumi, “, Naoki Koshimoto, ” Sumi, Hubble, Vanessa Bailey, Roman’s, James Webb, Bailey, coronagraph, “ It’s, ” Bailey Organizations: CNN, Hubble, NASA's Goddard Space, Mount John University Observatory, Goddard Space Flight, Osaka University, Engineers, Jet Propulsion Laboratory Locations: New, Greenbelt , Maryland, Pasadena , California, Webb

☆ Scientists expand search for signs of intelligent alien life
▼ + stars: | 2023-05-31 | by ( Will Dunham | ) www.reuters.com time to read: +4 min

Efforts to detect alien technological signatures previously have focused on a narrowband radio signal type concentrated in a limited frequency range or on single unusual transmissions. The search involves a frequency range covering a bit less than a tenth the width of an average FM radio station. "Aliens may possibly use such beacons for galaxy-wide communications, for which the core of the Milky Way is ideally placed. The scientists in the various monitoring efforts passively scan for signals of alien beings and do not actively send their own signals advertising our presence on Earth. "In my personal opinion, as a relatively young species in the grand cosmic scale, it would be prudent for us to focus on listening and investigating before embarking on deliberate transmissions," Gajjar said.

Persons: Akshay Suresh, Suresh, Vishal Gajjar, Gajjar, BLIPSS, Will Dunham, Rosalba O'Brien Organizations: Cornell University, Cornell, SETI Institute, SETI Institute and University of California, Thomson Locations: Berkeley, West Virginia

☆ Dazzling galactic diamonds shine in new Webb telescope image
▼ + stars: | 2022-12-14 | by ( Ashley Strickland | ) edition.cnn.com time to read: +4 min

CNN —The James Webb Space Telescope has captured a unique perspective of the universe, including never-before-seen galaxies that glitter like diamonds in the cosmos. “I was blown away by the first PEARLS images,” said study coauthor Rolf Jansen, research scientist at Arizona State University and a PEARLS coinvestigator, in a statement. Together, the wavelengths of light from both telescopes reveal unprecedented depth and detail of a wealth of galaxies in the universe. The image represents just a portion of the full PEARLS field, which will be about four times larger. Other pinpricks of light in the image represent a range of stars in our Milky Way galaxy.

☆ 'Planet killer' asteroid hidden by the sun may threaten Earth in a few thousand years
▼ + stars: | 2022-11-01 | by ( Morgan Mcfall-Johnsen | ) www.businessinsider.com time to read: +5 min

Astronomers discovered a "planet killer" asteroid that may pose a threat to Earth in future millennia. That makes it a "planet killer," Scott S. Sheppard, an astronomer at the Carnegie Institution for Science, said in a press release announcing the discovery on Monday. But there could be other planet killer asteroids lurking unseen in the blind spot where 2022 AP7 was discovered: within the orbits of Earth and Venus, between us and the sun. That makes it very difficult to spot asteroids located between Earth and the sun. "There are likely only a few [near-Earth asteroids] with similar sizes left to find," Sheppard said in the release.

☆ O nouă planetă descoperită de cercetători are o temperatură apropiată de cea a Pământului și ar putea avea nori asemănători
▼ + stars: | 2021-06-13 | by ( ) www.jurnal.md time to read: +3 min

Această exoplanetă, numită TOI-1231 b, face o orbită completă în jurul stelei sale la fiecare 24 de zile de pe Pământ. „Cu toate acestea, planeta în sine este mai mare decât Pământul și puțin mai mică decât Neptun”, a adăugat ea. „TOI1231b ar putea avea o atmosferă cu mult hidrogen sau hidrogen-heliu sau o atmosferă mai densă de vapori de apă. Cercetătorii consideră că TOI-1231 b are o temperatură medie de 60 grade Celsius, fiind astfel una dintre cele mai „răcoroase” exoplanete mici descoperite până acum. Webb va avea capacitatea de a privi în atmosferele exoplanetelor și de a ajuta la determinarea compoziției acestora.

Persons: Pământ, Exoplaneta, Diana Dragomir, Jennifer Burt, Dragomir, Burt, James Webb, . Webb, Hubble Organizations: CNN, Astronomical Journal, Universității din, Neptun, Jet, K2 Locations: Universității din New Mexico, Neptun, Pasadena, California

☆ Сколько потенциально обитаемых планет существует в нашей галактике
▼ + stars: | 2020-11-15 | by ( Mld Media Srl | ) noi.md time to read: +1 min

В галактике Млечный Путь насчитывается около 300 млн планет, похожих на Землю по размеру и другим физическим параметрам. Исследователи обобщили все доступные данные о частоте планет, встречающихся в нашей галактике, передает regnum.ru. Общее исследование показало, что в Млечном Пути насчитывается до 300 млн потенциально обитаемых планет. «Собранные «Кеплером» данные показали, что существуют миллиарды экзопланет. Но мы впервые показали распространённость подобных планет с такой высокой точностью», — прокомментировал ведущий автор исследования Стив Брайсон из Исследовательский центр Эймса американского аэрокосмического агентства NASA.

Persons: Стив Брайсон Organizations: NASA, Кеплер, Исследовательский центр Эймса американского аэрокосмического агентства Locations: Млечный Путь, Земля, Млечное Путь

☆ NASA: Calea Lactee are cel puțin 300 de milioane de planete potențial locuibile
▼ + stars: | 2020-11-08 | by ( ) www.realitatea.md time to read: +4 min

Galaxia noastră este plină de planete potențial locuibile - cel puțin 300 de milioane, potrivit NASA, scrie CNN. Cu toate acestea, întrebarea principală a misiunii inițiale a rămas: câte dintre aceste planete sunt locuibile? Condițiile pentru a susține viațaÎn Calea Lactee există între 100-400 de miliarde de stele, conform estimărilor NASA. „Zona Goldilocks”O planetă locuibilă trebuie să se afle în zona „tocmai potrivită”, sau așa-numita zonă Goldilocks, pentru a susține apa lichidă la suprafața sa. În prezent, misiunea TESS a NASA este cel mai recent „vânător de planete” care caută exoplanete.

Persons: NASA, Kepler, Steve Bryson, TESS Organizations: NASA, CNN, The Astronomical Journal, Agenției Spațiale Locations: Brazilia, Danemarca

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