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☆ Earth is about to have a temporary ‘mini-moon’
▼ + stars: | 2024-09-20 | by ( Ashley Strickland | ) edition.cnn.com time to read: +6 min

But as a mini-moon, Asteroid 2024 PT5 isn’t in any danger of colliding with Earth now or over the next few decades, de la Fuente Marcos said. Asteroid 2020 CD3 is considered a long-capture mini-moon, while the newly detected Asteroid 2024 PT5 is a short-capture one. Short mini-moon events can occur several times per decade, but long mini-moon events are rare, and only occur every 10 or 20 years, de la Fuente Marcos said. “In order to become a mini-moon, an incoming body has to approach Earth slowly at close range,” de la Fuente Marcos said. After 56.6 days, the sun’s gravitational pull will bring Asteroid 2024 PT5 back into its normal orbit.

Persons: PT5, Carlos de la Fuente Marcos, la Fuente Marcos, orbiters, flybys, It’s, ”, Robert Jedicke, ” Jedicke, Jedicke, “ Organizations: CNN, American Astronomical Society, Astronomers, NASA, Complutense University of Madrid, University of Hawaii’s Institute for Astronomy, Gran, Canarias, Telescope Locations: South Africa, Chelyabinsk, Russia, Hiroshima, Japan, Mars, Canary, Earth

☆ Could a Giant Parasol in Outer Space Help Solve the Climate Crisis?
▼ + stars: | 2024-02-02 | by ( Cara Buckley | ) www.nytimes.com time to read: +1 min

The idea is to create a huge sunshade and send it to a far away point between the Earth and the sun to block a small but crucial amount of solar radiation, enough to counter global warming. Scientists have calculated that if just shy of 2 percent of the sun’s radiation is blocked, that would be enough to cool the planet by 1.5 degrees Celsius, or 2.7 Fahrenheit, and keep Earth within manageable climate boundaries. The idea has been at the outer fringes of conversations about climate solutions for years. But as the climate crisis worsens, interest in sun shields has been gaining momentum, with more researchers offering up variations. There’s even a foundation dedicated to promoting solar shields.

Persons: It’s, Istvan Szapudi Organizations: University of Utah, Massachusetts Institute of Technology, Institute for Astronomy, University of Hawaii

☆ Webb telescope spies millions of stars in stunning spiral galaxies
▼ + stars: | 2024-02-01 | by ( Ashley Strickland | ) edition.cnn.com time to read: +5 min

CNN —The James Webb Space Telescope has captured scintillating portraits of 19 spiral galaxies — and the millions of stars that call them home — in unprecedented detail never seen before by astronomers. Astronomers believe that about 60% of all galaxies are spiral galaxies — and our solar system resides in one of the spiral arms of the Milky Way galaxy. Webb’s observations can help astronomers better understand star formation and the evolution of spiral galaxies like our own. The James Webb Space Telescope captured images of 19 spiral galaxies in near- and mid-infrared light. The images will be used to help astronomers determine the distribution of gas and dust in spiral galaxies, as well as how galaxies both nurture and cease the formation of stars.

Persons: James Webb, Janice Lee, Thomas Williams, ”, Webb’s, cocooned, Erik Rosolowsky, Webb, Rosolowsky, ” Webb, Adam Leroy, Eva Schinnerer, Max Planck, Leroy, ” Leroy Organizations: CNN, Telescope, James Webb Space, NASA, ESA, CSA, STScI, Hubble, Telescope Science, University of Alberta, Ohio State University, Max, Max Planck Institute, Astronomy Locations: Oxford, Chile, Baltimore, Edmonton, Columbus, Heidelberg, Germany

☆ Hubble finds water vapor in small exoplanet’s atmosphere
▼ + stars: | 2024-01-26 | by ( Ashley Strickland | ) edition.cnn.com time to read: +6 min

CNN —Astronomers using the Hubble Space Telescope have detected water molecules in the atmosphere of a small, blazing-hot exoplanet 97 light-years from Earth. The planet, named GJ 9827d, is about twice Earth’s diameter, and it’s the smallest exoplanet found to have water vapor in its atmosphere, according to a new study. Starlight filtering through the planet’s atmosphere helped astronomers measure the signature of water molecules. It’s possible that the planet is a mini-Neptune with a hydrogen-rich atmosphere that contains water vapor. Or astronomers suspect that GJ 9827d could be a warmer version of Jupiter’s icy moon Europa, which contains an ocean beneath a thick, icy crust.

Persons: ”, Laura Kreidberg, Max Planck, Björn Benneke, Hubble, Ian Crossfield, Pierre, Alexis Roy, we’re, ” Benneke, “, GJ, Benneke, Thomas Greene, James Webb, Webb, ” Kreidberg Organizations: CNN —, Hubble, Max, Max Planck Institute, Astronomy, University of Montreal’s Trottier Institute for Research, University of Kansas, University of Montreal’s Trottier Institute, GJ 9827d, NASA’s Ames Research, James Webb Space Telescope, ”, 9827d Locations: Heidelberg, Germany, Lawrence , Kansas, Silicon

☆ Astronomers aren't crying 'aliens' yet, but NASA's James Webb Space Telescope is making this planet look a lot more habitable
▼ + stars: | 2023-09-12 | by ( Morgan Mcfall-Johnsen | ) www.businessinsider.com time to read: +9 min

NASA's James Webb Space Telescope discovered signs of a vast ocean on the planet K2-18 b. Astronomers can't directly look at the surface of the planet, called K2-18 b, but Webb analyzed its atmosphere for hints of what may lie below. That's a strong mark against the molecule's existence on K2-18 b. Confirming these findings requires a lot more observation of K2-18 b. As Blain put it: "K2-18 b is not exactly an Earth twin."

Persons: NASA's James Webb, Webb, James Webb, Madhusudhan, That's, Aaron Gronstal, Doriann Blain, Max Planck, Blain, peered, Webb’s, Crawford, J, Olmsted, haven't, Eliza Kempton, we've, Markus Scheucher, Kempton, I'd, there's, Marianne Guenot Organizations: NASA's James Webb Space Telescope, Service, NASA, University of Cambridge, DMS, Max, Max Planck Institute, Astronomy, Hubble, European Space Agency, CSA, ESA, Cambridge University, Astrophysical Journal, University of Maryland, Jet Propulsion Laboratory Locations: Wall, Silicon

☆ Webb telescope spots water in a nearby planetary system
▼ + stars: | 2023-07-27 | by ( Ashley Strickland | ) edition.cnn.com time to read: +4 min

CNN —Astronomers have detected water vapor swirling close to a nearby star — indicating that the planets forming around it might someday be able to support life. Water vapor mysteryAstronomers were surprised to discover water vapor near the star given its age. The presence of water vapor suggests the planets could contain water in some form. Webb's Mid-Infrared Instrument detected emission lines from water vapor in the inner disk around the star. The research team plans to observe the system with Webb more in the future to reveal additional secrets as a planetary system takes shape.

Persons: Olmsted, Webb, “, ”, Giulia Perotti, Max Planck, Rens Waters, Thomas Henning Organizations: CNN —, NASA, ESA, CSA, J, Max, Max Planck Institute, Astronomy, Radboud University Locations: Heidelberg, Germany, Netherlands

☆ Time appeared to move 5 times slower in the early days of the universe, scientists found
▼ + stars: | 2023-07-05 | by ( Sonam Sheth | ) www.businessinsider.com time to read: +2 min

A new study found that time appeared to move five times slower in the early days of the universe. Scientists used quasars — enormously bright supermassive black holes — to arrive at their findings. The researchers used quasars — supermassive black holes that feed on gas and are among the brightest known celestial objects — to arrive at their finding. Quasars "are crucial to understanding the early universe," one astronomer said in 2018. Albert Einstein, in his general theory of relativity, predicted that we live in an expanding universe, where time was slower in its early years, and now the researchers in this study observed that.

Persons: Albert Einstein's, —, Geraint Lewis, Albert Einstein Organizations: Service, Privacy, CNN, University of Sydney's School of Physics, Sydney Institute for Astronomy

☆ Quasars reveal the early universe moved slower than it does now
▼ + stars: | 2023-07-03 | by ( Ashley Strickland | ) edition.cnn.com time to read: +4 min

CNN —Scientists have peered into the early days of the universe, when it was about 1 billion years old, and discovered that things moved in slow motion compared with now. Unlocking what happened during the early days of the universe can help scientists tackle the biggest mysteries about its origin, how it evolved and what the future holds. “This expansion of space means that our observations of the early universe should appear to be much slower than time flows today. While very bright, supernovas become much harder to observe at greater distances from Earth, which means that astronomers needed another source that would be visible deeper in the early universe. “What we have done is unravel this firework display, showing that quasars, too, can be used as standard markers of time for the early universe.”

Persons: Albert Einstein’s, ”, Geraint Lewis, Einstein, ” Lewis, Brendon Brewer Organizations: CNN —, University of Sydney’s School of Physics, Sydney Institute for Astronomy, University of Auckland

☆ Scientists spot a planet that shouldn’t exist
▼ + stars: | 2023-06-28 | by ( Ashley Strickland | ) edition.cnn.com time to read: +4 min

CNN —A Jupiter-like planet located 520 light-years from Earth may be an unlikely survivor after its host star had a temper tantrum. The gas planet is known as 8 UMi b and was named Halla after its initial discovery by Korean astronomers in 2015. The exoplanet orbits a giant star larger than our sun named Baekdu, located in the Ursa Minor, or “Little Bear,” constellation. Halla orbits Baekdu at a distance about half that between the Earth and the sun at 0.46 astronomical units, or 42,759,659 miles (68,815,020 kilometers). While our solar system only has one star, many stars across the universe exist in binary pairs.

Persons: Halla, “, ”, Dan Huber, Marc Hon, ” Huber, Tim Organizations: CNN, Ursa, Australian Research, University of Sydney, Institute for Astronomy, University of Hawaii, Keck Observatory, Halla, Star Wars Locations: South Korea, Manoa, Canada, France, Hawaii, Mauna Kea

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