Jump to content

Recommended Posts

Posted
Sentinel-2 captures Antarctica’s new iceberg

Satellite imagery confirms an enormous iceberg, around five times the size of Malta, has finally calved from Antarctica’s Brunt Ice Shelf. The new berg, estimated to be around 1550 sq km and around 150 m thick, calved when the crack known as Chasm-1 fully extended northwards severing the west part of the ice shelf.

This crack was first revealed to be extending in early 2012 after having been dormant for some decades. After several years of desperately clinging on, image data from the Copernicus Sentinel missions visually confirm the calving event.

View the full article

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Similar Topics

    • By NASA
      NASA’s Dawn spacecraft captured this image of Vesta as it left the giant asteroid’s orbit in 2012. The framing camera was looking down at the north pole, which is in the middle of the image.NASA/JPL-Caltech/UCLA/MPS/DLR/IDA Known as flow formations, these channels could be etched on bodies that would seem inhospitable to liquid because they are exposed to the extreme vacuum conditions of space.
      Pocked with craters, the surfaces of many celestial bodies in our solar system provide clear evidence of a 4.6-billion-year battering by meteoroids and other space debris. But on some worlds, including the giant asteroid Vesta that NASA’s Dawn mission explored, the surfaces also contain deep channels, or gullies, whose origins are not fully understood.
      A prime hypothesis holds that they formed from dry debris flows driven by geophysical processes, such as meteoroid impacts, and changes in temperature due to Sun exposure. A recent NASA-funded study, however, provides some evidence that impacts on Vesta may have triggered a less-obvious geologic process: sudden and brief flows of water that carved gullies and deposited fans of sediment. By using lab equipment to mimic conditions on Vesta, the study, which appeared in Planetary Science Journal, detailed for the first time what the liquid could be made of and how long it would flow before freezing.
      Although the existence of frozen brine deposits on Vesta is unconfirmed, scientists have previously hypothesized that meteoroid impacts could have exposed and melted ice that lay under the surface of worlds like Vesta. In that scenario, flows resulting from this process could have etched gullies and other surface features that resemble those on Earth.
      To explore potential explanations for deep channels, or gullies, seen on Vesta, scientists used JPL’s Dirty Under-vacuum Simulation Testbed for Icy Environments, or DUSTIE, to simulate conditions on the giant asteroid that would occur after meteoroids strike the surface.NASA/JPL-Caltech But how could airless worlds — celestial bodies without atmospheres and exposed to the intense vacuum of space — host liquids on the surface long enough for them to flow? Such a process would run contrary to the understanding that liquids quickly destabilize in a vacuum, changing to a gas when the pressure drops.
      “Not only do impacts trigger a flow of liquid on the surface, the liquids are active long enough to create specific surface features,” said project leader and planetary scientist Jennifer Scully of NASA’s Jet Propulsion Laboratory in Southern California, where the experiments were conducted. “But for how long? Most liquids become unstable quickly on these airless bodies, where the vacuum of space is unyielding.”
      The critical component turns out to be sodium chloride — table salt. The experiments found that in conditions like those on Vesta, pure water froze almost instantly, while briny liquids stayed fluid for at least an hour. “That’s long enough to form the flow-associated features identified on Vesta, which were estimated to require up to a half-hour,” said lead author Michael J. Poston of the Southwest Research Institute in San Antonio.
      Launched in 2007, the Dawn spacecraft traveled to the main asteroid belt between Mars and Jupiter to orbit Vesta for 14 months and Ceres for almost four years. Before ending in 2018, the mission uncovered evidence that Ceres had been home to a subsurface reservoir of brine and may still be transferring brines from its interior to the surface. The recent research offers insights into processes on Ceres but focuses on Vesta, where ice and salts may produce briny liquid when heated by an impact, scientists said.
      Re-creating Vesta
      To re-create Vesta-like conditions that would occur after a meteoroid impact, the scientists relied on a test chamber at JPL called the Dirty Under-vacuum Simulation Testbed for Icy Environments, or DUSTIE. By rapidly reducing the air pressure surrounding samples of liquid, they mimicked the environment around fluid that comes to the surface. Exposed to vacuum conditions, pure water froze instantly. But salty fluids hung around longer, continuing to flow before freezing.
      The brines they experimented with were a little over an inch (a few centimeters) deep; scientists concluded the flows on Vesta that are yards to tens of yards deep would take even longer to refreeze.
      The researchers were also able to re-create the “lids” of frozen material thought to form on brines. Essentially a frozen top layer, the lids stabilize the liquid beneath them, protecting it from being exposed to the vacuum of space — or, in this case the vacuum of the DUSTIE chamber — and helping the liquid flow longer before freezing again.
      This phenomenon is similar to how on Earth lava flows farther in lava tubes than when exposed to cool surface temperatures. It also matches up with modeling research conducted around potential mud volcanoes on Mars and volcanoes that may have spewed icy material from volcanoes on Jupiter’s moon Europa.
      “Our results contribute to a growing body of work that uses lab experiments to understand how long liquids last on a variety of worlds,” Scully said.
      Find more information about NASA’s Dawn mission here:
      https://science.nasa.gov/mission/dawn/
      News Media Contacts
      Gretchen McCartney
      Jet Propulsion Laboratory, Pasadena, Calif.
      818-287-4115
      gretchen.p.mccartney@jpl.nasa.gov 
      Karen Fox / Molly Wasser
      NASA Headquarters, Washington
      202-358-1600
      karen.c.fox@nasa.gov / molly.l.wasser@nasa.gov
      2024-178
      Share
      Details
      Last Updated Dec 20, 2024 Related Terms
      Dawn Asteroids Ceres Jet Propulsion Laboratory Vesta Explore More
      5 min read Avalanches, Icy Explosions, and Dunes: NASA Is Tracking New Year on Mars
      Article 1 hour ago 5 min read Cutting-Edge Satellite Tracks Lake Water Levels in Ohio River Basin
      Article 3 days ago 5 min read NASA Mars Orbiter Spots Retired InSight Lander to Study Dust Movement
      Article 4 days ago Keep Exploring Discover More Topics From NASA
      Missions
      Humans in Space
      Climate Change
      Solar System
      View the full article
    • By European Space Agency
      Global warming is driving the rapid melting of the Greenland Ice Sheet, contributing to global sea level rise and disrupting weather patterns worldwide. Because of this, precise measurements of its changing shape are of critical importance for adapting to climate change.
      Now, scientists have delivered the first measurements of the Greenland Ice Sheet’s changing shape using data from ESA's CryoSat and NASA's ICESat-2 ice missions.
      View the full article
    • By European Space Agency
      Video: 00:04:04 English Paxi explores ice
      Join Paxi on an adventure to the North and South poles, to learn more about ice and its role in keeping Earth cool.
       
      Italian Paxi osserva il ghiaccio
      Unisciti a Paxi in un'avventura ai poli Nord e Sud, per saperne di più sul ghiaccio e sul suo ruolo nel mantenere la Terra fresca.
       
      German Paxi erforscht das Eis
      Begleiten Sie Paxi auf ein Abenteuer zum Nord- und Südpol, um mehr über Eis und seine Rolle bei der Kühlung der Erde zu erfahren.
       
      French Paxi explore la glace
      Rejoignez Paxi dans une aventure aux pôles Nord et Sud, pour en savoir plus sur la glace et son rôle dans le refroidissement de la Terre.
       
      Spanish Paxi explora el hielo
      Únete a Paxi en una aventura a los polos Norte y Sur, para aprender más sobre el hielo y su papel en mantener la Tierra fría.
       
      Portuguese Paxi explora o gelo
      Junte-se a Paxi numa aventura aos pólos Norte e Sul, para aprender mais sobre o gelo e o seu papel na manutenção da Terra fresca.
       
      Greek Ο Πάξι εξερευνά τον πάγο
      Ελάτε μαζί με τον Paxi σε μια περιπέτεια στο Βόρειο και το Νότιο Πόλο, για να μάθετε περισσότερα για τον πάγο και το ρόλο του στη διατήρηση της ψύξης της Γης.
       
      Polish Paxi bada lód
      Dołącz do Paxi podczas przygody na biegunie północnym i południowym, aby dowiedzieć się więcej o lodzie i jego roli w chłodzeniu Ziemi.
       
      Swedish Paxi utforskar is
      Följ med Paxi på ett äventyr till Nord- och Sydpolen för att lära dig mer om is och dess roll för att hålla jorden sval.
       
      Norwegian Paxi utforsker is
      Bli med Paxi på et eventyr til Nord- og Sydpolen for å lære mer om is og dens rolle i å holde jorden kjølig.
       
      Danish Paxi udforsker is
      Tag med Paxi på eventyr til Nord- og Sydpolen for at lære mere om is og dens rolle i at holde Jorden kølig.
       
      Romanian Paxi explorează gheață
      Alăturați-vă lui Paxi într-o aventură la polii Nord și Sud, pentru a afla mai multe despre gheață și rolul său în menținerea Pământului rece.
       
      Finnish Paxi tutkii jäätä
      Lähde Paxin mukaan seikkailulle pohjois- ja etelänavoille ja opi lisää jäästä ja sen roolista maapallon viileänä pitämisessä.
       
      Estonian Paxi avastab jääd
      Liitu Paxiga seiklusel põhja- ja lõunapoolusele, et õppida rohkem jääst ja selle rollist Maa jahedana hoidmisel.
       
      Czech Paxi zkoumá led
      Vydejte se s Paxi na dobrodružnou výpravu na severní a jižní pól, abyste se dozvěděli více o ledu a jeho úloze při udržování chladu na Zemi.
       
      Dutch Paxi onderzoekt ijs
      Ga mee met Paxi op avontuur naar de Noord- en Zuidpool om meer te leren over ijs en de rol die ijs speelt bij het koel houden van de aarde.
      View the full article
    • By NASA
      The Fresh Eyes on Ice team receives the C. Peter Magrath exemplary project award from the Association of Public and Land-grant Universities. H. Buurman Congratulations to the Fresh Eyes on Ice project, which received a C. Peter Magrath exemplary project award from the Association of Public and Land-grant Universities! The award recognizes programs that demonstrate how colleges and universities have redesigned their learning, discovery, and engagement missions to deepen their partnerships and achieve broader impacts in their communities.
      “Thank you to all of you for making this project what it is.” said Fresh Eyes on Ice project lead Research Professor Katie Spellman from the University of Alaska, Fairbanks. “We couldn’t do it without you.”
      Fresh Eyes on Ice tracks changes in the timing and thickness of ice throughout Alaska and the circumpolar north. You can get involved by downloading the GLOBE Observer app and taking photos of ice conditions using the GLOBE Land Cover protocol.
      Fresh Eyes on Ice is supported by the Navigating the New Arctic Program of the U.S. National Science Foundation and the NASA Citizen Science for Earth Systems Program.
      Facebook logo @DoNASAScience @DoNASAScience Share








      Details
      Last Updated Dec 05, 2024 Related Terms
      Citizen Science Earth Science Explore More
      4 min read 2024 AGU Fall Meeting Hyperwall Schedule


      Article


      1 day ago
      2 min read This Thanksgiving, We’re Grateful for NASA’s Volunteer Scientists!


      Article


      1 week ago
      9 min read The Earth Observer Editor’s Corner: Fall 2024


      Article


      3 weeks ago
      View the full article
    • By NASA
      The future of human space exploration took a bold step forward at NASA’s Johnson Space Center in Houston on Nov. 15, 2024, as Texas A&M University leaders’ broke ground for the Texas A&M University Space Institute.

      Texas state officials, NASA leaders, and distinguished guests participated in the ceremony, held near the future development site of Johnson’s new Exploration Park, marking an important milestone in a transformative partnership to advance research, innovation, and human spaceflight.
      NASA’s Johnson Space Center Director Vanessa Wyche gives remarks at the Texas A&M University Space Institute groundbreaking ceremony in Houston on Nov. 15, 2024. NASA/Robert Markowitz “This groundbreaking is not just a physical act of breaking ground or planting a flag,” said Johnson Director Vanessa Wyche. “This is the moment our vision—to dare to expand frontiers and unite with our partners to explore for the benefit of all humanity—will be manifested.”

      The Texas A&M University Space Institute will be the first tenant at NASA’s 240-acre Exploration Park to support facilities that enhance commercial access, foster a collaborative development environment, and strengthen the United States’ competitiveness in the space and aerospace industries.
      Chairman Bill Mahomes Jr. of the Texas A&M University System Board of Regents, left, Chancellor John Sharp of the Texas A&M University System, and Johnson Director Vanessa Wyche hold a commemorative plaque celebrating the establishment of the Texas A&M University Space Institute at Exploration Park. NASA/Robert Markowitz Exploration Park aims to foster research, technology transfer, and a sustainable pipeline of career development for the Artemis Generation and Texas workers transitioning to the space economy. The park represents a key achievement of Johnson’s 2024 Dare | Unite | Explore commitments, emphasizing its role as the hub of human spaceflight, developing strategic partnerships, and paving the way for a thriving space economy.

      Research conducted at the Space Institute is expected to accelerate human spaceflight by providing opportunities for the brightest minds worldwide to address the challenges of living in low Earth orbit, on the Moon, and on Mars.
      Senior leadership from Johnson Space Center gathers for the groundbreaking ceremony of the Texas A&M University Space Institute. NASA/Robert Markowitz Industry leaders and Johnson executives stood alongside NASA’s Lunar Terrain Vehicle and Space Exploration Vehicle, symbolizing their commitment to fostering innovation and collaboration.

      Texas A&M University Space Institute director and retired NASA astronaut Dr. Nancy Currie-Gregg and Dr. Rob Ambrose, Space Institute associate director, served as the masters of ceremony for the event. Johnson leaders present included Deputy Director Stephen Koerner; Associate Director Donna Shafer; Associate Director for Vision and Strategy Douglas Terrier; Director of External Relations Office Arturo Sanchez; and Chief Technologist and Director of the Business Development and Technology Integration Office Nick Skytland.

      Also in attendance were Texas State Rep. Greg Bonnen; Texas A&M University System Board of Regents Chairman William Mahomes Jr.; Texas A&M University System Chancellor John Sharp; Texas A&M University President and Retired Air Force Gen. Mark Welsh III; and Texas A&M Engineering Vice Chancellor and Dean Robert Bishop.
      Texas A&M University Space Institute Director and retired NASA astronaut Nancy Currie-Gregg plants a Texas A&M University Space Institute flag at Johnson Space Center, symbolizing the partnership between the institute and NASA.NASA/Robert Markowitz The institute, expected to open in September 2026, will feature the world’s largest indoor simulation spaces for lunar and Martian surface operations, high-bay laboratories, and multifunctional project rooms.

      “The future of Texas’ legacy in aerospace is brighter than ever as the Texas A&M Space Institute in Exploration Park will create an unparalleled aerospace, economic, business development, research, and innovation region across the state,” Wyche said. “Humanity’s next giant leap starts here!”
      View the full article
  • Check out these Videos

×
×
  • Create New...