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ESA/WEF Panel discussion and In-Flight Call with Matthias Maurer
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By European Space Agency
The countdown is on! The 2024 call for applications for ESA’s Student Internship Programme closes on 30 November. This is your moment to take the first step towards an extraordinary career in space. Explore this year’s internship opportunities on our job portal and imagine yourself contributing to the next breakthroughs in space. Craft your profile, upload your CV and share your passion in your motivation letter. Don’t just dream of space—become a part of it! Apply today and set your career on a trajectory for success with ESA.
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By NASA
Earth Observer Earth Home Earth Observer Home Editor’s Corner Feature Articles Meeting Summaries News Science in the News Calendars In Memoriam More Archives 3 min read
Autumn Leaves – Call for Volunteers
The Global Learning and Observations to Benefit the Environment (GLOBE) Program is calling on volunteers of all ages to help students and citizen scientists document seasonal change through leaf color and land cover. The data collection event will support students across North America, Latin America, Central America, and Europe, who are working together to document the seasonal changes taking place from September through December – see Figure. The observations will also provide vital data for GLOBE students creating student research projects for the GLOBE 2025 International Virtual Science Symposium (IVSS). The project is part of GLOBE’s Intensive Observation Period (IOP), which collects data during a focused period to assess how climate change is unfolding in different regions of the world.
Figure. Locations Green-Down observations being entered into the GLOBE database. Figure credit: GLOBE Green down is the seasonal change when leaves change from green to brown and then fall to the ground. During green-down data collection, volunteers take regular, daily photos of trees to document the transition in color. Regular observations of land cover and tree height capture the broader changes happening around the tree.
By gathering this data, you can provide important information about when a single tree changes ahead of or behind the others in your region. When this data is paired with satellite observations, researchers gain a much stronger picture of how seasonal and climate variations impact the life cycles of plants and animals.
The GLOBE European Phenology Campaign has created materials to assist educators in these efforts. This includes a series of YouTube videos that volunteers can use to select a tree for the phenology project, estimate tree height, and assess land cover. In addition, volunteers can refer to the green-down protocol for guidance at the beginning of the survey. Educators can learn more about the importance of the green-down study by registering as a GLOBE Educator at the GLOBE “Create an Account” website.
GLOBE students have been collecting seasonal variability in plant and animal data for decades. This work will augment global databases to help students, educators, and scientists around the world study climate change.
These observations are taking place around the world. This IOP is being conducted in conjunction with the GLOBE North America Phenology Campaign and the European Phenology Campaign, which focus on monitoring and reporting of cycles in plants and animals to help validate the timing of changes in growing season and habitat. The work is also being conducted in conjunction with the Trees Within LAC Campaign, which is collecting information about tree species and their dynamics over time.
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Last Updated Oct 25, 2024 Related Terms
Earth Science View the full article
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By NASA
Curiosity Navigation Curiosity Home Mission Overview Where is Curiosity? Mission Updates Science Overview Instruments Highlights Exploration Goals News and Features Multimedia Curiosity Raw Images Images Videos Audio More Resources Mars Missions Mars Sample Return Mars Perseverance Rover Mars Curiosity Rover MAVEN Mars Reconnaissance Orbiter Mars Odyssey More Mars Missions The Solar System The Sun Mercury Venus Earth The Moon Mars Jupiter Saturn Uranus Neptune Pluto & Dwarf Planets Asteroids, Comets & Meteors The Kuiper Belt The Oort Cloud 2 min read
Sols 4280-4281: Last Call at Kings Canyon
This image was taken by Right Navigation Camera onboard NASA’s Mars rover Curiosity on Sol 4278 (2024-08-18 16:30:04 UTC). NASA/JPL-Caltech Earth planning date: Monday, Aug. 19, 2024
Curiosity successfully completed the drill sequence at the Kings Canyon site within the Gediz Vallis channel. Today was a smooth planning day as we decided to stay put for sols 4280 and 4281 to obtain APXS data of the drill tailings (the crushed rock removed from the drill hole) before we reposition the rover nearby for our next set of observations. The science team is eagerly plotting the rover’s next move and is looking forward to all the interesting targets along the route ahead!
ChemCam had a very busy day with multiple activities in the plan. ChemCam LIBS will examine the chemistry of rocks at nearby “Cathedral Lake” and “Royce Lakes” to analyze the fresh surfaces that were recently broken by the weight of the rover driving over them. Mastcam will provide their standard documentation images of these locations after the LIBS instrument zaps each target. ChemCam planned two long distance RMI images and one passive RMI image to get a closer view of the diversity of rocks at Milestone Peak and the upper channel and the yardang unit – a white, wind-sculped rock that caps the mound in Gale crater.
In our current workspace, we planned a MAHLI image and will use the dust removal tool (DRT) to characterize the grain size of the light-toned rock near our drill location at “Gabbot Pass.” Mastam has amassed a beautiful collection of mosaics at our current location and therefore included only one small Mastcam mosaic of the nearby Texoli butte that will provide context for a recently acquired ChemCam LD RMI image. The environmental theme group planned surveys to search for dust devils as well as measurements to observe the amount of dust in the atmosphere.
Looking ahead, we will reposition the rover slightly to access “Fourth Recess Lake” to quantify its chemistry for comparison to past and future observations within the Gediz Vallis channel. And after that, it’s McDonald Pass or bust!
Written by Sharon Wilson Purdy, Planetary Geologist at the Smithsonian National Air and Space Museum
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Last Updated Aug 20, 2024 Related Terms
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By NASA
SatSummit brings together leaders in the satellite industry and global development experts for two days of presentations and discussions on using satellite data to address critical development challenges. Rahul Ramachandran (ST11/IMPACT) participated in a panel focused on large earth foundation models, offering an overview of AI foundation models and their potential for societal good. He detailed NASA’s approach to building these models and the agency’s overall strategy, underscoring their importance in advancing Earth science and global development initiatives.
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By NASA
5 min read
NASA Scientists on Why We Might Not Spot Solar Panel Technosignatures
One of NASA’s key priorities is understanding the potential for life elsewhere in the universe. NASA has not found any credible evidence of extraterrestrial life — but NASA is exploring the solar system and beyond to help us answer fundamental questions, including whether we are alone in the universe.
For those who study the potential for life beyond Earth, one of the questions has long been trying to determine the likelihood of microbial life versus complex life versus a civilization so advanced that we can spot signs of it, called technosignatures, from here at home. Studying the answers to questions like that can help guide suggestions on new telescopes or missions to emphasize the most likely places and ways to look for life.
Now a recent paper published May 24 in the Astrophysical Journal postulates that if advanced extraterrestrial civilizations exist, one reason they might be hard to detect with telescopes from our vantage point is because their energy requirements may be relatively modest. If their culture, technology, and population size do not need vast amounts of power, they would not be required to build enormous stellar-energy harvesting structures that could be detected by current or proposed telescopes. Such structures, based on our own Earthly experience, might be solar panel arrays that cover a significant portion of their planet’s surface or orbiting megastructures to harness most of their parent star’s energy—both of which we might be able to spot from our own solar system.
Conceptual image of an exoplanet with an advanced extraterrestrial civilization. Structures on the right are orbiting solar panel arrays that harvest light from the parent star and convert it into electricity that is then beamed to the surface via microwaves. The exoplanet on the left illustrates other potential technosignatures: city lights (glowing circular structures) on the night side and multi-colored clouds on the day side that represent various forms of pollution, such as nitrogen dioxide gas from burning fossil fuels or chlorofluorocarbons used in refrigeration. NASA/Jay Freidlander “We found that even if our current population of about 8 billion stabilizes at 30 billion with a high standard of living, and we only use solar energy for power, we still use way less energy than that provided by all the sunlight illuminating our planet,” said Ravi Kopparapu of NASA’s Goddard Space Flight Center in Greenbelt, Maryland, lead author of the paper.
The study has implications for the Fermi paradox, postulated by physicist Enrico Fermi, which asks the question that since our galaxy is ancient and vast, and interstellar travel is difficult but possible, why hasn’t an alien civilization spread across the galaxy by now?
“The implication is that civilizations may not feel compelled to expand all over the galaxy because they may achieve sustainable population and energy-usage levels even if they choose a very high standard of living,” said Kopparapu. “They may expand within their own stellar system, or even within nearby star systems, but a galaxy-spanning civilizations may not exist.”
Additionally, our own technological expertise may not yet be able to predict what more advanced civilizations could do.
“Large-scale stellar-energy harvesting structures may especially be obsolete when considering technological advances,” adds Vincent Kofman, a co-author of the paper at NASA Goddard and American University, Washington, D.C. “Surely a society that can place enormous structures in space would be able to access nuclear fusion or other space-efficient methods of generating power.”
The researchers used computer models and NASA satellite data to simulate an Earth-like planet with varying levels of silicon solar panel coverage. The team then modeled an advanced telescope like the proposed NASA Habitable Worlds Observatory to see if it could detect solar panels on the planet about 30 light-years away, which is relatively nearby in a galaxy that spans over 100,000 light-years. They found that it would require several hundreds of hours of observing time with that type of telescope to detect signatures from solar panels covering about 23% of the land area on an Earth-like exoplanet. However, the requirement for 30 billion humans at a high-living standard was only about 8.9% solar-panel coverage.
Extraterrestrial civilizations with advanced technology could be discovered by their technosignatures – observational manifestations of extraterrestrial technology that could be detected or inferred through astronomical searches. For decades, scientists have been using radio telescopes to look for potential extraterrestrial radio transmissions. More recently, astronomers have proposed using a telescope like the Habitable Worlds Observatory to look for other kinds of technosignatures, such as chemical “fingerprints” in exoplanet atmospheres or specific characteristics in the light reflected by an exoplanet that might announce the presence of vast silicon solar arrays.
The new study assumes that extraterrestrials would build solar panels out of silicon because it’s relatively abundant compared to other elements used in solar power, such as germanium, gallium, or arsenic. Also, silicon is good at converting the light emitted by Sun-like stars into electricity and it’s cost-effective to mine and manufacture into solar cells.
The researchers also assume that a hypothetical extraterrestrial civilization would rely exclusively on solar energy. However, if other sources of energy are used, such as nuclear fusion, it would reduce the silicon technosignature, making the civilization even harder to detect. The study further assumes that the civilization’s population stabilizes at some point. If this doesn’t happen for whatever reason, perhaps they will be driven to expand ever-father into deep space. Finally, it’s impossible to know if an advanced civilization may be using something we haven’t imagined yet that requires immense amounts of power.
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Last Updated Aug 02, 2024 Editor wasteigerwald Contact wasteigerwald william.a.steigerwald@nasa.gov Location NASA Goddard Space Flight Center Related Terms
Astrobiology Goddard Space Flight Center The Search for Life The Universe Explore More
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