Members Can Post Anonymously On This Site
By European Space Agency
As global temperatures records are smashed and greenhouse gas emissions reach new highs, a new report from the UN Environment Programme finds that current pledges under the Paris Agreement put the world on track for a 2.5–2.9°C temperature rise this century – pointing to the urgent need for increased climate action.
The report is timely as nearly 200 nations gather in the coming two weeks at the United Nations COP28 Climate Change Summit to conclude the world’s first ever ‘Global Stocktake’ on climate change. Swift and sustained climate action is needed to avoid the worst consequences of climate change. Satellites are critical tools in the quest to tackle climate change and monitor progress towards a lower-emissions and more resilient world.
View the full article
Discovery Alert: Watch the Synchronized Dance of a 6-Planet System
The discovery: Six planets orbit their central star in a rhythmic beat, a rare case of an “in sync” gravitational lockstep that could offer deep insight into planet formation and evolution.
Key facts: A star smaller and cooler than our Sun hosts a truly strange family of planets: six “sub-Neptunes” – possibly smaller versions of our own Neptune – moving in a cyclic rhythm. This orbital waltz repeats itself so precisely it can be readily set to music.
This animation shows six “sub-Neptune” exoplanets in rhythmic orbits around their star – with a musical tone as each planet passes a line drawn through the system. The line is where the planets cross in front of (transit) their star from Earth’s perspective. In these rhythms, known as “resonance,” the innermost planet makes three orbits for every two of the next planet out. Among the outermost planets, a pattern of four orbits for every three of the next planet out is repeated twice. Animation credit: Dr. Hugh Osborn, University of Bern Details: While multi-planet systems are common in our galaxy, those in a tight gravitational formation known as “resonance” are observed by astronomers far less often. In this case, the planet closest to the star makes three orbits for every two of the next planet out – called a 3/2 resonance – a pattern that is repeated among the four closest planets.
Among the outermost planets, a pattern of four orbits for every three of the next planet out (a 4/3 resonance) is repeated twice. And these resonant orbits are rock-solid: The planets likely have been performing this same rhythmic dance since the system formed billions of years ago. Such reliable stability means this system has not suffered the shocks and shakeups scientists might typically expect in the early days of planet formation – smash-ups and collisions, mergers and breakups as planets jockey for position. And that, in turn, could say something important about how this system formed. Its rigid stability was locked in early; the planets’ 3/2 and 4/3 resonances are almost exactly as they were at the time of formation. More precise measurements of these planets’ masses and orbits will be needed to further sharpen the picture of how the system formed.
Fun facts: The discovery of this system is something of a detective story. The first hints of it came from NASA’s TESS (the Transiting Exoplanet Survey Satellite), which tracks the tiny eclipses – the “transits” – that planets make as they cross the faces of their stars. Combining the TESS measurements, made in separate observations two years apart, revealed an assortment of transits for the host star, called HD 110067. But it was difficult to distinguish how many planets they represented, or to pin down their orbits.
Eventually, astronomers singled out the two innermost planets, with orbital periods – “years” – of 9 days for the closest planet, 14 days for the next one out. A third planet, with a year about 20 days long, was identified with the help of data from CHEOPS, The European Space Agency’s CHaracterising ExOPlanets Satellite.
Then the scientists noticed something extraordinary. The three planets’ orbits matched what would be expected if they were locked in a 3/2 resonance. The next steps were all about math and gravity. The science team, led by Rafael Luque of the University of Chicago, worked through a well-known list of resonances that potentially could be found in such systems, trying to match them to the remaining transits that had been picked up by TESS. The only resonance chain that matched up suggested a fourth planet in the system, with an orbit about 31 days long. Two more transits had been seen, but their orbits remained unaccounted for because they were only single observations (more than one transit observation is needed to pin down a planet’s orbit). The scientists again ran through the list of possible orbits if there were two additional, outer planets that fit the expected chain of resonances across the whole system. The best fit they found: a fifth planet with a 41-day orbit, and a sixth just shy of 55.
At this point the science team almost hit a dead end. The slice of the TESS observations that had any chance of confirming the predicted orbits of the two outer planets had been set aside during processing. Excessive light scattered through the observation field by Earth and the Moon seemed to make them unusable. But not so fast. Scientist Joseph Twicken, of the SETI Institute and of the NASA Ames Research Center, took notice of the scattered light problem. He knew that scientist David Rapetti, also of Ames and of the Universities Space Research Association, happened to be working on a new computer code to recover transit data thought to be lost because of scattered light. At Twicken’s suggestion, Rapetti applied his new code to the TESS data. He found two transits for the outer planets – exactly where the science team led by Luque had predicted.
The discoverers: An international team of researchers led by Rafael Luque, of the University of Chicago, published a paper online on the discovery, “A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067,” in the journal Nature on Nov. 29.
Tracing a link between two neighbour planet at regular time interval along their orbits, creates a pattern unique to each couple. The six planets of the HD110067 system create together a mesmerising geometric pattern due to their resonance-chain. Credit: Thibaut Roger/NCCR PlanetS, CC BY-NC-SA 4.0 View the full article
By European Space Agency
Video: 00:02:07 We are all intricately interconnected to our Earth – from the trees that provide us with oxygen, to the natural sources that shape our landscape. ESA's Earth observation programme is at the forefront of monitoring our planet's dynamic changes. Using cutting-edge satellite technology, ESA captures invaluable data on Earth's atmosphere, land and oceans. From tracking climate patterns to assessing environmental health, ESA's Earth observation initiatives provide essential insights for scientific research, environmental management and disaster response. By harnessing space technology, ESA contributes significantly to our understanding of Earth – ensuring a sustainable future for generations to come.
View the full article
(Oct. 4, 2023) — The Roscosmos Progress 84 cargo craft is pictured docked to the International Space Station’s Poisk module.NASA NASA will provide live launch and docking coverage of the Roscosmos Progress 86 cargo spacecraft carrying about three tons of food, fuel, and supplies for the Expedition 70 crew aboard the International Space Station.
The unpiloted spacecraft is scheduled to launch at 4:25 a.m. EST on Friday, Dec. 1 (2:25 p.m. Baikonur time), on a Soyuz rocket from the Baikonur Cosmodrome in Kazakhstan.
NASA coverage will begin at 4 a.m. on the NASA+ streaming service via the web or the NASA app. Coverage also will air live on NASA Television, YouTube, and on the agency’s website. Learn how to stream NASA TV through a variety of platforms including social media.
The Progress spacecraft will be placed into a two-day, 34-orbit journey to the station, leading to an automatic docking to the Poisk module at 6:14 a.m. Sunday, Dec. 3. Coverage of rendezvous and docking will begin at 5:30 a.m. on NASA Television and the agency’s website.
The spacecraft will remain at the orbiting laboratory for approximately six months, then undock for a destructive but safe re-entry into Earth’s atmosphere to dispose of trash loaded by the crew.
The International Space Station is a convergence of science, technology, and human innovation that enables research not possible on Earth. For more than 23 years, NASA has supported a continuous U.S. human presence aboard the orbiting laboratory, through which humans have learned to live and work in space for extended periods of time. The space station is a springboard for the development of commercial destinations in space and a low Earth orbit economy, as well as NASA’s next great leaps in exploration, including Artemis missions to the Moon and eventually Mars.
Get breaking news, images, and features from the space station on Instagram, Facebook, and X.
Learn more about the space station, its research, and crew, at:
Johnson Space Center, Houston
Last Updated Nov 28, 2023 Related Terms
Missions International Space Station (ISS) View the full article
3 min read
NASA to Showcase Earth Science Data at COP28
This illustration shows the international Surface Water and Ocean Topography (SWOT) satellite in orbit over Earth. SWOT’s main instrument, KaRIn, helps survey the water on more than 90% of Earth’s surface. Credit: NASA/JPL-Caltech. NASA/JPL-Caltech With 26 Earth-observing satellite missions, as well as instruments flying on planes and the space station, NASA has a global vantage point for studying our planet’s oceans, land, ice, and atmosphere and deciphering how changes in one drive change in others.
The agency will share that knowledge and data at the 28th U.N. Climate Change Conference of the Parties (COP28), which brings international parties together to accelerate action toward the goals of the Paris Agreement and the U.N. Framework Convention on Climate Change. COP28 will be held at the Expo City in Dubai, United Arab Emirates from Thursday, Nov. 30 to Tuesday, Dec. 12.
All U.S. events at COP28 are open to the local press and will be live-streamed on the U.S. Center at COP28 website and the U.S. Center YouTube channel.
NASA takes a full-picture approach to understanding all areas of our home planet using our vast satellite fleet and the data collected from their observations. The agency’s data is open-source and available for the public and scientists to study. NASA is showcasing the data at COP28 to share the different ways it can be used globally. The agency’s complete collection of Earth data can be found here.
The scientific research and understanding developed from NASA’s Earth observations are made into predictive models. Those models can be used to develop applications and actionable science to inform individuals including civic leaders and planners, resource managers, emergency managers, and communities looking to mitigate and adapt to climate change.
These satellites and models are augmented by the observations made from the International Space Station. The inclined, low Earth orbit from the station provides variable views and lighting over more than 90 percent of the inhabited surface of the Earth, a useful complement to sensor systems on satellites in higher-altitude polar orbits.
Closer to the surface, NASA’s aviation research is focused on advancing technologies for more efficient airplane flight, including hybrid-electric propulsion, advanced materials, artificial intelligence, and machine learning. Technological advances in these areas have the potential to reduce human impacts on climate and air quality.
At the U.S. Center at COP28, in-person visitors can see the NASA Hyperwall where NASA scientists will provide live presentations showing how the agency’s work supports the Biden-Harris Administration’s agenda to encourage a governmentwide approach to climate change. During the hyperwall talks, NASA leaders, scientists and interagency partners will discuss the agency’s end-to-end research about our planet. This includes designing new instruments, satellites, and systems to collect and freely distribute the most complete and precise data possible about Earth’s land, ocean, and atmospheric system. A full schedule of NASA’s hyperwall talks is available.
Last Updated Nov 27, 2023 Editor Contact Related Terms
Climate Change Earth Keep Exploring Discover More Topics From NASA
Your home. Our Mission. And the one planet that NASA studies more than any other.
NASA is a global leader in studying Earth’s changing climate.
Explore Earth Science
Earth Science Data
View the full article
Check out these Videos