Some ‘water worlds’ like Jupiter’s moon Europa could potentially be habitable for life.
NASA/JPL-Caltech/SETI InstituteDaniel Apai, University of Arizona
The search for life beyond Earth is a key driver of modern astronomy and planetary science. The U.S. is building multiple major telescopes and planetary probes to advance this search. However, the signs of life – called biosignatures – that scientists may find will likely be difficult to interpret. Figuring out where exactly to look also remains challenging.
I am an astrophysicist and astrobiologist with over 20 years of experience studying extrasolar planets – which are planets beyond our solar system.
My colleagues and I have developed a new approach that will identify the most interesting planets or moons to search for life and help interpret potential biosignatures. We do this by modeling how different organisms may fare in different environments, informed by studies of limits of life on Earth.
New telescopes to search for life
Astronomers are developing plans and technology for increasingly powerful space telescopes. For instance, NASA is working on its proposed Habitable Worlds Observatory, which would take ultrasharp images that directly show the planets orbiting nearby stars.
My colleagues and I are developing another concept, the Nautilus space telescope constellation, which is designed to study hundreds of potentially Earthlike planets as they pass in front of their host stars.
Future telescopes, like the proposed Nautilus, could help search the skies for habitable planets.Katie Yung, Daniel Apai /University of Arizona and AllThingsSpace /SketchFab, CC BY-ND
These and other future telescopes aim to provide more sensitive studies of more alien worlds. Their development prompts two important questions: “Where to look?” and “Are the environments where we think we see signs of life actually habitable?”
The strongly disputed claims of potential signs of life in the exoplanet K2-18b, announced in April 2025, and previous similar claims in Venus, show how difficult it is to conclusively identify the presence of life from remote-sensing data.
When is an alien world habitable?
Oxford Languages defines “habitable” as “suitable or good enough to live in.” But how do scientists know what is “good enough to live in” for extraterrestrial organisms? Could alien microbes frolic in lakes of boiling acid or frigid liquid methane, or float in water droplets in Venus’ upper atmosphere?
To keep it simple, NASA’s mantra has been “follow the water.” This makes sense – water is essential for all Earth life we know of. A planet with liquid water would also have a temperate environment. It wouldn’t be so cold that it slows down chemical reactions, nor would it be so hot that it destroys the complex molecules necessary for life.
However, with astronomers’ rapidly growing capabilities for characterizing alien worlds, astrobiologists need an approach that is more quantitative and nuanced than the water or no-water classification.
A community effort
As part of the NASA-funded Alien Earths project that I lead, astrobiologist Rory Barnes and I worked on this problem with a group of experts – astrobiologists, planetary scientists, exoplanet experts, ecologists, biologists and chemists – drawn from the largest network of exoplanet and astrobiology researchers, NASA’s Nexus for Exoplanet System Science, or NExSS.
Over a hundred colleagues provided us with ideas, and two questions came up often:
First, how do we know what life needs, if we do not understand the full range of extraterrestrial life? Scientists know a lot about life on Earth, but most astrobiologists agree that more exotic types of life – perhaps based on different combinations of chemical elements and solvents – are possible. How do we determine what conditions those other types of life may require?
Second, the approach has to work with incomplete data. Potential sites for life beyond Earth – “extrasolar habitats” – are very difficult to study directly, and often impossible to visit and sample.
For example, the Martian subsurface remains mostly out of our reach. Places like Jupiter’s moon Europa’s and Saturn’s Moon Enceladus’ subsurface oceans and all extrasolar planets remain practically unreachable. Scientists study them indirectly, often only using remote observations. These measurements can’t tell you as much as actual samples would.
Mars’ hot, dusty surface is hostile for life. But scientists haven’t been able to study whether some organisms could lurk beneath.NASA/JPL-Caltech/Malin Space Science Systems
To make matters worse, measurements often have uncertainties. For example, we may be only 88% confident that water vapor is present in an exoplanet’s atmosphere. Our framework has to be able to work with small amounts of data and handle uncertainties. And, we need to accept that the answers will often not be black or white.
A new approach to habitability
The new approach, called the quantitative habitability framework, has two distinguishing features:
First, we moved away from trying to answer the vague “habitable to life” question and narrowed it to a more specific and practically answerable question: Would the conditions in the habitat – as we know them – allow a specific (known or yet unknown) species or ecosystem to survive?
Even on Earth, organisms require different conditions to survive – there are no camels in Antarctica. By talking about specific organisms, we made the question easier to answer.
Second, the quantitative habitability framework does not insist on black-or-white answers. It compares computer models to calculate a probabilistic answer. Instead of assuming that liquid water is a key limiting factor, we compare our understanding of the conditions an organism requires (the “organism model”) with our understanding of the conditions present in the environment (the “habitat model”).
Both have uncertainties. Our understanding of each can be incomplete. Yet, we can handle the uncertainties mathematically. By comparing the two models, we can determine the probability that an organism and a habitat are compatible.
As a simplistic example, our habitat model for Antarctica may state that temperatures are often below freezing. And our organism model for a camel may state that it does not survive long in cold temperatures. Unsurprisingly, we would correctly predict a near-zero probability that Antarctica is a good habitat for camels.
A hydrothermal vent deep in the Atlantic Ocean. These vents discharge incredibly hot plumes of water, but some host hearty microorganisms.P. Rona / OAR/National Undersea Research Program (NURP); NOAA
We had a blast working on this project. To study the limits of life, we collected literature data on extreme organisms, from insects that live in the Himalayas at high altitudes and low temperatures to microorganisms that flourish in hydrothermal vents on the ocean floor and feed on chemical energy.
We explored, via our models, whether they may survive in the Martian subsurface or in Europa’s oceans. We also investigated if marine bacteria that produce oxygen in Earth’s oceans could potentially survive on known extrasolar planets.
Although comprehensive and detailed, this approach makes important simplifications. For example, it does not yet model how life may shape the planet, nor does it account for the full array of nutrients organisms may need. These simplifications are by design.
In most of the environments we currently study, we know too little about the conditions to meaningfully attempt such models – except for some solar system bodies, such as Saturn’s Enceladus.
The quantitative habitability framework allows my team to answer questions like whether astrobiologists might be interested in a subsurface location on Mars, given the available data, or whether astronomers should turn their telescopes to planet A or planet B while searching for life. Our framework is available as an open-source computer model, which astrobiologists can now readily use and further develop to help with current and future projects.
If scientists do detect a potential signature of life, this approach can help assess if the environment where it is detected can actually support the type of life that leads to the signature detected.
Our next steps will be to build a database of terrestrial organisms that live in extreme environments and represent the limits of life. To this data, we can also add models for hypothetical alien life. By integrating those into the quantitative habitability framework, we will be able to work out scenarios, interpret new data coming from other worlds and guide the search for signatures of life beyond Earth – in our solar system and beyond.
Daniel Apai, Associate Dean for Research and Professor of Astronomy and Planetary Sciences, University of Arizona
This article is republished from The Conversation under a Creative Commons license. Read the original article.
Currently, getting a yearly COVID-19 vaccine is recommended for everyone ages 6 months and older, regardless of their health risk.
In the video announcing the plan to remove the vaccine from the CDC’s recommended immunization schedule for healthy children and healthy pregnant women, Kennedy spoke alongside National Institutes of Health Director Jay Bhattacharya and FDA Commissioner Marty Makary. The trio cited a lack of evidence to support vaccinating healthy children. They did not explain the reason for the change to the vaccine schedule for pregnant people, who have previously been considered at high-risk for severe COVID-19.
Similarly, in the FDA announcement made a week prior, Makary and the agency’s head of vaccines, Vinay Prasad, said that public health trends now support limiting vaccines to people at high risk of serious illness instead of a universal COVID-19 vaccination strategy.
Was this a controversial decision or a clear consensus?
Many public health experts and professional health care associations have raised concerns about Kennedy’s latest announcement, saying it contradicts studies showing that COVID-19 vaccination benefits pregnant people and children. The American College of Obstetrics and Gynecology, considered the premier professional organization for that medical specialty, reinforced the importance of COVID-19 vaccination during pregnancy, especially to protect infants after birth. Likewise, the American Academy of Pediatrics pointed to the data on hospitalizations of children with COVID-19 during the 2024-to-2025 respiratory virus season as evidence for the importance of vaccination.
Kennedy’s announcement on children and pregnant women comes roughly a month ahead of a planned meeting of the Advisory Committee on Immunization Practices, a panel of vaccine experts that offers guidance to the CDC on vaccine policy. The meeting was set to review guidance for the 2025-to-2026 COVID-19 vaccines. It’s not typical for the CDC to alter its recommendations without input from the committee.
Robert F. Kennedy Jr. has removed COVID-19 vaccines from the vaccine schedule for healthy children and pregnant people.
FDA officials Makary and Prasad also strayed from past established vaccine regulatory processes in announcing the FDA’s new stance on recommendations for healthy people under age 65. Usually, the FDA broadly approves a vaccine based on whether it is safe and effective, and decisions on who should be eligible to receive it are left to the CDC, which bases its decision on the advisory committee’s research-based guidance.
The advisory committee was expected to recommend a risk-based approach for the COVID-19 vaccine, but it was also expected to recommend allowing low-risk people to get annual COVID-19 vaccines if they want to. The CDC’s and FDA’s new policies on the vaccine will likely make it difficult for healthy people to get the vaccine.
Will low-risk people be able to get a COVID-19 shot?
Not automatically. Kennedy’s announcement does not broadly address healthy adults, but under the new FDA framework, healthy adults who wish to receive the fall COVID-19 vaccine will likely face obstacles. Health care providers can administer vaccines “off-label”, but insurance coverage is widely based on FDA recommendations. The new, narrower FDA approval will likely reduce both access to COVID-19 vaccines for the general public and insurance coverage for COVID-19 vaccines.
Under the Affordable Care Act, Medicare, Medicaid and private insurance providers are required to fully cover the cost of any vaccine endorsed by the CDC. Kennedy’s announcement will likely limit insurance coverage for COVID-19 vaccination.
Overall, the move to focus on individual risks and benefits may overlook broader public health benefits. Communities with higher vaccination rates have fewer opportunities to spread the virus.
This is an updated version of an article originally published on May 22, 2025.Libby Richards, Professor of Nursing, Purdue University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
The All-New 2026 Nissan LEAF Is Here — Sleek, Smart, and Ready to Lead
Nissan has officially lifted the curtain on the all-new 2026 LEAF, and it’s not just an update—it’s a total reinvention. The third-generation LEAF blends sleek, aerodynamic styling with SUV-like proportions, signaling a bold departure from the hatchback form that defined the nameplate for over a decade. This refreshed design marks a new chapter for one of the world’s most accessible and best-selling electric vehicles.
With nearly 700,000 global sales under its belt, the LEAF has long been a pioneer in the mass-market EV space. The 2026 model takes that foundation and builds upon it in every direction—design, technology, comfort, and capability. Whether you’re a loyal EV enthusiast or making the switch from a gas-powered car, Nissan’s newest electric offering is designed to meet you where you are and elevate your driving experience.
The all-new LEAF sports clean, sculpted body lines and a wide stance that echoes modern crossover aesthetics. Inside, the cabin is minimal yet inviting, focused on comfort, spaciousness, and wellbeing. A dimming panoramic roof with heat shielding adds a premium touch, while ambient lighting in 64 available colors helps set the perfect mood for any drive.
Performance Meets Practicality
Among the most impressive upgrades is a liquid-cooled lithium-ion battery offering up to 75 kWh of usable capacity—meaning more range, more freedom, and more confidence. Faster charging speeds and the inclusion of the North American Charging Standard (NACS) port with Plug & Charge capability further simplify EV ownership.
Nissan’s all-new 3-in-1 powertrain—a compact, integrated system combining motor, inverter, and reducer—delivers both efficiency and power in a sleek package. It’s an engineering advancement that supports the LEAF’s mission of providing reliable, affordable electric mobility for all.
Tech-Savvy and Feature-Rich
This isn’t just a car—it’s a rolling tech hub. The 2026 LEAF offers dual 14.3-inch displays, wireless Apple CarPlay® and Android Auto™, and Google built-in features like Google Maps. Drivers will enjoy innovative tools like the Invisible Hood View, Front Wide View, and the 3D Intelligent Around View® Monitor—making tight parking and complex driving environments far easier to navigate.
Audiophiles take note: the available Bose® Personal® Plus audio system ensures that your soundtrack is every bit as premium as your ride.
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Built to Impress, Ready for the Road
With details like flush door handles, holographic 3D tail lamps, and available 19-inch wheels, the 2026 LEAF is clearly designed to turn heads. But its mission is practical at heart: making electric driving seamless for everyday users. From its improved range to thoughtful in-cabin tech, Nissan is aiming squarely at the mainstream with this launch.
Assembly for the U.S. and Canadian markets will take place at Nissan’s Tochigi plant in Japan, where the LEAF will be built alongside the Ariya SUV.
The 2026 Nissan LEAF arrives at U.S. dealerships this fall, with availability in other global markets to follow.
Want more 2026 Nissan LEAF details or a feature breakdown?
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The once red-hot U.S. residential solar market is showing signs of cooling off—but don’t count it out just yet. A combination of rising interest rates, regulatory changes, and supply chain challenges have led to a notable dip in installations across the country. But while the short-term trend suggests a slowdown, industry experts remain optimistic about the long-term potential of rooftop solar.
📉 The Numbers Don’t Lie: Installations Are Down
According to the Solar Energy Industries Association (SEIA) and Wood Mackenzie, residential solar installations dropped by 13% year-over-year in Q1 2025, with 1,106 megawatts (MW) installed nationwide. That’s also a 4% decline from the previous quarter. This marks a continuation of the trend that began in 2024, which saw the residential sector contract in 22 states—including a five-year low in California [^1].
Analysts at BloombergNEF predict that total U.S. solar capacity will fall by 7% between 2025 and 2027, with a projected 1% annual decline through 2035 under current policy scenarios [^2].
🧾 What’s Behind the Drop?
1. Higher Interest Rates
The Federal Reserve’s continued efforts to tame inflation have made financing solar systems more expensive for homeowners. The result? Fewer consumers are willing to commit to the upfront investment, even with long-term savings in play [^3].
2. Policy Shifts in Key States
California, long considered the leader in solar adoption, rolled back its Net Energy Metering (NEM) 2.0 program in favor of NEM 3.0, which significantly reduces the value of solar exports back to the grid. Installations in the state fell sharply as a result [^1].
On the federal side, proposed cuts to the 30% Investment Tax Credit (ITC)—a major driver of residential adoption—have caused uncertainty in the market. According to Reuters, solar stocks plummeted following changes in a Senate tax bill that threatened to shrink or eliminate these credits [^4].
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3. Tariffs and Supply Constraints
Tariffs on Chinese and other foreign-made solar panels have led to price increases and reduced availability. Simultaneously, battery storage components are experiencing shortages, further delaying installations and complicating project timelines [^5].
🌤 The Long-Term Picture: A Resilient Future
Despite the headwinds, many in the industry see this as a short-term correction rather than a lasting decline. SEIA projects a return to 9% annual residential growth from 2025 to 2030, particularly if financing conditions improve and federal incentives remain intact [^1].
Additionally, solar panel prices remain historically low, hovering around $2.50–$2.60 per watt installed. That affordability, coupled with increasing demand for home electrification and EV charging solutions, makes rooftop solar an attractive long-term investment [^1].
In a recent industry survey, 78% of solar installers said they expect to sell as much or more in 2025 than they did in 2024 [^3]. And while the market is down in states like California, others—including Texas, Florida, and Arizona—are continuing to grow.
✅ Final Takeaway
Yes, residential solar is currently in a downturn. But it’s more of a recalibration than a collapse. Regulatory turbulence and financial pressures are squeezing the market, but the fundamentals—affordability, environmental benefits, and technological advancement—remain strong.
The future of residential solar will depend heavily on stable policy support, affordable financing, and continued innovation. If those stars align, the industry could see another boom in the latter half of the decade.
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📚 Sources
[^1]: SEIA/Wood Mackenzie. U.S. Solar Market Insight Q1 2025.
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