The Knowledge
Population Density: How Los Angeles Compares to New York and Chicago
How dense are America’s biggest cities? A clear breakdown of population density in Los Angeles, New York City, and Chicago—city limits vs metro areas—and why it matters.
Population Density: How Los Angeles Compares to New York and Chicago
When people think of crowded American cities, New York City usually comes to mind first. Los Angeles, by contrast, is often labeled as “sprawling,” while Chicago is seen as a middle ground. But population density tells a more nuanced story—especially when comparing city proper numbers versus metro-area density.
City Proper: How Dense Are the Cities Themselves?
Looking only at official city boundaries, the differences are stark:
New York City averages about 27,000–28,000 people per square mile, making it by far the most densely populated major city in the United States.
Chicago comes in at roughly 12,000 people per square mile, dense but far more spread out than New York.
Los Angeles, despite being the nation’s second-largest city by population, averages just 8,400–8,500 people per square mile.
This gap reflects development patterns. New York grew upward with dense apartment buildings and extensive transit. Los Angeles expanded outward with single-family neighborhoods and car-oriented planning.
Metro Areas Tell a Different Story
When the lens widens to include surrounding suburbs and commuter communities, the rankings shift:
Los Angeles Metro Area: ~7,000 people per square mile
New York Metro Area: ~5,300 people per square mile
Chicago Metro Area: ~3,500 people per square mile
This surprises many readers. While New York’s core is extremely dense, its metro region stretches across a vast, lower-density area spanning parts of New York, New Jersey, and Pennsylvania. Los Angeles, on the other hand, has a metro region that is more consistently built-up, with fewer truly rural gaps.
Why Density Feels Different in Each City
Population density doesn’t always match perception:
New York feels crowded because density is concentrated vertically and transit funnels millions into compact areas.
Los Angeles feels congested not because of extreme density, but because people are spread out and heavily reliant on cars.
Chicago balances both, with dense neighborhoods near the core and more traditional suburban sprawl outward.
Hollywood vs. Reality: How LA’s Wilshire Subway Was Really Built
Why This Matters
Density shapes:
Transportation planning
Housing affordability
Infrastructure costs
Environmental impact
For cities like Los Angeles—now reinvesting in rail, buses, and transit-oriented development—understanding density is critical. As coverage on LA Metro and urban revival continues, these numbers explain why transit challenges in Southern California differ so sharply from those in New York or Chicago.
The Big Picture
Most dense city: New York City
Most dense metro area: Los Angeles
Most balanced: Chicago
Density isn’t just about how many people live in a place—it’s about how they live, move, and interact with the city around them.
Further Reading: Population Density & Urban Development
- U.S. Census Bureau – Urban vs. Rural and Urbanized Area Density
- U.S. Census Bureau – Population and Density Data for U.S. Cities
- New Geography – Density Rankings of Major U.S. Urban Areas
- Brookings Institution – Urban and Metropolitan Policy Research
- Planetizen – What Population Density Means in Urban Planning
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The Knowledge
Metrolink Offers Fare-Free Rides for Earth Day 2026 Across Southern California
Metrolink offers fare-free rides for Earth Day 2026 across Southern California, encouraging sustainable travel and reduced emissions.
Metrolink Offers Fare-Free Rides for Earth Day 2026
LOS ANGELES — April 22, 2026 — In a continued push toward sustainable transportation, Metrolink will once again offer systemwide free rides on Earth Day, inviting commuters and travelers to leave their cars behind and explore a cleaner way to move across the region.
A One-Day Opportunity to Ride Free
On Wednesday, April 22, passengers can board any Metrolink train — including the Arrow service — without purchasing a ticket. The initiative is part of the broader celebration of Earth Day, encouraging environmentally conscious travel choices.
The fare-free program is designed to appeal to both regular riders and first-time users, particularly those navigating Southern California’s persistent traffic congestion and rising fuel costs.
Encouraging Sustainable Travel Habits
“Earth Day is a reminder that small changes, like choosing public transit over driving one day a week, can have a meaningful impact on our environment,” said Doug Chaffee, chair of the Metrolink Board.
With gas prices continuing to strain household budgets, the agency hopes the initiative will inspire more residents to consider rail as part of their regular commute.
Regional Connections Expand Access
Metrolink’s Earth Day promotion aligns with similar efforts by other Southern California transit providers. Riders can seamlessly connect to services operated by: LA Metro and the Orange County Transportation Authority, Riverside County Transportation Commission, San Bernardino County Transportation Authority and Ventura County Transportation Commission.
These partnerships extend the reach of fare-free travel across a six-county region, making it easier for riders to explore destinations without relying on personal vehicles.
Service Adjustments and Rider Tips
Passengers should note that trains will operate on a reduced weekday schedule, implemented earlier this spring. Despite the adjustment, all Metrolink lines and station cities remain in service.
For those planning a trip:
- No ticket is required — simply board the train
- Bikes are welcome, with capacity ranging from three bikes per standard car to nine in designated bike cars
- A curated destination guide highlights attractions within walking or biking distance of stations
Environmental and Economic Impact
Metrolink is also promoting its Personal Impact Calculator, a digital tool that allows riders to estimate how switching from driving to rail can reduce greenhouse gas emissions and lower fuel expenses.
A Broader Trend in Public Transit
Fare-free transit days have gained traction nationwide as agencies look to boost ridership and promote sustainability. Southern California’s expansive commuter rail network makes it particularly well-suited for such initiatives, offering a viable alternative to one of the country’s most car-dependent regions.
Bottom Line
Metrolink’s Earth Day promotion is more than a one-day free ride — it’s a strategic effort to shift commuter behavior, reduce environmental impact, and showcase the convenience of regional rail. For Southern Californians, April 22 presents a low-risk opportunity to rethink how they travel.
Source: Metrolink
https://metrolinktrains.com/news/metrolink-goes-fare-free-for-earth-day-on-april-22
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astronomy for hobbyist
I found a new meteor shower, and it comes from an asteroid getting broken down by the Sun
New Meteor Shower
Across the Earth, every night, thousands of automated stargazers are waiting to take pictures of shooting stars. I am one of the scientists who study these meteors.
Most movies and news alerts focus on large asteroids that could destroy the Earth. And your phones notifies you every few months that an object nine washing machines wide is going to just narrowly skim past. However, the small dust and rubble that enter our atmosphere daily tell an equally interesting story.
My planetary science colleagues and I use camera observations of the night sky to better understand dust, car-sized asteroids and debris from comets in our solar system.
In a study published in March 2026, I searched through millions of meteor observations collected by all-sky camera networks based in Canada, Japan, California and Europe and found a small, recently formed cluster. The 282 meteors associated with this cluster tell the story of an asteroid that got a little too close to the Sun.
Meteor formation
When a sand-sized crumb of space rock hits our atmosphere, it heats up almost instantly, vaporizing its surface layer and turning it into an electrically charged gas. The whole fragment starts to glow — this is what we call a meteor. If the object is larger, like a boulder, and brighter, it’s called a bolide or a fireball. On average, these objects hit our atmosphere going over 15 miles per second. For small dust or sand-sized objects, the whole process lasts only a fraction of a second before they completely disappear.
Most of these sand-sized fragments in the solar system originate from comets – cold, icy objects from the outer reaches of the solar system. As comets pass by the Sun, their icy components turn to gas, releasing tons of dust. This is why comets are often called “dirty snowballs” and appear fuzzy in telescopic images.
Asteroids, on the other hand, are leftovers from the early solar system that formed closer to the Sun. They are dry and rocky, and do not have the same ices that give comets their characteristic tails.
What does it mean to be active?
Astronomers call an asteroid or comet “active” when it sheds dust, gas or larger fragments. This activity is caused by some external force on the object in space, like heat from the Sun, a small impact, or when asteroids spin too fast and fly apart.
Understanding and identifying activity helps scientists better understand how these objects change over time.
For comets, sublimation of ices – when solid ice turns directly into gas, skipping the liquid phase – is the primary culprit. However, for asteroids, the reason for activity can vary greatly.
For example, NASA’s OSIRIS-REx mission, which launched into space to study an asteroid named Bennu, saw activity from its surface, with heat stress and small impacts among the leading explanations.
Other sources for asteroid activity include breakup when an asteroid spins too fast, tidal forces ripping apart asteroids during close encounters with a planet, or gas release.
Researchers most commonly search for activity using telescopes. Astronomers can look for a “tail” or fuzziness around the object. This tail is a clear sign that there is gas and dust around the body. But there is another way to search for activity – meteor showers.
Finding hidden asteroids via meteor showers
The most famous active asteroid is 3200 Phaethon. It is the parent body of the Geminid meteor shower that occurs every year in mid-December. During past close approaches with the Sun, Phaethon released vast amounts of dust and larger fragments. These morsels of Phaethon have spread out along its entire orbit over time, leading to the present Geminid meteor stream.
Each meteor shower we observe occurs when the Earth passes through one of these debris streams. So if astronomers can detect meteor showers, they can also be used to find active objects in space.
At first, debris shed by an asteroid or comet travels closely together. Imagine squeezing a single drop of food dye into a moving stream of water: Initially, the dye stays in a tight, concentrated cloud. But as it flows, the water’s swirling currents pull at the dye, causing it to spread out and fade.
In space, the gravitational tugs from passing planets act like those currents. They pull on the individual meteor fragments in slightly different ways, causing the once-tight stream to gradually drift apart until it completely dilutes into the background dust of our solar system.
The discovery of a rock-comet
In a study published in March 2026 in the Astrophysical Journal, I used millions of observations of meteors to search for recent, unknown activity from asteroids near the Earth. I found one clear cluster of 282 meteors that stood out.
What makes this discovery so exciting is that we are essentially witnessing a hidden asteroid being baked to bits. This newly confirmed meteor stream follows an extreme orbit that plunges almost five times closer to the Sun than Earth does.
Based on how these meteors break apart when they hit our atmosphere, we can tell they are moderately fragile, but tougher than stuff from comets. This finding tells us that intense solar heat is literally cracking the asteroid’s surface, baking out trapped gases and causing it to crumble. This is likely a major source of past Phaethon activity and the main reason the meteorites on Earth are so diverse.
The search for the source
Why does finding a hidden, crumbling asteroid matter? Meteor observations act as a uniquely sensitive probe that lets us study objects that are completely invisible to traditional telescopes.
Beyond solving astronomical mysteries, analyzing this debris helps us understand the physical evolution of asteroids and comets in our solar system. More importantly, it reveals hidden populations of near-Earth asteroids, which is vital information for planetary defense.
The new meteor shower’s parent asteroid remains elusive. However, NASA’s NEO Surveyor mission, launching in 2027, offers a promising solution. This space telescope, dedicated to planetary defense and the discovery of dark, hazardous, Sun-approaching asteroids, will be the ideal tool for searching for the shower’s origin.
Patrick M. Shober, Postdoctoral Fellow in Planetary Sciences, NASA
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Tech
Drones paired with AI could help search‑and‑rescue teams find missing persons faster
AI-powered drones equipped with thermal and infrared imaging are transforming search-and-rescue operations, enabling teams to locate missing persons faster and assess their condition—including signs of injury, consciousness, or life-threatening temperature changes—in real time.
Adeel Khalid, Kennesaw State University
A combination of infrared imaging, thermal imaging and color cameras on an uncrewed drone, along with an AI system to interpret the data, can help emergency responders and search-and-rescue teams locate, identify and track people who have gone missing in the wilderness. The experimental system helps responders pinpoint where a missing person is and determine whether they are hurt or even alive.
People who get lost or hurt while exploring nature can become stranded for days. Rescue teams often use drones to look for the person or signs of their whereabouts. The small drone my colleagues and I built at my lab at Kennesaw State University flies autonomously using a grid search pattern. It sends live video and images to a ground station operated by the rescue team.
When the AI system finds a person, it analyzes images to determine whether the individual is upright or lying on the ground. It segments parts of the person’s body, identifying the person’s head and the body’s position. It then zeroes in on the forehead. It extracts forehead temperature readings, pixel by pixel, from the imaging data to estimate forehead temperature. We have two papers detailing these findings accepted for the American Institute of Aeronautics and Astronautics Aviation Forum 2026 conference.
Our AI model then assesses whether the person is conscious or unconscious and identifies abnormal temperatures that could indicate heat stress, hypothermia or other physical complications, or death – all vital information for a search-and-rescue team.
In field trials we have conducted, the system has provided consistent temperature readings of the heads of volunteers from our research team who have walked out into a variety of environments, under different conditions.
Why it matters
It is critical to get accurate and timely information on the whereabouts of a missing person. The likelihood that the person will survive decreases steeply as time passes.
An AI-enhanced drone can make search-and-rescue operations significantly more efficient than sending teams of people out into the environment to search on foot, especially in poor weather conditions or under thick foliage. Rescuers who know whether a person is conscious or unconscious can also better gear up for what they need to do to retrieve the person and administer aid. Our technology could save lives.
What other research is being done
Search-and-rescue personnel use various kinds of drones, but the machines often lack the ability to positively identify humans, especially under thick foliage, in bad weather or when the person is lying down or unconscious. The AI-based technology we have developed overcomes those challenges.
Better sensors that are very lightweight, that can function at night or in rain, and can see more clearly through thick foliage could further improve our drone and drones used by others. Researchers are devising AI-powered sound recognition for detecting screams for help, advanced thermal imaging for better nighttime vision and autonomous drones that could act as first responders.
Also under development are drones that can carry heavy payloads, such as flotation devices, fly for up to 14 hours or perform real-time mapping of the ground below.
What’s next
One of our next steps is to have multiple drones fly together and autonomously coordinate search-and-rescue operations among themselves. This will allow the technology to cover a much larger area, perhaps hundreds of square miles.
We are also designing a large drone that can carry up to 110 pounds (50 kilograms) of payload and stay aloft for an hour.
The Research Brief is a short take on interesting academic work.
Adeel Khalid, Professor of Industrial & Systems Engineering, Kennesaw State University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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