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Earth's AtmosphereEarth's atmosphere is one of its five major systems, consisting of gases that envelope the planet from the ground to more than 10,000 kilometers (6,214 miles) above the surface. It serves as the arena where the sun's uneven heating is circulated across the planet by weather, while insulating against significant temperature changes between day and night. By trapping thermal energy via the greenhouse effect and protecting against most harmful debris and radiation from outer space, the atmosphere sustains suitable conditions for large segments of life on Earth.
The current atmosphere is not Earth's first. Planetary models suggest leftover hydrogen and helium from the formation of the solar system once surrounded the planet but were lost to space due to insufficient gravity. Heavier molecules released by volcanic eruptions, such as water vapor, carbon dioxide, and ammonia, later formed a new atmosphere. Photosynthesis in ancient microorganisms and reactions involving solar radiation then turned these chemicals into the most abundant gases in the modern atmosphere: nitrogen (78%) and oxygen (21%).
Although the atmosphere stabilized into its five layers following the production of these gases, it continues to evolve through interactions with the sun and other Earth systems. This includes ozone depletion and increases in greenhouse gas concentrations caused by human activity.Explore Earth's Atmosphere
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About 99% of Earth's atmosphere is made of nitrogen and oxygenAt 78% and 21% respectively, the two elements are followed by argon with almost 1%. Trace amounts of other molecules, including greenhouse gases such as methane and carbon dioxide, and particulate matter such as dust and pollen, make up the remainder of the atmosphere's contents. GeeksforGeeksWhy the edge of Earth's atmosphere varies depending on which property is consideredAs the distance from Earth's center increases, the planet's gravitational force weakens, causing it to gradually lose its ability to retain gases at the farthest edge of its atmosphere—the exosphere. At a height of approximately 200,000 kilometers (124,000 miles)—halfway to the Moon—the exosphere has so little density that it is indistinguishable from interstellar space. West Texas A&M UniversityThe importance of the mesosphere, the coldest part of Earth's atmosphereAtmospheric gases are dense enough in this region to begin burning up debris traveling toward Earth's surface, producing meteor showers, or shooting stars. Although we normally associate decreasing temperatures with increasing altitude, temperatures increase beyond the mesosphere layer due to the absorption of high-energy ultraviolet radiation and X-rays. Royal Belgian Institute for Space AeronomyHow the loss of Earth's atmosphere would cause oceans to boil at freezing temperaturesMany phenomena requiring air pressure, from the flight of birds and aircraft to the act of breathing, would no longer be possible. Because sound travels through vibrating air molecules, the loss of the planet's atmosphere would also create a silent environment. Even during daytime hours, the sky would resemble a clear night sky. What IfUnderstanding why suction cups rely on Earth's atmosphere to workWhen pressed against a surface, air is squeezed out of a sealed volume, causing the internal pressure to drop below the surrounding atmospheric pressure, and this imbalance creates the "sticking." For this reason, astronauts do not use suction cups or related technologies to stay on spacecraft during spacewalks. Encyclopedia BritannicaExplaining why Earth's atmosphere doesn't crush us, despite weighing 11.24 quintillion poundsGravity pulling down on over 5.1 quintillion kilograms of gases surrounding Earth's surface produces an atmospheric pressure of 15 pounds per square inch (101,325 Newtons per square meter). However, since air surrounds objects, the forces from opposing air pressures normally cancel each other out, eliminating any detectable weight. Live ScienceHow Earth's atmosphere constantly loses the universe's lightest elements to spaceThe masses of hydrogen and helium are too small for these gases to be held by Earth's gravitational force, particularly when these atoms are given energy from collisions with high-speed particles from the sun. Although the planet loses a meter-wide balloon's worth of hydrogen every second, it will still take billions of years to deplete the planet of this element. MinuteEarthView the transparency of Earth's atmosphere and how it blocks most forms of lightThe gases that make up Earth's atmosphere block most harmful forms of electromagnetic radiation from reaching the planet's surface, except for some ultraviolet light. Their transparency to radio waves means this form of light can reach Earth's surface, which is why most radio telescopes are ground-based rather than space-based. NASAExplore Earth's atmosphere and what its layers contain in this interactive adventureIn this interactive, users can move from Earth's surface up through its atmosphere, exploring the natural phenomena found in each layer, including atmospheric rivers, auroras, and meteor showers. Artificial structures such as weather balloons and the International Space Station can also be found on the adventure. NASAExcluding water vapor, greenhouse gases make up less than 1% of Earth's atmosphereAlthough carbon dioxide, methane, nitrous oxide, ozone, and most fluorinated gases account for only a minority of the planet's greenhouse effect due to their lower concentrations, they are more effective at trapping thermal radiation. While water vapor condenses within two weeks, other greenhouse gases linger in the atmosphere for years on average. NASAThe weight of Earth's atmosphere is equivalent to a 33-foot deep, global oceanBecause air is made up of gas molecules with mass, it is not weightless. On the planet's surface, we are effectively living in what is the equivalent of the bottom of an invisible ocean of these particles pressing against us, just as water molecules do when we are submerged. 1440 DailySpace telescope development was driven by a desire to bypass Earth's atmosphereThe most important figure in the effort to create what would become the Hubble Space Telescope was Lyman Spitzer, who first proposed a telescope in orbit in 1946. The nearly 50-year endeavor led to space-based observatories, which are not limited by Earth's atmosphere absorbing or distorting most wavelengths of light. American Museum of Natural HistoryView a diagram of Earth's atmosphere, which is composed of five layersStarting from the surface, the troposphere is home to Earth's weather, followed by the stratosphere, which houses the ozone layer, and the mesosphere, which burns up most debris from space. Above these layers lies the thermosphere, where auroras are produced, and the exosphere, which lacks a clear outer boundary as it fades into outer space. UCAR Center for Science EducationScientists have proposed using lasers to push space trash into Earth's atmosphereSuch projects would allow most debris to burn up and no longer pose a risk to active satellites, telescopes, and astronauts on space stations. Enacting these plans would require substantial investments from private and governmental space agencies and overcoming international laws that prevent the removal of another country's space equipment. 1440Breaking down the ionosphere, which reflects radio waves from Earth's surfaceMade up of ionized regions within the mesosphere and thermosphere, the ionosphere contains charged particles produced when solar radiation knocks electrons free from atoms and molecules in the atmosphere. Before satellites, radio operators would bounce signals off these regions to wrap around the planet and extend the range of transmissions. University Corporation for Atmospheric ResearchA breakdown of Earth's atmospheric layers, including why it can get colder or hotter with altitudeGases in the troposphere—the atmosphere's lowest layer—cool with increasing height as they get farther from the thermal energy emitted by Earth's warm surface. In the next layer—the stratosphere—ozone is increasingly heated by the sun's ultraviolet radiation with height. Because cooler air sinks and hotter air rises, the cooler troposphere and hotter stratosphere form a natural boundary keeping Earth's weather in the lowest layer. StarTalkHow chaos transformed single forecasts into collections summarized through probabilityEarth's atmosphere is an example of a system whose evolution depends strongly on the initial conditions when numerically simulated for weather forecasting. Because it is impossible to know the properties of every single air molecule, meteorologists employ ensemble forecasting, in which multiple trials with slightly different initial conditions are run, and the probability of specific events is determined from all the results. Royal Meteorological SocietyCoronal mass ejections and solar flares produce the most extensive aurorasThe most intense geomagnetic storms are produced when massive clouds of plasma—ionized gas—are expelled from the sun's upper atmosphere and interact with the Earth's magnetic field. These storms expand where auroras are bright enough to be seen to regions farther from the poles, particularly during peak periods of the sun's 11-year intensity cycle. Kurzgesagt – In a NutshellCan you really survive on Mars? What science fiction gets wrong about off-world living SpaceThe construction of LIGO needed to compensate for Earth's curvatureAcross the 4-kilometer (2.5-mile) arms, the height of Earth's surface falls by almost a meter, preventing the lasers traveling within the arms from meeting the mirror at the end of each. Concrete slabs built beneath the arms help keep them level and provide structural support against seismic vibrations. LIGO Lab | CaltechResearch shows Venus would be hotter if some of its CO₂ were swapped outThe planet's atmosphere—whose density is 92 times that of Earth's—is 96.5% carbon dioxide. Since these molecules all capture the same subset of infrared radiation emitted from Venus's surface, radiation outside this range escapes, demonstrating the increased impact that diverse greenhouse gas composition has on planetary warming. Indiana UniversityThe greenhouse effect was discovered by analyzing Earth's temperatureUsing mathematical techniques developed to analyze heat transfer, Jean-Baptiste Joseph Fourier showed that Earth should be significantly cooler if solar radiation were the only contributor to its surface temperature. By considering that the atmosphere could amplify the sun's warming effect, he formulated what became known as the greenhouse effect. The Irish TimesExoplanet atmospheric gas patterns may indirectly provide evidence for lifeWhen searching for life beyond the solar system, scientists first determine the range of distances from a star that liquid water—believed to be essential for life—can be found. Within this habitable zone, the presence of specific molecules in an exoplanet's atmosphere—detectable through spectral analysis—can indicate the presence of living things known to produce those compounds. The ConversationBy 2030, experts estimate a 1 in 1000 chance of a plane being hit by space debrisAs more satellites and spacecraft are launched, the rate of space debris re-entering Earth's atmosphere, including those that do not burn up completely, increases. International space agencies and air traffic control systems will need to coordinate to develop standardized methods and technical solutions to prevent and minimize future crisis scenarios. Space.comShooting stars, or meteors, are fragments of asteroids and cometsThese objects range in size from a grain of sand to a pebble and originate from the breaking apart of rocky asteroids due to collisions or from the debris of icy comets' tails. As they enter Earth's atmosphere, they burn up, creating streaks in the sky called meteor showers. NASAEarth's water may have come from comets, asteroids, or its magma oceanBefore Earth's atmosphere formed, any liquid water would have boiled off, preventing the accumulation of water early on to create today's oceans. Planetary scientists continue to debate whether this water was delivered later from comet or asteroid collisions or via reactions between iron oxide in Earth's molten surface and hydrogen gas from the planetary nebula. Short WaveRadio waves are used in broadcasting, weather radar, telecommunications, and GPSIts ability to bend around obstacles and reflect off the ionosphere—an electrified layer of Earth's upper atmosphere—allows this type of light to travel long distances without damaging living things due to its low energy. MRI scanners, WiFi, and Bluetooth technologies are also applications of this form of light. Dynamic Engineers, Inc.Variations in the energy of light force the use of multiple telescopesJust as Earth's atmosphere allows the sun's visible light to pass through while blocking other harmful radiation, telescope mirrors and other optics can only reflect, absorb, or transmit certain types of light. Detectors also utilize semiconducting materials that react to specific energies of light, thereby preventing a one-telescope-fits-all solution. Astronomy.comThe informal boundary between the Earth and outer space lies within the atmosphereLocated approximately 100 kilometers (62.1 miles) above Earth's surface, the Kármán line serves as the approximate location where air density is too low to support aerodynamic lift to keep an aircraft airborne. Beyond this height, thrust is needed to propel objects through the air. WorldAtlasA scientist debunks theories for why aliens might invade EarthWhile TV and films offer common tropes for why aliens would invade Earth, many of those reasons aren't actually feasible. For example, a species with technology advanced enough to allow it to travel between planets likely doesn't need to enslave flawed humans to carry out its labor. Literary HubThe sun emits a continuous stream of plasma known as the solar windComposed of charged particles—electrons and ions—the solar wind is deflected around the Earth by the planet's magnetic field. More powerful solar storms, known as coronal mass ejections, are short-lived but produce huge clouds of plasma that disrupt technology upon reaching Earth. The ConversationSpace trash forced astronauts on the International Space Station to take shelterAn inactive Russian satellite broke up into nearly 200 pieces, prompting astronauts on the space station to take shelter in a docked spacecraft and a capsule that could be used to escape in case of emergency. The GuardianIn 2023, there were nearly as many payloads in LOE as trackable pieces of debrisIn 2021, the European Space Agency estimated that more than 130 million space debris objects larger than 1 millimeter were in low Earth orbit, though only about 22,000 were being tracked. As of late 2025, the tracked total exceeds 49,000. Our World in DataInteractions between solar storms and Earth's magnetic field create aurorasSolar storms on the Sun's surface produce clouds of electrically charged particles, some of which make their way to Earth. Those trapped in Earth's magnetic field accelerate toward the north and south poles, colliding with atmospheric atoms and molecules in the process, which produces light. Royal Museums GreenwichShooting stars are streaks of light produced by meteoroidsAs these rocks enter Earth's atmosphere at high speeds, friction causes them to burn up, briefly leaving streaks of light. The color of these fireballs can be used to determine the composition of the meteoroid, if it does not reach the ground and become a meteorite for analysis. Chemistry For Your LifeMartian skies and sunsets resembled Earth's hundreds of millions of years agoEvidence suggests that Mars has had a thicker atmosphere, which included greenhouse gases, and a magnetic field in its past, resembling Earth's current composition. After losing its magnetic field—the protection from solar wind—the atmosphere and its associated atmospheric phenomena gradually disappeared. Be SmartClimate tipping points are irreversible changes to Earth's environmentEarth's natural systems have prevented these events—including the mass death of coral reefs, loss of the Amazon rainforest, and shutdown of Atlantic currents—but scientists believe they are unlikely to withstand continued stressors from climate change. The New York TimesThe cycling of carbon via tectonic activity may have facilitated life on EarthPlates sinking into Earth’s mantle pull carbon from the surface, helping stabilize the atmosphere and climate by removing greenhouse gases from volcanic eruptions. At the same time, magma is a significant contributor of heavy metals and other crucial minerals for life to the surface. Live ScienceResearch suggests a 95-kilometer-wide (59-mile-wide) asteroid impact could boil the Earth's oceansEven a 1-kilometer-wide (0.62-mile-wide) asteroid can trigger earthquakes and tsunamis on impact with oceans. The overwhelming majority of asteroids that reach Earth are much smaller and burn up in the atmosphere before reaching the ground. SciShowPilots are familiar with multiple types of turbulence, each with varying severityEach type is defined based on what disrupts airflow in the atmosphere, including thunderstorms, mountains, and wakes produced by aircraft that previously took off. Pilots classify turbulence as light, moderate, severe, or extreme based on how it affects aircraft movement. Pilot InstituteCritical organic molecules have been found on an asteroidNASA's OSIRIS-REx mission returned samples containing amino acids and nucleobases from asteroid Bennu. Without Bennu having been destroyed—as is common for asteroids that enter Earth's atmosphere—its samples serve as a time capsule of the solar system's early chemistry. NASAJuno has revealed Jupiter’s polar cyclones, complex atmosphere, and diffuse coreThe continent-sized cyclones at Jupiter’s poles generate strong winds and ammonia-laden storms. The spacecraft has also collected data on Jupiter’s unique magnetic field, which resembles a blend of Earth’s and Uranus/Neptune's. Astronomy MagazineView the 55 ECVs used to describe Earth's atmospheric conditionsEssential climate variables include physical, chemical, and biological variables that meaningfully contribute to Earth's climate and how it changes with time. Many of these variables influence one another through feedback mechanisms across Earth's atmosphere, hydrosphere, cryosphere, biosphere, and geosphere. World Meteorological OrganizationSee a lunar eclipse share the night sky with the Milky WayPhotos taken at the Cerro Tololo Inter-American Observatory in Chile in March 2025 captured a blood moon and the Milky Way galaxy within the same field of view. The moon appears red from the bluer parts of its reflected sunlight being scattered by Earth's atmosphere. Space.comScientists investigate Earth's interior by studying seismic wavesScientists investigate Earth's interior by studying seismic wavesBelow Earth's atmosphere lies the crust, which extends to the Mohorovičić discontinuity between five and 20 miles below Earth's surface. Below the crust lies the mantle, the liquid-metal outer core, and the solid inner core, which surpasses 5,200°C. Space.comEarly Earth lifeforms likely made energy via mineral reactions, not sunlightEarth's initial atmosphere was filled with carbon dioxide, methane, and water, with most oxygen locked away in the rocky crust. Over time, bacteria evolved to slowly release that oxygen into the atmosphere by breaking down rock. American Society for MicrobiologyHumans have existed for just 0.004% of Earth’s historyBorn from the remains of the molecular cloud that birthed the sun, Earth experienced planetary-scale collisions, asteroid impacts, and lava seas. Life became possible after the planet cooled and formed a thin crust, atmosphere, and oceans. Kurzgesagt – In a NutshellNikola Tesla's original laboratory was recognized as a historical site in 2018Beginning in 1901, the Wardenclyffe Tower was built on Long Island, New York to transmit electrical power through Earth's atmosphere. The project was abandoned before becoming operational due to limited funding, and was demolished for scrap in 1917 to help pay off Tesla's debts. 1440You are 65,000 times more likely to be struck by lightning than to be hit by space trashIn 2023, about 1,500 pieces of space junk fell to Earth, with most consisting of payload fragmentation debris. The vast majority that falls back to Earth burns up before reaching the surface, making it three times less likely to be struck by space trash than by a meteorite. Deutsche WelleThe history of Earth's breathable atmosphere, made possible by photosynthetic bacteriaBetween 3.2 and 2.8 billion years ago, threadlike microorganisms called cyanobacteria began consuming available water vapor, carbon dioxide, and sunlight to produce oxygen. However, molecules released from Earth's interior by volcanoes consumed this oxygen via chemical reactions, preventing it from accumulating until volcanism had sufficiently decreased about 2.4 billion years ago. Ars Technica
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