25 Facts About Earth’s Atmosphere That Are Truly Majestic

Our atmosphere is one of the most protective and important parts of our planet. Responsible for sheltering us from the harsh conditions of outer space, such as solar radiation and space debris, the atmosphere is a complex structure. Though we may not give it due credit in our daily lives, the world’s attention was turned to its layers in 2013 when veteran skydiver Felix Baumgartner took a capsule up to the highest levels of the stratosphere – about 120,000 feet above the Earth’s surface – and jumped. His record-shattering free fall spawned a new wave of interest in space travel and atmospheric science (and a bit of notoriety for his sponsor, too).

In this list, we highlight facts about our atmosphere which aren’t well-known but should be for how important they are to our understanding of the world around us. We discuss how the ozone layer was formed; how deserts form in the middle latitudes; how the northern and southern lights brighten the sky with their glow; and what causes the white streaks sometimes left by planes shooting through our atmosphere. Be the smartest person at your next party with these 25 Facts About The Earth’s Atmosphere That Are Truly Majestic.

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25

Believe it or not, the sky is actually purple. As light enters the atmosphere, air and water particles absorb and reemit the light, scattering it on its way to our eyes. Since scattering prefers shorter wavelengths, the most commonly scattered color is actually violet. We think we see a blue sky rather than a purple one because our eyes are more sensitive to the color blue.

purple skySource: Colorado State University, Image: biscuitsmlp via Flickr
24

As you likely learned in science class, our atmosphere is made of about 78% nitrogen, 21% oxygen, and miniscule percentages of argon, carbon dioxide, and other gases. What you might not have learned is that our atmosphere is the only one we have discovered (besides a magnificent find on Comet 67P) which has free oxygen. Since oxygen is a highly reactive gas, it often binds with other chemicals in space. Its pure form on Earth makes the planet habitable and leads our search for life on other planets.

Atmospheric gasesSource: Space, Image: Wikipedia
23

Most people will probably get this question wrong: is there more water in the clouds or in a clear sky? Though we'd think clouds are the main depository since they drop water, most of the water in our atmosphere is invisible water vapor. For this reason, more sweat lingers on our bodies when the water vapor in the air, known as humidity, is higher.

Humidity_in_Polipoli_State_ParkSource: Colorado State University, Image: Wikimedia
22

Some global warming skeptics argue it's not a real phenomenon because their city has been getting colder. In fact, Earth's global climate is the combination of a wide variety of regional climates. So even though some areas are warming while others are cooling, on the whole, the average global climate is rapidly warming.

global-warmingSource: Space, Image: Pixabay
21

Ever wonder what causes the white streak seen after some planes shoot through the sky? These white trails, known as contrails or condensation trails, form when the hot, humid exhaust from an engine mixes with the colder outside air. Water vapor from the exhaust freezes and becomes visible, just like your warm breath on a cold day. A thin and rapidly disappearing contrail means the air at those high altitudes is low in humidity, indicating good weather. A thick, persistent contrail signals high humidity and may mean a storm is coming.

contrailSource: Scientific American, Image: Wikipedia
20

Our atmosphere has five primary layers which make life possible. The first, the troposphere, extends from sea level to about 11 miles (17 kms) up at the Equator. Most of our weather happens here due to the mixture of warm air rising and falling to form clouds and wind.

Troposphere from airplaneSource: National Geographic, Image: Wikipedia
19

The next layer is the stratosphere, reaching up to around 30 miles (50 kms) above equatorial sea level. Herein lies the ozone layer, which protects us from dangerous ultraviolet rays. Though it is higher than the troposphere, it can actually be warmer due to the energy absorbed from solar rays.

StratosphereSource: National Geographic, Image: YouTube
18

The mesosphere is the middle layer, extending to 52 miles (85 kms) above the planet's surface where temperatures hover around -180°F (-120°C). Most of the meteors which enter our atmosphere burn up in the mesosphere.

perseid meteor shower 2015Source: National Geographic, Image: Jeffrey Sullivan via Flickr
17

Considered the first part of outer space due to its thinness and the area covered (around 430 miles or 690 kilometers above the Equator), the ionosphere is where most of our satellites, including the International Space Station, are parked.

StratorsphereSource: National Geographic, Image: Wikipedia
16

The exosphere is the fifth and final layer of our atmosphere, which gets weaker and weaker as it extends away from Earth until it merges with interplanetary space. The fascinating part is that this layer can grow and shrink impressively. When the sun is calm and not compressing the layer with its solar storms, the top of the exosphere can extend from its low-point of 620 miles (1,000 kms) all the way up to 6,214 miles (10,000 kms) away from the planet's surface.

Layers_of_the_atmosphereSource: National Geographic, Image: Wikimedia
15

The trade winds operate in the warmest parts of our planet, between about 23.5°N and 23.5°S. This is why most monsoons and thunderstorms originate in these volatile regions. Just outside of them, at around 30°, there's not much wind; thus, minimal moisture from the oceans blow inland, and dry air easily sinks to the planet's surface, often resulting in large, arid deserts.

tradewindsSource: National Geographic, Image: Wikipedia
14

Because it is thinner than the first layer, the stratosphere is where most jet planes and weather balloons fly. Jets can fly faster when less restricted by gravity, and friction and weather balloons can get a better view of storms, most of which happen below in the troposphere.

SOFIA_BoeingSource: Space, Image: Wikipedia
13

Our Earth has likely lost its atmosphere a handful of times. When the planet was covered by magma oceans, massive planet-like interstellar objects smashed into the Earth. These impacts - also responsible for creating our Moon - may have been responsible for generating the planet's early attempts at an atmosphere.

Artist's_concept_of_collision_at_HD_172555Source: Space, Image: Wikipedia
12

Without various gases in the atmosphere, the Earth would be too cold for us to exist. Water vapor, carbon dioxide, and other atmospheric gases trap heat from the sun which radiates off the planet's surface, helping create a habitable climate. Known as the greenhouse effect, scientists are worried that if too many heat-trapping gases enter the atmosphere, this effect will grow out of control and create a scorching, inhospitable environment as seen on Venus.

RHS GlasshouseSource: Space, Image: Wikipedia
11

Atmospheric air samples taken after Hurricane Karl passed over Caribbean communities in 2010 revealed that up to 25% of microbes collected were related to or the same as those found in feces. Many of these microbes would have been collected by rain droplets and fallen back to Earth. (Gross.) Scientists are looking into these microbes as a possible method of disease transmission.

E coli Ag Res MagSource: Proceedings of the National Academy of Sciences, Image: Wikipedia
10

Our notorious (and critical) ozone layer was created when oxygen atoms were stirred together by ultraviolet light from the sun to bond into trios. These trios of oxygen atoms form the ozone molecules which prevent the majority of harmful solar radiation from reaching us. Despite its importance, the ozone layer was formed relatively recently after our oceans had enough life to exhale the amount of oxygen needed to build it.

minimum ozone concentrationsSource: Space, Image: NASAEarthObservatory via YouTube
9

The ionosphere is named because highly energetic particles from outer space and our Sun help form ions, creating a mild electrical layer around the planet. This layer helped reflect radio waves before satellites were launched.

northern lightsSource: National Geographic, Image: Image Editor via Flickr
8

Acid rain, which destroys entire forests and decimates aquatic ecosystems, forms in our atmosphere when sulfur dioxide or nitrogen oxide particles combine with water vapor before raining down. Both of these also occur naturally, with sulfur dioxide being produced by volcanic eruptions and nitrogen oxide coming from lightning strikes.

Acid_rain_damaged_gargoyleSource: National Geographic, Image: Wikipedia
7

Though air pressure drops as altitude increases, it can vary widely on the same spot of Earth. When the sun heats the ground, it heats the surrounding air which rises and becomes a low pressure point. Since objects move from areas of high pressure to low pressure - the big H and L signs on a weather report - nearby high pressure air rushes in to equalize the pressure.

LowpSource: Colorado State University, Image: Shutterstock
6

Lightning is such a powerful force that a single bolt can heat the surrounding air to 54,000°F (30,000°C). The rapid heating causes an explosive expansion of the nearby air. This boom creates a shock wave that becomes a sound wave we call thunder.

Pink_LightningSource: National Earth Science Teachers Association, Image: Wikipedia
5

Though the wind we feel on the surface often comes from the northern and southern poles, it's actually created around the Equator. Since sunlight strikes the planet at the Equator and nearby latitudes, most warming takes place here. (Some sunlight hits the poles, though it happens at an angle and is less energetic.) The heated equatorial air rises high into the atmosphere and moves to the poles where it sinks and heads back for the Equator.

EquatorSource: Colorado State University, Image: Wikipedia
4

The Aurora Borealis and Aurora Australis, seen at high northern and southern latitudes, are caused by reactions of ions in the fourth level of our atmosphere, the thermosphere. When highly charged particles from the sun crash into air molecules above our magnetic poles, they glow and create the magnificent light shows viewable from both Earth and space.

Ionospheric_reflectionSource: National Geographic, Image: Wikimedia
3

Skydiver Felix Baumgartner made history when he jumped out of his capsule in the upper layer of the stratosphere. Jumping out at 23 miles (37 kms) above the planet's surface, Baumgartner initially free fell in the lower-pressured atmospheric level at a rate faster than the speed of sound. As he fell, the air thickened, helping to slow him down.

felix baumgartner craftSource: Space, Image: benoitduchatelet via Flickr
2

Sunsets often look like they're burning up the sky because small atmospheric particles scatter the light, re-emitting it in orange and yellow hues. The same principle lies behind the formation of rainbows.

sunsetSource: National Earth Science Teachers Association, Image: Pixabay
1

In 2013, scientists found that tiny microbes are able to survive and thrive many miles above the Earth's surface. Collected from 5-10 miles (8-15 kms) above the planet, the microbes were found to be partly-transient and partly-local, breaking down organic chemicals which float in the atmosphere for food.

Agar_platesSource: Proceedings of the National Academy of Sciences, Image: Wikimedia


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