If helium keeps leaving the atmosphere, how was it not gone a long time ago?

Helium is less dense than air, which causes it to rise, but it doesn't just fly away. It is still affected by gravity. This means that it will stop rising once it is higher than everything that is more dense than it, rendering it useless. It doesn't

If humans settled on a desert planet, would the atmosphere need to be terraformed?

Humans have specific needs which can be ranked. Three in the first rank: adequate oxygen, potable water, survivable radiation and temperature. Three in the second: food supply, shelter, a large enough gene pool. Every planet humans settle on will either fit the criteria

How much damage would be sustained by an aircraft carrier upon entering the earth's atmosphere from outer space?

An aircraft Carrier isn't build with the heat shields needed for re-entry, nor is it build for flying. Besides the obvious destruction from impacting the surface, it would have massive amounts of it vaporized off from the heat of re-entry, it could possibly even

Why don't clouds fall to Earth due to gravity?

As the rule of thumb you can always(almost) assume that the things with less density float on things with higher density. And water do have less density than air, so people often think- Why the heck does it float on air?The explanation is rather simple.The cloud is not only millions of pounds of water. It has a lot

Why does the sky appear black instead of blue to an astronaut?

The sky appears dark instead of blue to an astronaut because there is no atmosphere in the outer space that can scatter the sunlight. As the sunlight is not scattered, no scattered light reach the eyes of the astronauts and the sky appears black to them.

How is NASA going to attempt to create an artificial ozone layer on Mars?

The first step is to thicken the Martian atmosphere with greenhouse gasses like CO2. Once the atmosphere is thick enough we introduce plants to convert some of the CO2 into oxygen. Oxygen is lighter than CO2 so it will tend to migrate towards the upper atmosphere. This oxygen that migrates will react with UV light emitted by the

Can we make more ozone to fill in the hole?

We make ozone near the surface by pollution and it does us no good. The ozone has to be at stratospheric altitudes to intercept the ultraviolet radiation that adversely affects life forms on the surface. To cover the area of the hole would require production of enormous amounts

Can a spaceship re-enter the Earth's atmosphere without burning up if it goes in slowly?

YES. But current technology would render it too expensive if it is an Earth made spaceship. The amount of fuel needed is estimated to be equal to what's needed to send it out to space.Answer is subject to change with technological assets availability.

Is it true that the ozone hole is decreasing?

The ozone hole has closed for this year, as of this time (2018-han-11). This year's Southern Polar ozone hole was nominal until mid period, but did manage to close early. Just two years ago, it had set a new late season record size and

Is the sky blue at night? If not, why? If yes, how?

Actually its dark blue in color at night reason is that deepness of sky with less light ... or we can say that at if its night that means we are standing on the earth's surface which is not facing sun . So the light of sun can not reach the surface on which

What's the ratio of Earth in Moon's sky to the Moon in Earth's sky?

The distance is the same and both angles are relatively small so the ratio of angles is approximately equal to the ratio of their radius:Earth's radius is about 6370kmMoon's radius is about 1737kmSo the ratio is about [math]1:0.27\approx3.67:1[/math].The Moon subtends about half a degree

What causes an orange star in the sky?

Antares, Aldeberan and Betelguse are all visible as reddish orange stats under reasonable night sky viewing conditions. They are that color because they are only hot enough to glow red or orange hot, unlike our sun which glows white hot.

How long does the ozone hole typically last?

In terms of how long each season? Then the answer is that the total column ozone in Antarctica begins to decrease at the start of September, and does not recover until the beginning of December. If one is interested in the peak ozone (the ozone between 12 and 20 km), the recovery is a little slower and it

How do white and black clouds form in the sky?

When the air near the ground warms, it starts to rise, taking the water vapor along with it.The air starts to cool as it rises higher into the sky, causing the water vapor to condense onto atmospheric dust from volcanoes, car exhaust and other sources. The resulting water droplets and ice crystals coalesce, or join together, to

Why isn't the sky magenta?

The energy captured in the photons arriving from the sun depends on the temperature of the sun. The sun emmits the most photons at roughly 550 nm. This is green light. The sky still appears blue, beacause the photons with higher energies (lower wavelengths; colors more left on the picture) slightly over proportionally affect the color of the sky,

Why isn't there rainbows in the sky when the atmosphere is 50% water?

It is not 50% water.But to answer your question, the vast majority of the water that is in the air exists as water vapor.For a rainbow to occur, that water vapor has to condense out of vapor and into actual droplets. Rain.The raindrops act as a prism to split the light into its constituent frequencies of color.Water

Today, why is the sky blue on Earth and has it always been this colour?

The sky is blue because the (more or less) white light from the sun is scattered by the atmosphere in a phenomenon called

What's the ratio of Earth in Moon's sky to the Moon in Earth's sky?

The distance is the same and both angles are relatively small so the ratio of angles is approximately equal to the ratio of their radius:Earth's radius is about 6370kmMoon's radius is about 1737kmSo the ratio is about [math]1:0.27\approx3.67:1[/math].The Moon subtends about half a degree

How to write a short note on earth's atmosphere with a neat diagram

The atmosphere is a mixture of nitrogen (78%), oxygen (21%), and other gases (1%) that surrounds Earth. High above the planet, the atmosphere becomes thinner until it gradually reaches space. It is divided into five layers. Most of the weather and clouds are found in

Are the solar winds stripping away Earth's atmosphere and if so, at what rate?

Stripping by the solar wind is probably not a terribly big effect for the Earth's atmosphere, since Earth's magnetic field generally deflects the solar wind particles, which are charged, in the magnetosphere.The

If the solar system had an atmosphere, how loud would the sun be on Earth?

You could figure it out using Sound Intensity and Sound Level The sound intensity I in units of W/is defined in terms of I = (dP)^2/(2*density*v). So you'd need to find or estimate the dP of sound waves at the sun's

What is the main reason why Earth has an atmosphere?

Long, long, ago, when the solar system was just a bunch of cosmic space dust, the space dust started gathering together.Suddenly, boom we have a bunch of masses of flaming matter. (That's not how it actually worked but for the sake of simplicity let's just go with that)Now all

If the sky is blue, why isn't sunlight blue?

Sunlight contains those wavelengths which we perceive as blue, in addition to all the others in the visible spectrum. Those

How the earth looks from space if there is no atmosphere on earth?

The Earth probably would look generally brownish or reddish, like Mars or Mercury

Is it possible to pump water into the atmosphere (using the space lift) to create a better environment on earth?

No, for some reasons:Increases in humidity, ends up putting more water vapor into the ozone layer, depleting ozone.Spraying water into the air, is done, to cool the body of water down (spray heads on the sides of pools), and to aerate the body of water (ponds, to allow fish to live in hotter water). It does not

Why is the atmosphere of the sun warmer than its surface?

S. U. N.Logically, one would expect that the temperature decreases as we move away from the core, towards the surface, similar to the lessening of warmth as we move away from a writhing flame. Surprisingly, this is not the case. The sun's atmosphere burns at a temperature of 100 to 400 times more than its surface!

What would a 'planet making machine' need to create an atmosphere and make it susceptible for humans on Europa?

See the Wikipedia article, Terraforming.  As a general process, the, "primary stage of ecosystem creation is usually restricted to the initial seeding of microbial life.  As conditions approach that of Earth, plant life could be brought in,  and this will accelerate the

How can planets move in a vacuum without an atmosphere?

the motion of the planets, or anything else for that matter is not dependent on the medium they move through, or lack thereof in the case of a vacuum.If you need proof of this, get a glass jar, put a marble in it then

How is the Atmosphere heated?

Sunlight does nearly all the heating of Earth's atmosphere.The second highest source is heat leakage from the Earth's interior.Waste heat from human activities contributes a negligible fraction.Trace amounts of heat are added by meteorites burning up when they enter the air at high speed (

How many human made satellites can orbit the earth?

None.If the satellite finds itself in the atmosphere, it would stop being a satellite just after it burned to a crisp.Satellites live outside that, and because that outside goes up quite a long way, there's room for a great many orbiting objects.

If there was no ozone layer, what would happen to us humans since we need it?

The Earth's ozone layer, absorbs and blocks the majority of the sun's UV radiation. Without this barrier in place, all of the radiation would reach Earth, damaging the DNA of plants and animals, like us humans. Skin cancer rates would soar, but we might not even live long enough to experience that cause of death.

Why does the sky appear blue in colour on a bright day?

As sunlight enters the earth atmosphere it encounters air molecules and dust particles. As the dimension of most of the molecules and dust particles is of the order of the wavelength of blue light so blue color scatters more on encountering those particles. This scattered blue we see as a blue sky.For more information please read Rayleigh scattering.

Is it true that the ozone hole is decreasing?

The ozone hole has closed for this year, as of this time (2018-han-11). This year's Southern Polar ozone hole was nominal until mid period, but did manage to close early. Just two years ago, it had set a new late season record size and

Why does a clear sky at night sometimes have no stars and sometimes have uncountable stars?

Barring any solipsistic interpretations, the stars are there whether you see them or not. However, conditions for you to see them are not always equal. Your eyes can only see when there is light and a clear path for the light to reach them, and even then only down to about

Will we ever be able to build a method of leaving the Earth's atmosphere without the use of jet fuel propulsion?

As it is now, we aren't using jet fuel (JP4 or other kerosene derivatives) propulsion for any voyage that requires an isolated fuel and oxidizer for thrust, namely rocket technology, and that is also leaving the planet, either for low Earth

If intelligent life emerged on a methane-based atmosphere, how would they make fire without toasting the planet/moon's atmosphere?

In a methane based atmosphere, oxygen cannot exist in large quantities precisely because it would oxidize (burn) the methane. If you were to have a local concentration of oxygen, it would probably cause a local fire. On earth, such fires (in reverse) can be seen in swamps as decomposing organic matter produces methane,

What would happen to the space shuttle if it lost all of its heat tiles before entering the Earth's atmosphere?

We don't really have to guess - when Columbia got damage to just one of her leading edge thermal protection panels - the result was that parts of the wing structure overheated and failed - and the entire shuttle ended up scattered in tiny pieces

What causes an orange star in the sky?

Antares, Aldeberan and Betelguse are all visible as reddish orange stats under reasonable night sky viewing conditions. They are that color because they are only hot enough to glow red or orange hot, unlike our sun which glows white hot.

What is the actual colour of the sky?

The sky is a dynamic system whose color changes with the weather, the time of day. the level of pollution, and other factors.Asking for the real color of the sky is like asking how much potential energy you really have. The correct answer changes over time and depends on context.Some people

Why doesn't space crafts burn when going through the earth's atmosphere?

Because they built and controlled this way. Upon ascending, the crafts accelerate only a certain grade, which the aerodynamical external layer could survive. It costs more fuel, but secure the survival of the whole bunch.During descending the craft must follow a strict course. If descent faster than the plan, the heat shield burn through.

If space is a vaccum then why doesn't it pull the atmosphere of planets?

No, Earth do leaks some part of atmosphere Each Day, although you might not realize it or think about it, Earth does continually lose some of its atmosphere to space. This loss occurs in the upper atmosphere, over billion-year time scales.Every day, around 90 tonnes of material escapes from our planet's upper atmosphere and streams out into

If humans disappeared tomorrow, how long would it take the atmosphere to return to normal levels?

I don't want to answer the question, but I want to point out that this kind of thinking is very dangerous - thinking about mass genocide to change atmosphere composition by few hundredths of percent. The atmosphere doesn't have

How do white and black clouds form in the sky?

When the air near the ground warms, it starts to rise, taking the water vapor along with it.The air starts to cool as it rises higher into the sky, causing the water vapor to condense onto atmospheric dust from volcanoes, car exhaust and other sources. The resulting water droplets and ice crystals coalesce, or join together, to

The hole in the Ozone is closing. Is this going to happen quickly enough?

In addition to the CRISTA - SPAS mission, there's this,

Why is space colorful from spots on Earth but outside the atmosphere it just looks black?

I think people kinda misunderstood your question or maybe they got it right and I'm the one who got it wrong.I think you meant why pictures of earth taken from space don't show stars and space is pitch black. The reason for this is

How far is the atmosphere from earth?

The atmosphere actually starts at the very surface of the Earth, and covers all of Earth down to its surface. The atmosphere has no defined upper limit, however. It slowly thins out into outer space. The exosphere, the highest point in the atmosphere,