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what is hindi names of all planets ? for eg. mars :- mangal
DIFFERENCE BETWEEN PLANETS AND SATELLITES
give 5 uses of artificial satellites???
why does pole star appears to be stationary in the night sky whereas all other stars appear to be moving from east to west?????????????
Global Warming is the increase of Earth's average surface temperature due to effect of greenhouse gases, such as carbon dioxide emissions from burning fossil fuels or from deforestation, which trap heat that would otherwise escape from Earth. This is a type of greenhouse effect.
Earth's climate is mostly influenced by the first 6 miles or so of the atmosphere which contains most of the matter making up the atmosphere. This is really a very thin layer if you think about it. In the book The End of Nature, author Bill McKibbin tells of walking three miles to from his cabin in the Adirondack's to buy food. Afterwards, he realized that on this short journey he had traveled a distance equal to that of the layer of the atmosphere where almost all the action of our climate is contained. In fact, if you were to view Earth from space, the principle part of the atmosphere would only be about as thick as the skin on an onion! Realizing this makes it more plausible to suppose that human beings can change the climate. A look at the amount of greenhouse gases we are spewing into the atmosphere (see below), makes it even more plausible.
The most significant greenhouse gas is actually water vapor, not something produced directly by humankind in significant amounts. However, even slight increases in atmospheric levels of carbon dioxide (CO2) can cause a substantial increase in temperature.
Why is this? There are two reasons: First, although the concentrations of these gases are not nearly as large as that of oxygen and nitrogen (the main constituents of the atmosphere), neither oxygen or nitrogen are greenhouse gases. This is because neither has more than two atoms per molecule (i.e. their molecular forms are O2 and N2, respectively), and so they lack the internal vibrational modes that molecules with more than two atoms have. Both water and CO2, for example, have these "internal vibrational modes", and these vibrational modes can absorb and reradiate infrared radiation, which causes the greenhouse effect.
Secondly, CO2 tends to remain in the atmosphere for a very long time (time scales in the hundreds of years). Water vapor, on the other hand, can easily condense or evaporate, depending on local conditions. Water vapor levels therefore tend to adjust quickly to the prevailing conditions, such that the energy flows from the Sun and re-radiation from the Earth achieve a balance. CO2 tends to remain fairly constant and therefore behave as a controlling factor, rather than a reacting factor. More CO2 means that the balance occurs at higher temperatures and water vapor levels.
Human beings have increased the CO2 concentration in the atmosphere by about thirty percent, which is an extremely significant increase, even on inter-glacial timescales. It is believed that human beings are responsible for this because the increase is almost perfectly correlated with increases in fossil fuel combustion, and also due other evidence, such as changes in the ratios of different carbon isotopes in atmospheric CO2 that are consistent with "anthropogenic" (human caused) emissions. The simple fact is, that under "business as usual" conditions, we'll soon reach carbon dioxide concentrations that haven't been seen on Earth in the last 50 million years.
Combustion of Fossil Fuels, for electricity generation, transportation, and heating, and also the manufacture of cement, all result in the total worldwide emission of about 22 billion tons of carbon dioxide to the atmosphere each year. About a third of this comes from electricity generation, and another third from transportation, and a third from all other sources.
This enormous input of CO2 is causing the atmospheric levels of CO2 to rise dramatically. The following graph shows the CO2 levels over the past 160 thousand years (the upper curve, with units indicated on the right hand side of the graph). The current level, and projected increase over the next hundred years if we do not curb emissions, are also shown (the part of the curve which goes way up high, to the right of the current level, is the projected CO2 rise). The projected increase in CO2 is very startling and disturbing. Changes in the Earth's average surface temperature are also shown (the lower curve, with units on the left). Note that it parallels the CO2 level curve very well.
why does the pole star appear stationary in the skly ,whereas all other stars appear to move from east to west???
Why do we see different phases of the moon
What is the importance of the 'Pole star'?
why planets do not collide while revolving around the sun
why do stars appear to twinkle????
what are the differences between star and a shooting star ???
IS THERE A SHORT WAY TO REMEMBER THE 9 PLANETS
what is saptarishi?
In world map the maximum distortion is at the:
A>tropic of cancer b> equator c>tropic of capricon d> poles
some scientists claim that there was life on mars. is it really true? or its all nonsense.
why earth and other planets revolves around the sun they can go everywhere in the univers?please explain it in detail?
What is air pollution , name 4 air pollutants, sources & effects?
how can we locate pole star with the help of ursa major
why do we classify the sun as a star?
what is big bang theory?
What makes the star give out vast amount of energy?
what is pole star? why does it appears to be stationary? plzz give me the answer in short
what is the full form of WWF?
How is a constellation different from a star?
What's the difference between meteor, meteorite and meteoroid?
Why does moon changes its shape every day
can we see planets with our naked eye
write a short note on Phase of Moon ?
why pluto is not considered as a planet
Stars have their own light or not or they absorbs sunlight?
What is the difference between asteroid comet?
what is god particles . Please give in detail.
name the planets that were discovered after the invention of telescope.
11. A satellite of mass m revolves around the earth of radius R at a height x from its surface. If g is the acceleration due to gravity on the surface of the earth, calculate the orbital speed of the satellite.
why do stars give out heat and light?
Differentiate between galaxies and constellations in points
Tell some differences between stars, planets and satellites ?
Why do the Lines of Latitude decrease when moving towards the Pole
what is big bang theory? how our earth formed
Can anyone explain me what a blackhole is.
why does pole star not seems to move
Q243)Why was it necessary to define a new unit to measure distances in the universe?What is this unit?
Name a star which appears stationary from the Earth. In which constellation is it situated?
Which property of the pole star makes it very useful for sailors?
Why does a star appear to rise four minutes earlier in the sky everyday than the previous day?
1. A star is light years away from the earth. what does it mean ?
2. Why do stars look ery small although these are huge heaenly bodies ?
3. The moon is not a star but still shines . give reason
4. The planet mercury does not have an atmosphere. How does this affect the temperature on its surface ?
5. Write two uses of remote sensing satellites ?
6. Why does planets not collide with each other during their journey around the sun ?
7. Why does the tail of a comet always point away from the sun ?
8. Why does the pole star appears stationary in the sky, where as all other stars appears to move from East to West.
WHY IS EARTH KNOWN AS "UNIQUE PLANET" ?EXPLAIN
why is the distance between stars expressed in light years? what do you understand by the statement that a star is eight years away from the earth
in the sun the nuclear reactions that occur produce heat and light. hydrogen atoms combine to form helium atoms. But the hydrogen atom does not contain any netrons. when two hydrogen atom combine, than how does a helium atom form with neutrons in it's nuleus?
Why do all stars in the sky appear to move from east to west?
Why is the distance between stars expressed in light years? What do you understand by the statement that a star is 4.3 light years away from the earth?
what is difference between meteors and meteorites?
Is there a black hole in center of milky way galaxy?
why,only earth is a planet which supports life????why not other planets??????
plz explain 'Drawf Planets' in detail.
what is the relation between light year and kilimeter?
I urgently need a slogan on Mysterious universe
do all the stars in the sky moves?explain
why do scientists predict the existence of life on mars?
what conditions make life possible on earth ???
If I am 13 years old how many times have I revolved around the Sun.
why can we only see one side of the moon????
why is it so that whenever a comet is seen then natural disasters are likely to occur?
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