Increasing Temperature -- Greenhouse Effect

                               Greenhouse Effect

                                         

     The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what is would be without its atmosphere.

Greenhouse effect are mainly caused by some gases known as greenhouse gases. 

Greenhouse Gases - A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infraed range.

It causes the greenhouse effect. The primary or main greenhouse gases in Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide and ozone, chlorofluoro-carbon, carbon monoxide, sulphur dioxide.

Without greenhouse gases, the average temperature of Earth's surface would be about -18' C (0' F), rather than the present average of 15' C (59' F).

The atmospleres of Venus, Mars, and Titan also contaion greenhouse gases.

Instead of greenhouse gases, human activities, mainly the burning of fossil fules and clearning of forests, have strengthened the greenhouse effect and caused global warming.

Global Warming - Global warming, also referred to as global heating, is a long-term rise in the average temperature of the Earth's climate System, an aspect of climate change shown by temperature measurements and by multiple effect of the warming. 

Global Warming

      In short way there all tropics are realeted to each other, "when the greenhouse gases increase then the surface temperature increases, which causes a effect called greenhouse effect and when greenhouse effect causes then the surface warm and it called global warming".

Galaxy

                              Galaxy

The word galaxy is derived from the Greek word galaxias which means literally "milky".

Galaxy

A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.

We all, our planets, our solar system, also in galaxy known as Milky Way Galaxy. 

Milky Way Galaxy

Our galaxy "Milky Way" also derived from that Greek word (galaxias) which means "milky", a reference to the Milky Way.

There are numbers of galaxy in the universe but all galaxy have supermassive giants in there centers called black hole.

Black Hole

Our galaxy the Milky Way galaxy also have a black hole in its center, known as Sagittarius A*, which have a mass of four million times greater than the Sun.

Sagrittarius A*

Neighbor Galaxy - The nearest or neighbor galaxy of our galaxy is Andromeda Galaxy, which is 2.5 Million Light Year far from our galaxy.

Andromeda Galaxy

1. What is between two galaxies?

Answer - The space between galaxies is filled with a tenuous gas

(the intergalactic medium) having an average density of less than one atom per cubic meter. 

     

           Nomenclature Or Naming of Galaxies

Tens of thousands of galaxies have been catalogued, but only a few have well established names, sach as the Andromeda Galaxy, the Maagellanic Clouds, the Whirlpool Galaxy, the Sombrero Galaxy, the Triangulum Galaxy, the Milky Way Galaxy.

These name of galaxy was named one the name of scientist who discovered them.

1. Milky Way Galaxy

2. Andromeda Galaxy

3. Maagellanic Clouds

4. Whirlpool Galaxy

5. Sombrero Galaxy

6. Triangulum Galaxy

Universe

                                      Universe

The most and important things in universe is Gravity (Gravitation).

Gravitation - Every body in the universe attracts every other body with a force called force of gravitation.

Gravitation is the force of attraction between any two bodies in the universe.

                * What is Gravity?

Answer - Gravity is special case of gravitation.

If one of the attracting bodies is the earth,then gravitation is called gravity.

Gravity is the force of attraction between the earth and any object lying on or near its surface.

Gravitational Field - Two bodies attract each other by the gravitational force even if they are not in direct contact.

This interaction is called at a distance.It can be best explained to the field concept,

1. Every mass modifies the space around it.This modified space is called gravitational field.
2. When any other mass is placed in this field,it feels a gravitational force of attraction due to its intractionwith the gravitational field.

The sapce  surrounding a material body within which its gravitational force of attraction can be experienced is called its gravitational field.

 --bhbj --------