Life Earth

Life Earth

Sir David Attenborough - the story behind Life on Earth - BBC

How big was the sun when the earth began and how would life survive?

The sun burns off 700 billion tonnes a second so wouldn't the sun be so huge billions of years ago when life on earth began that it would be inhospitable to life?

Over 4.5 billion years ago, the gas cloud which would become the Sun had a diameter of over 480 trillion kilometers, which is approximately 50 light years. This cloud was not dense, containing only a few thousand atoms per cubic centimeters of space. The total mass of the cloud would have been sufficient for building up several solar systems. Its temperature was that of the interstellar space, not radiating any light into the surrounding space.Later everything condensed forming the sun which we konw today.

A star like the Sun has enough fuel in its core to burn at its current brightness for approximately 9 billion years. a star that is half as massive as the Sun burns slowly enough for its fuel to last more than 20 billion years.A 10 solar mass star, a star that is 10 times more massive than the Sun, burns nearly a thousand times brighter and has only a 20 million year fuel supply.

Earth became conducive to life only because of solar radiation . the solar constant has increased since the creation of the solar system (about 4.7 billion years ago). The initial value was about 70% of what it is now. During the Carboniferous period (about 300 million years ago) it was about 2.5% less than the value today.

i think you got the answer .

Edit : spanishlady ,no place for creationism in science. earth's atmosphere is dynamic . the cloud of gases in earth's atmosphere and the cloud of gases which formed our solar system are different in terms of their physical and chemical properties.The forces of coalescence during the formation of galaxies was incredible and it took billions of years for the formation of stars,planets,etc. there is no scope for formation of new planetary bodies out of the gases in our atmosphere.
This is how it happened...

http://abyss.uoregon.edu/~js/images/nebular_hypothesis.gif

http://abyss.uoregon.edu/~js/ast121/lectures/lec24.html

http://en.wikipedia.org/wiki/Formation_and_evolution_of_the_Solar_System

http://abyss.uoregon.edu/~js/images/protoplanet_1.gif

http://www.windows.ucar.edu/tour/our_solar_system/formation.html

Edit - spanish Lady,you are raising fundamental questions.....
out of the big bang - four fundamental forces of nature formed
those forces underpin everything around us ---1.Gravity is the reason stars,planets,other celestial bodies formed ; 2.Electromagnetic force ;3 and 4 -- the nuclear forces --The Strong Nuclear Force and the Weak Nuclear Force.
--and don't think earth is the only planet in the universe where life exists.There could be billions of planets like earth in the universe.Considering the vastness of the universe it is an easy assumption .... and slowly we are getting scientific evidences.so the assumption that life exists only on the earth can become a myth soon.
coming to the point why life exists only on earth in the solar system ?
1.sun like star--not too big,not too small
2.perfect place in the solar system -- 3rd orbit in the solar system
3.presence of bigger planets in the solar system--like jupiter which pulls the rouge asteroids towards it and protecting earth from frequent impacts.
4.unique geomagnetic field ,gravitational power -- because of earth's unique core.
5.earth's unique moon --- which influences seasons,precession of earth.
6.position of solar system in the milkyway ....it is located at the edge of the milky way .
---Everything in our universe runs according to laws of physics.each galaxy orbit around a supermassive black hole at the centre of the galaxy.This is something related to gravitational force - so in effect everything in the galaxy is spinning around this black hole and each galaxy is made up of material that's been thrown outwards from epicentre of the big bang and as there's nothing to slow it down, it continues be thrust outwards, hence the reason why the galaxies are getting further and further apart.

http://www.astronomycafe.net/qadir/agalaxy.html

http://en.wikipedia.org/wiki/Black_hole

http://www.eso.org/public/news/eso0226/

Astrology and Life Choices

There were cases where a man is drawn to too much worrying about his future. Sometimes he feels like no direction at all when it comes to making decision for himself. Negativity or pessimistic approaches to their failures lead to worse case scenarios as giving up or with suicidal behaviors. But if people are motivated enough to try something positive and bestowed with choices about his/her solutions to their problems, they'll come up with the best attitude and perception about life struggles.

Cognitive knowledge from our ancient times already have the solution for this common human weaknesses. Kings and other world leaders from our history often experienced the time of depression thus giving them hard time for decision making for their people and country's welfare. Their elder advisers and magicians then offers him options for his easy picking as immediate solution for these real-time puzzles. But aside from the world leaders' wise and well-experienced consultants, they also ask for the opinions and views of other important individuals in the society such as the scientists, chemists, and also the astrologers.

Likewise with the individuals that does not have this private opulent personage, they should also have their own adviser to cope with their personal dilemmas. That's why there are public services that provides this kind of consultation. Apart from psychologist's practice of mind healing and understanding, astrologers and psychics offers a different but supernatural approach. The star signs that bespeak the individuals strong association with the universe best define the value of in dept human connection to his/her environment. Astrology also, assumes possible indication of life choices and route which could be essential to his/her current decision making and type of lifestyle.

The sun, planets, stars and other celestial bodies that provides cognitive patterns that only professional, well-experienced and knowledgeable psychics and astrologers can interpret are well-known for peculiar but logically predictable movements at the sky. Each location of these heavenly bodies is said to symbolize some influence to life Earth that could be use as a form of divination known to psychics. The common representation of this kind of study from the ancient times best describe by the expression that “as above, so below” which means the things in the sky reflect something on Earth.

After the Renaissance period, the knowledge was diverge into astronomy, a scientific conception of astrological discipline, but the strong belief of its known purpose stays. Some statistic also gives proof that people nowadays and from the past still strongly believe that relying on their astrological sign readings performs additional positiveness in their life. It apparently gives hope, motivation and perceptive options for their well-being and plans for their career and life success.

Psychics and astrology then becomes an essential thing for alternative but effective consultation for solutions and motivation. The popular identification of one's star sign or zodiac sign becomes a basic habit for most individual to know their capabilities, personality and compatibility with the society and life process. It's hard to determine who were the successful personage that based their life and career progress from astrology but sure thing they are plenty to count. Say, who knows, maybe someone would won the lottery from his/her horoscope readings today.

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