Only a Jeeva which is a spark of Param Aatma only can feel emotions and has a wisdom.
If the Jeeva takes birth in earth, it will get a body that will suit the conditions on earth. This body is termed as Sthoola Shareera (Material Body).
If the same Jeeva takes birth in Swarga (Indra’s Planet) it will get a body that suits Deva lokas conditions. This body is free from hunger, disease, sweat. 
If a Jeeva takes birth in Gandharva lok (planet), it will get Gandharva lokas body. 
There are 11 lokas or higher planetary of whose consciousness is also higher than one another.

Jeevathma or Jeeva emerges from the JeevVishishtaBrahma which was in its “Beej roop” or cocoon.
It just shows itself (prakat) on a particular time and space. It neither been created not it can be destroyed.
There are infinite Jeevathmas.

Mainly a Jeevathma is brought into the material world by goddess Maaya. Then based on its karma, it is sent to higher planets and be there until all its 
sathvik karmic fruits are sorted out. As soon as the Jeeva enjoyed all its fruits then it is thrown back to material planet. 
It will be allotted lower species body anywhere from ant to elephant and sometimes the Jeeva has to take birth in almost 84 lakhs of earth species until it gets human body.

If the Jeeva’s Karmas are in negative direction, it is taken to lower level planets called Narak. There are different Narak mentioned in Garud puran.

For a Jeeva to take birth, it MUST have a body which will obey the laws of that planet or space.
An amphibian has a kind of body that can dwell in both land and water.
A fish has ha body that can live in water, and like wise is the human body.

A human body is meant to be most superior body (even if it sweat and stinks right after an hour taking bath) because, only in this body
the Karma is been counted. And no other bodied Jeeva’s Karma may it be Dev lokspecies or Narak lok species the Karma is 0. The species in Swarg
planet being superior to humans also longs for Human body because they can perform KARMA.

Coming to the question Why we are here? 

We all are here only in search for Aananda. The definition of Aananda: Unlimited Increasing Happiness for Infinite period. 

As told earlier, there are 11 higher dimensional planets or worlds. 

1. MrityuLok (Earth)
2. PithraLok
3. Manushya GandharvLok
4. GandharvaLok
5. Ajanak GandharvLok 
6. Ajanak Manushya GandharvLok
7. DevLok 
8. Ajanak DevLok
9. DevGandharvLok
10. Ajanak DevGandharvLok
11. BrahmaLok

All these planets or Lokas are under influence of goddess Maaya, the power of supreme personality godhead.
Within these planets there exists mainly LUST, ANGER, JEALOUSY.

Of course the well knowledged Jeevathma with superior wisdom could travel within these Lokas with a blink of an eye. They could even
change their body to suit the condition of these planets just like we change our clothes. They did this not by time machine but with Taposhakthi
or Punya phala. These Jeevathmas when they travelled from higher planets to earth, we call them Dev or the entity which is equivalent to lord (krishna) but not lord himself. Yes now they can be termed as ALIENS.
Example: Sanakadi Mahapurush; Naarada Muni. and many many more.

The planet where the lord resides is called a VAIKUNTA planet, the most superior one and infinitely vast. Once a Jeevathma is taken to 
Vaikunta planet, they say there is no return back. Unlike any other planets, where the Jeevathma is thrown again and again into the MrithyuLok planet
Vaikunta planet is the only planet where once Jeevathma gets entry then it will not have to return back to inferior planets.

Why Sri Krishna?

Sri Krishna is Swayam Bhagawaan. 5000 years back when kurukshetra war was fought in Dwapar Yug, Lord Krishna said that unless and until
Jeev completely surrenders himself unto me, I will never lift MY MAAYA from that jeev. Once the Jeev completely surrenders to Krishna the jeeva
gets entry to Vaikunta planet where there is no influence of Maaya and no return to material planet; so no rebirth.

Why Jeev longs for Aananda or Haapiness? Because Jeev is a spark of Sri Krishna and Aananda is the alternate name of Sri Krishna.
Sri Krishna himself is full of Aananda and his abode is Vaikunta.

its true wot  u  say.. who  we  worship  as  god may only be the creator  of intellegent life like ourself  ,but not  the entire universe… its bout time our  human  brains(which even now do not  understand how  it  works) stop  imagining that technology what  it  cant  understand  is  divine or attributed to GOD

500  back there was  no  electomagnetism… no  electric bulbs ..but im  sure as  the  way we  have progressed from  those days.. we  ultimately  arrive at   a scientific age  wher  the working of  the  universe and  our exsitence  here  is explained scientifically.. and not my  magic or  miracles.. it make take  a millenium or  so..   but  i beleive  that mankind  will be  able to reach a  level of scientific awareness  that  may explain the  working of  the  universe as per or  WAAAYYY  beyond  m theory  or branes..

I totally enjoyed your blog. But dude there is God . and as far as science is concerned it just needs proof about every thing its just difficult to prove every thing you can feel air but cant see it so are most of the things .If our brains have developed the way you said it developed then why cant people sense natural disaster before it comes. God is there and those scientists who says that GOD is a myth why in the name of science cant they give a straight answer as where did our life start from and from which form did it start from

About GOD-ALIEN connection, it is very much possible that we have worshipped them as GODs, as at that time we were not civilized enough to know thier true self.
Cheers
Rozen

We already met here in the blog now
sure, will meet some time later in person too

Research on Sri Yukteshwar Giri’s work.
http://www.binaryresearchinstitute.org/bri/research/papers/history_and_time.shtml

Self Leviation Research by Vincent J. Daczynski
http://www.amazingabilities.com/amaze8a.html

Please visit my blog at http://indianempire.wordpress.com/ and provide your valueble comments. Thank you very much for being such a great encouragement to number of youth like me.

Yet Another Indian