A lot of people think about that if inhabitants of Earth are alone in  the
   universe. Not only scientists for whom this topic is connected with  their
   job. That is why we can look  at this issue from two sides:  philosophical
   and scientific.

   In medieval ages people believed that the whole universe was organized  by
   God. They thought that the sky  above them had some structures when  lived
   angles and other beings who  could be closer to  God than people. Then  it
   was really easy to interpret everything  what was strange and unknown  for
   their knowledge.

   Later it changed, because of  scientist and their discoveries. People  got
   to know that above  them was something more  than God’s space. Along  with
   that human’s mind changed. A lot of people started to wonder if God really
   existed, part of them doubted. That is why they were thinking if human was
   alone in the universe.  When they noticed  that sky was  not just a  place
   where God can exist, a lot of phenomenons was unexplained again. It had to
   be scary for  average person, but  because of that  scientists started  to
   discover new things.

   Nowadays we know a lot about cosmos. We start to learn about that even  in
   primary school. But  today average person  knows just basic  informations.
   But as we know, human  is always curious about  everything. That is why  a
   lot of people ask the question if we can think that our planet is the only
   one where some life exists.

   Everyone knows stories about  aliens who want to  attack Earth. But if  we
   think about life in another planets we  can think just about this? How  to
   understand ‘life’? Probably if we want to look for some beings similar  to
   us, we cannot find them. It would be really hard for human beings to  live
   in another planet. But scientists try to find some traces of life, of some
   small organisms.  If  they  exists, they  can  develop  themselves  during
   evolution. But even if they  exists, can we say that  we are not alone  in
   universe? In  my opinion,  it  depends on  how  we understand  ‘life’  and
   ‘being’. But maybe it would be good to know that somewhere new life starts
   to be?