The universe is so big that there must be life on other planets.Discuss the arguments for and
against this statement.
For many years,people have wondered whether we are the only living things in the universe.Some
scientists believe that there must be life on other plants because the universe is so big.However,
other scientists think that it is very unlikely that there is life on other planets,because planets
need a very specific environment for life to start.There are facts that support both sides of the
argument.
On the one hand,the universe is huge.There are billions of stars and thousands of solar systems.Many
of these solar systems have planets that go round and round a sun like the Earth.Because there are
so many planets in space,it is likely that one of these planets could have the right conditions to
have life.Recently,experts using the Kepler telescope found more than 1,200 planets in orbit around
a star and 54 of these planets are similar to Earth.Many scientists believe that one of these
planets,Kepler 22b,has the right atmosphere and temperature to have life.Even in our solar system,
scientists have found evidence of water on Mars and Titan,one of Saturn's moons.They believe that
this could mean that there is,or was,a form of very simple life on these planets.
On the other hand,a planet needs very particular conditions to have life.A planet with life would
need to have water,the right temperature and the right mix of chemicals in the atmosphere.The Earth
has the right conditions to have life,but it is very unlikely that another planet has exactly the
same environment as Earth.In addition,although scientists believe that life might exist on other
planet,we have never found evidence to prove it.A recent report from Princeton University in the USA
suggests that it is very unlikely that there is life on other planets.They believe that we don't
have enough scientific evidence to decide if there is life on other planets.
In conclusion,I do not agree that there is life on other planets.Although the universe is very big,a
planet with life needs very special conditions.Earth has exactly the right conditions for life.It is
not too hot or too cold.It has water and air and the right chemicals.I do not think that any other
planets could have exactly the same conditions as Earth.Therefore,I do not think that there could be
life on other planets.