Skip to main content

DISTANCE: LIGHT YEARS TO MICRONS

   

   The observable universe has atleast 2 trillion galaxies in it.  The light takes 93 billion years to travel from one end to the other.

     We are living in a galaxy called milky way.  Our nearest neighbour called Andromeda galaxy is 2.5 million light years away.

     Alpha centuri is our nearest star besides our sun.  We can reach that star, if we travel in the speed of light for 4.25 years.

     The farthest planet in the solar system is Neptune, the diameter of its orbit can be taken as the width of the solar system.  The diameter is about 9 billion km.

     The sun is about 150 million km from earth.  The distance from the moon to the earth is only 384400 km.
     The international space station which is orbiting the earth; in which men lives  and does experiments, is at the height of 408 km from the surface of the earth.  The height  of the mount Everest is 8488 m or just 8 km.

     The average height of man is between 5 to 6 feet.(180cm)  We are lilliputians in the world of cosmos.  But we are giants in the world of atomic particles.
     Three grains of table salt stacked together adds upto 1 mm in length.  Hence each grain length is 0.3mm.
    The size of virus range from 20 nano meter to 250 nano meter. (10^-9 m = 1 nano meter)
     A virus is hundred times smaller than bacteria.  It can only be seen by electron microscope.

     Everything in this universe is made up of atoms.  They are million times smaller than the human air.  The sizes range from .1 to .5 nano meter.
     The nucleus which is present inside an atom occupies only a width of 10^-15 m.  The nucleus occupies only a tiny space in the atom.  Atom is mostly empty with electrons revolving here and there.  Similarly inter-planetary space is mostly empty with planets revolving here and there.  We can now understand that all the matters in the universe can easily be contained in an atom.  That atom pregnant with universe was present before the big-bang-the birth of universe.

     The longest distance can be measured using the time taken by the light waves to travel.  The very tinyest distance can be measured by using the electron waves in an electron microscope.    

Comments

Popular posts from this blog

THE EARTH, A SUPER ORGANISM

     JOIN MY COURSE: "Become a programmer in a day with python"       A man called 'love lock' (what a name) proposed a theory called Gaia theory, named after Greek Goddess.      It says, "Earth is a self-regulating organism like a human being.  The organic life in it interacts with in-organic matter and maintains atmosphere, temperature and environment".  Hence the earth is still suitable for the life to thrive.      Imagine, in a particular place, there are lot of flowers.  Some flowers are white and some are darkly coloured.  We know, white reflects light and heat while dark absorbs the same.  White flowers can thrive in hot climate.  But dark flowers requires cold climate.  The absorption and reflection balances and the environment reaches average, warm temperature at which both the flowers can co-exist.  This is the essence of "Gaia" theory.      On our earth, the oxygen constitute 20% of the atmosphere.  The oxygen level is always mai

THE PARABOLA

          A jet of water shooting from a hose pipe will follow a parabolic path.  What is the so special about parabola.    Y= x^2 Draw a graph for the above equation.  It will result in a parabola.  This parabola is also called unit parabola.  Any equation involving square will yield a parabola. Example:  Y = 2x^2 +3x+3 (also called quadratic equation)    X= 2 and -2, both  satisfies the equation 4 = X^2.  Parabolic equations always have two solutions.     Any motion taking place freely under gravity follows parabolic path. Examples:   An object dropped from a moving train,   A bomb dropped from flying plane,  A ball kicked upwards.      If a beam of light rays fall on the parabolic shaped mirror, they will be reflected and brought to focus on a point.  This fact is made use of in Dish Antenna, Telescope mirrors, etc.      Inverted parabola shape is used in the construction of buildings and bridges.  Because the shape is able to bear more weight.      A plane

DISORDER IS THE "ORDER OF THE DAY"

         Imagine a balloon full of air.  The air molecules are moving randomly inside the balloon.  Let us pierce the balloon with a pin.  The air rushes out.  Why should not the air molecules stay inside the balloon safely and ignore the little hole?  That is not the way the world works.  The molecules always "want to occupy as many states as possible".  Hence the air goes out in the open to occupy more volume.   The things always goes into disorder (entropy) and the disorder increases with time.  The above statement is what we call "second law of thermodynamics".      Consider a cup of coffee on the table. Suppose the heat from entire room flows to your cup of coffee, the coffee will boil and the rest of the room will freeze.  Freezing means bringing things to order and arrangement.  It violates the second law.  Hence it will never happen.  Hence heat must flow from high temperature to low temperature and not the other way.        The air molecules in y