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TIME Episode - 27

By VCP -
Image
  Zeeshan and Advik returned back to me and enquired about my health.  They hesitated to see my parents.  They both begged pardon from my parents and Aalya.  My parents interrupted them kindly, "Please don't feel sorry.  You have apologized multiple times.  Actually, we must thank you for informing us and admitting my son to the hospital.  Whatever happened is happened, nothing is in our hands.  Today, my son is alive because of you both.  We are very thankful for you and your father". "My son told me everything about you and your brother.  He always updates us about his research.  Even though he was in a critical situation, he left a message for us.  Only my family members can understand the code language.  My father used to teach him.  It is easy and precise.  I can understand the entire situation very well."  Zeeshan praised my parents with an emotional tone, "So kind of you.  Thank you so much for not calling the police." I interrupted, " What
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The Universe is full of stars, then why the space is black?

By VCP -
Constellation, Cosmos, Dark, Exploration
    

   Why the space is black?   There is no one, to pay the electric bill or there may not be any source to give light in space.  This may be a funny answer.  But the actual reason it isn't.  

      To know the answer, we should know about Doppler effect and Red shift.

     To know the Doppler effect in simple way, just consider, you standing in a road side and an ambulance crossing you.  So many of them may get experience in that, the siren sound is higher when the ambulance moving towards us and the sound get lower and lower, when it is moving away from us.  
     The reason behind is the wavelength of the sound.  If the wavelength is longer the sound get lower and if the wavelength is shorter the sound get higher.  What is wavelength?  The distance between two waves (If you throw a stone in a water, you can observe the waves).  

     In this picture, you can observe the man standing towards the ambulance receiving high sound due to shorter wavelength.  And woman away from the ambulance receives low sound due to longer wavelength.  Now, you all may get what is Doppler effect.

     The same concept applied in red shift, but we will discuss about light instead of sound.
     We know that the space get expanding and the objects around us moves away from us.  So the stars are also moving away from us, so the wavelength get longer.  The light having longer wavelength, it can't visible to our human eye(Human can't see).
     Light from the distance source(galaxy, star and so on) reaches us in the form of infrared waves.  The Human eye's can't really see it due to longer wavelength.  So the space is dark.
Location: Tamil Nadu, India

Comments

  1. Unknown22 July 2020 at 08:51

    The black spaces between stars shows how far other stars are, because their light has not reached us yet. That also gives us a hint, as to how infinite is infinite.

    ReplyDelete
    Replies
    1. Thinking Warriors23 July 2020 at 10:19

      Yes, that's correct .... Our Earth is not infinity old ... It is about 15 billion years old. That means ,we can only see the object as far as the distance light can travel in 15 billion years.....

      Delete
    2. Thomas 'PointedEars' Lahn15 August 2020 at 13:32

      This comment has been removed by the author.

      Delete
    3. Thomas 'PointedEars' Lahn15 August 2020 at 13:34

      Terra (Earth) is ≈ 4.5 billion years old. The approximate age of our universe, which is much older than Terra, is 13.8 billion years.

      We can see objects that are farther away than 13.8 billion or even 15 billion light-years now because, while their light has been underway, including towards us, our universe has expanded in all directions and has carried them farther away (from us) than where they had been when they first emitted light.

      Delete
    4. Thinking Warriors3 September 2020 at 03:15

      Yep, thanks for your extra information...

      Delete

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