What distinguishes one spectrum (and one spectral class) from another? What is a

Question

What distinguishes one spectrum (and one spectral class) from another?

What is a spectrometer and how does one work?

How are the elements present in a star determined from the spectral lines?

What type of objects did Hubble study to formulate his famous ‘Law’?

What two quantities did Hubble measure for these objects?

How did Hubble measure these quantities?

What does Hubble’s Law say?

What does Hubble’s Law imply about the universe?

What is Hubble’s constant?

How is Hubble’s constant related to the age of the universe?

Explanation / Answer

The colors of various spectrum distinguishes from each other, Each spectrum is divided by absorption lines.

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