Edwin Hubble established the existence of separate, distant galaxies when he found __________ stars in the __________ Nebula and used them to measure its distance. He did this work with the world’s largest telescope (at the time) at the _____________. Hubble classified galaxies on the basis of their shapes, into spirals, ____________, and irregulars. Later, working with his assistant, ___________, he showed by using __________, that most of the galaxies were moving away from us, and that the further away a galaxy was, the ___________ it was moving away.
Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.
Edwin Hubble established the existence of separate, distant galaxies when he found __________ stars in the __________ Nebula and used them to measure its distance. He did this work with the world’s largest telescope (at the time) at the _____________. Hubble classified galaxies on the basis of their shapes, into spirals, ____________, and irregulars. Later, working with his assistant, ___________, he showed by using __________, that most of the galaxies were moving away from us, and that the further away a galaxy was, the ___________ it was moving away.
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