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.
![**Question: Based on the graph, what is the approximate mean luminosity of a Cepheid variable star with a period of 5 days?**
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**10 days?**
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*Note:* For this question, please refer to the relevant graph that illustrates the relationship between the period of Cepheid variable stars and their mean luminosity. The graph typically shows a periodic light curve indicating the brightness variation over time, with the x-axis representing the period in days and the y-axis representing the luminosity. To estimate the mean luminosity for specific periods, locate the corresponding points on the graph and determine the y-value associated with those periods.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ffc81a842-acef-41db-9757-8c9675d70f2a%2F80dad431-e966-4e8d-acf4-2122321b12a5%2Fh271i1_processed.jpeg&w=3840&q=75)
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