Astronomy Briefly explain what evidence we can use to learn about the lives of stars even though their lives are far longer than human lives. Why do HR diagrams look different for star clusters of different ages? How do we use the diagram to determine the age of the cluster? How can we estimate how much longer the lifetime of a low-mass star is than the lifetime of a high-mass star? How do we use parallax to measure the distance to stars? Explain the inverse square law for light. If we know the distance to a star, how do we find its luminosity? If we know the luminosity of a star, how do we find the distance? What are apparent magnitude and absolute magnitude? How do they relate to apparent brightness and luminosity? What is meant by spectral type? What spectral type is the hottest? Which is the coolest? What is meant by luminosity class? What are the three basic types of binary stars?
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.
Astronomy
Briefly explain what evidence we can use to learn about the lives of stars even though their lives are far longer than human lives.
Why do HR diagrams look different for star clusters of different ages? How do we use the diagram to determine the age of the cluster?
How can we estimate how much longer the lifetime of a low-mass star is than the lifetime of a high-mass star?
How do we use parallax to measure the distance to stars?
Explain the inverse square law for light. If we know the distance to a star, how do we find its luminosity? If we know the luminosity of a star, how do we find the distance?
What are apparent magnitude and absolute magnitude? How do they relate to apparent brightness and luminosity?
What is meant by spectral type? What spectral type is the hottest? Which is the coolest?
What is meant by luminosity class?
What are the three basic types of binary stars?
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
