Rigel is a bright star in the night sky - its apparent magnitude is 0.12. Venus, when it is at it’s brightest, can have an apparent magnitude of -4.9. When this happens, what is the flux of Venus relative to the flux of Sirius? Use the fact that the absolute magnitude of Rigel is -7.8 to calculate its distance from Earth.
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.
Rigel is a bright star in the night sky - its apparent magnitude is 0.12. Venus, when it is
at it’s brightest, can have an apparent magnitude of -4.9. When this happens, what is the
flux of Venus relative to the flux of Sirius?
Use the fact that the absolute magnitude of Rigel is -7.8 to calculate its distance from
Earth.
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