NGC 3379 is an El galaxy at a distance of 14.8 Mpc that has an apparent B band magnitude of 10.65 and a central velocity dispersion of 220 kms ¹. M87 is also an El galaxy, but lies n the Virgo cluster. M87 has a central velocity dispersion of 315 km s¹ and an apparent B-band magnitude of 10.1. Assuming that both of these galaxies exactly follow the scaling relation that connects these properties, what is the distance to M87?
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.
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