Object Mass Radius Person 70 kg 1E-3 km Моon 7E22 kg 1.7E3 km Sun 2E30 kg. 7E5 km Earth 6E24 kg 6E3 km VY Canis Majoris BE31 kg IE9 km White Dwarf Star 13 M(sun) GE3 km Neutron Star 3 M(sun) 10 km Compute the surface gravity and escape velocity of each of the objects in the ahove table.
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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