Problem 5. Binary star systems: Center of mass. (Palen, et. al. Chp. 10 1* Ed. Problem 65) dz m, = 3m2 The center of mass is where |the fulcrum of a balance must be. dz = 3d, FIGURE 10.15 The center of mass of two objects is the "balance" point on a line joining the centers of two masses. Study Figure 10.15 in the text (1* ed.). Where would the center of mass be located if а) т, — т,? b) M¡ = 2m,? c) 2m2 = 3m,? %3D
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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