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.
Should we worry about the Earth being pulled into a black hole? Why or why not?
Introduction:
Black hole is the example of this curvature of space-time, from which nothing can escape not even the light once it enters in it. Near the surface of the black hole, the escape velocity is much greater than the speed of light. In Milky Way galaxy black holes are found in form of X-Ray Binary stars.
For any star system, to be a black hole, the mass of the star system must be greater than three times the mass of the Sun and it happens when their core contracts under the strong effect of gravity.
Black hole creates the strongest gravitational pull, so none of the body gets close to it. If any body gets too close then the pull of gravity is so strong that the object cannot escape it.
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