True or False: The instantaneous value of a velocity vs. time graph is the slope of the corresponding position vs. time graph. Trụe or False: If you calculate the area under the line of a velocity vs. time graph it equals the distance the object moved. True or Ealse: The instantaneous slope of a velocity vs. time graph is the acceleration at that moment. True or False: If you calculate the area under the line of an acceleration vs. time graph it equals the velocity of the object.
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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