Why do sunspots appear dark? a. Regions of the photosphere are obscured by material in the chromosphere. b. The strong magnetic field inhibits the currents of hot gas rising from below. c. They radiate their energy into space faster than the rest of the photosphere. d. Shock waves move through the
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.
the last option is (Shock waves move through the photosphere.)
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