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.
Parallax Effect: If an observer measures the change in the position of a nearby star relative to the background of farther stars over six months, while the Earth moves in its orbit, the observer can then calculate what?
Group of answer choices
The distance of the nearby star
The distance from the Earth to the Sun
The size of Earth compared to the size of the Earth's orbit
The time to the end of the world
The size of the nearby star.
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