1. The big dipper is part of A. URSA major B. CANIS major C. AQUARIUS D. LIBRA 2. The appearance of this constellation in the East is the first sign of spring A. SCORPIO B. LEO C. PAGASUS D. VIRGO 3. What is the red star in the constellation orion? A. SIRIUS B. BETELGEUES C. RIGEL D. LEO 4. In the United States when can you see the orion in the evening? A. Summer B. winter C. Spring D. All year rounds

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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.