Indicate whether the following statements are true or false. (Select T-True, F-False. If the first is T and the rest F, enter TFFFFF). A) The nearest large spiral Galaxy, similar in size to the Milky Way, is the Andromeda Galaxy (M31). It is located about 2 million light years from Earth. B) On very large scales, matter in the Universe is distributed in clumps and voids. C) RR Lyrae and Cepheid variable stars are used to measure the distance to nearby galaxies. D) Distances to most stars in the Milky Way are measured by parallax. E) If we find an O type star in our galaxy, it must be in the disk. F) The disk of the Milky Way galaxy is about 1,000,000 light years in diameter.
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.
- Indicate whether the following statements are true or false. (Select T-True, F-False. If the first is T and the rest F, enter TFFFFF).
- A) The nearest large spiral Galaxy, similar in size to the Milky Way, is the Andromeda Galaxy (M31). It is located about 2 million light years from Earth.
- B) On very large scales, matter in the Universe is distributed in clumps and voids.
- C) RR Lyrae and Cepheid variable stars are used to measure the distance to nearby galaxies.
- D) Distances to most stars in the Milky Way are measured by parallax.
- E) If we find an O type star in our galaxy, it must be in the disk.
- F) The disk of the Milky Way galaxy is about 1,000,000 light years in diameter.
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