Indicate whether the following statements are true or false. (Select T-True, F-False. If the first is T and the rest F, enterTFFFFF). A) The three main classifications of galaxies are elliptical, spiral and prime.B) The mass of a spiral galaxy can be found from its rotational velocity. The greater the rotation, the greater the mass.C) Galaxies sometimes collide with each other.D) It wasn't until the 1920s that we knew the Milky Way was only one of many galaxies.E) Most galaxies are elliptical.F) The shorter the pulsation period of a Cepheid variable star, the more luminous it is.
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 three main classifications of galaxies are elliptical, spiral and prime.
B) The mass of a spiral galaxy can be found from its rotational velocity. The greater the rotation, the greater the mass.
C) Galaxies sometimes collide with each other.
D) It wasn't until the 1920s that we knew the Milky Way was only one of many galaxies.
E) Most galaxies are elliptical.
F) The shorter the pulsation period of a Cepheid variable star, the more luminous it is.
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