The presence of Dark Matter was theorized due to the curve of the data that the motion of the stars around the central core of our neighboring galaxy (Andromeda) has been approximately flat rather than decreasing at large distances. Which fundamental concept in this chapter helped us in understanding this phenomena? a.) Orbital speed b.) Escape speed c.) Law of equal areas d.) Law of elliptical orbits
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 presence of Dark Matter was theorized due to the curve of the data that the motion of the stars around the central core of our neighboring galaxy (Andromeda) has been approximately flat rather than decreasing at large distances. Which fundamental concept in this chapter helped us in understanding this phenomena?
a.) Orbital speed
b.) Escape speed
c.) Law of equal areas
d.) Law of elliptical orbits
What happens to the magnitude of the force between two objects with the same mass if we double the distance between them?
a.) The magnitude of the force will be doubled.
b.) The magnitude of the force will be quadrupled.
c.) The magnitude of the force will be halved.
d.) The magnitude of the force will be 1/9 of its inital magnitude.e. E
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