Youtube comments of (@TheSecretsoftheUniverse).
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It's because of relativistic beaming, a phenomenon that happens when something is moving really, really fastโnearly the speed of light. It's related to the way we perceive the light from that moving object. Let me explain from scratch.
When an ambulance with its siren on is moving towards you, the sound seems louder and higher pitched, but as it moves away, it becomes quieter and lower pitched. This is because sound waves get compressed (squished together) as the ambulance moves towards you, and stretched out as it moves away.
Now, let's imagine something similar, but with light from a star or a quasar. If that star or quasar is moving towards us at a significant fraction of the speed of light, the light waves will get compressed, just like the sound waves from the ambulance. This means the light will shift towards the blue end of the spectrum, because blue light has shorter, more compressed wavelengths.
Now, finally, let's talk about quasar jets. These are streams of particles (like electrons and protons) that are shot out from near the black hole at the center of the quasar, traveling at near-light speeds. This is where relativistic beaming comes into play. If one of these jets is pointed towards Earth, the light and other radiation from that jet will be beamed, or focused, in our direction. Because of the compression effect I described earlier, this jet will appear much brighter to us than if we were viewing it from a different angle. This effect is so strong that it can make the jet appear brighter than the rest of the quasar, even though the jet is actually just a small part of it.
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1. Newton's theory of light, that light is made up of particles, lost its importance in the 19th century (1801-1900) because there was no experiment that supported it. On the other hand, with Young's double slit experiment, Huygens' wave model could be proved. However, in 1900 and the years that followed, black body radiation, photoelectric effect, pair production, and the Compton effect could only be explained with particle theory of light. So today we say that light has dual character.
2. A sinusoidal wave is a type of wave that has a position-time relation just like the sine and cosine functions. Its amplitude continuously changes with time, oscillating between two fixed values.
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Sorry, but that's wrong. The Hindu concept of Navgraha is based on seven celestial bodies combined with two celestial points, and not nine planets. They include Surya (Sun), Chandra (Moon), Buddha (Mercury), Shukra (Venus), Mangal (Mars), Guru/Brihaspati (Jupiter), Shani (Saturn), Rahu (the ascending lunar node), and Ketu (the descending lunar node).
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