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Are quasars moving away from us at the speed of light since from the big bang as they are 13 point 7 light years away?
AyushS
The farthest known galaxies / quasars are at a distance of over 40 billion light-years, and are moving away from us faster than the speed of light. Locally, nothing can go faster than the speed of light, and in their "own space", they don't. But in this case, it is "space itself" that is expanding. The Wikipedia article on "metric expansion of the Universe" gives a more detailed explanation on this topic.
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∙ 11y ago
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How do quasars affect the universe?
Quasars are some of the most distant and luminous bodies we can observe. Since we measure them to be incredibly far from our own galaxy, in the order of billions of light-years, astronomers believe that they are several billions of years old as their light would have taken that long to travel to us. Astronomers think that they may be young galaxies as the appear to be incredibly bright balls of accreting gas that probably have black holes at their cores. Because quasars give off characteristic pulses of light at regular intervals, astronomers use them as "standard candles" to measure the redshifts (how quickly they are moving away from us) of other extremely distant objects.
What emits extremely large quantities of energy?
Quasars emit more energy than anything else in the universe. Quasars are massive black holes at the cores of some galaxies, swallowing matter and stars and ejecting them out collimated bipolar jets of matter and radiation which stretch out hundreds of thousands of light years. Since there are quasars in galaxies close by, these indicate the evolution of our universe.
Can quasars be mistaken for stars since they're distant galaxies with an active nucleus at the center of it?
No they cannot be mistaken for stars as stars can be seen by the human eye & Quasars cannot.
Are there thousands of other galaxies?
There are an estimated 130 billion galaxies, and most all of them are undiscovered since we have only mapped a very tiny fraction of the whole universe. As we look further in space, we see back in time. On the outskirts of the universe, we can see galaxies with quasars, some of the first galaxies, their quasars in their centers have probably burned out by now and they are just regular galaxies, but we see them as they were billions of years ago with their quasars burning, their light is just now getting to us.
What propels light?
Similar to any moving object, once it is moving, it doesn't need anything to "propel" it. It will just continue moving on its own, since that's its natural tendency.
Can light go faster then the speed of light?
Since light is made of light, whatever speed it goes at is what we call the speed of light. So we'll always see light moving at exactly the speed of light, at least in that particular medium.
If tachyons travel faster than light does this mean they also travel backwards through time?
time's arrow is past- present- future(p-p-f), so imagine that a tachyon(T) is emitted from point "a" and is headed towards you at point 'b' then it is going to pass you to finally reach at point 'c'. now the normal progression of events in time ( p-p-f),and (a-b-c) in space. however taking light as the mean by which we can see things, then you will see the events occurring in a reversed chronological order, since T is faster than light then you will see its image at point "b" before its image at point "a', imagine it as a race between the light photons and the 'T', at point 'a' photons starts the race with 'T', T will normally win the race and reach point 'b' before the photons; at point b another photon hits the T in order to get you its image, it will have a closer starting point for your eyes, thus you will see 'T' at point 'b' before 'T' at point 'a', so in space you will think it is moving from 'b' to 'a', ( note that you will never be able to see 'T' at point 'c' , since 'T' is faster than light , light will never capture its image). this is why it seems to be moving backwards through time,i.e, (f-p-p).
What happened when you placed Elodea at the light compensation point?
Since the light compensation point occurs when the oxygen produced by photosynthesis is equal to the oxygen required for cellular respiration, oxygen will have a slope of 0.
Does work done in moving a charge from infinity to a given point involves any acceleration?
No, work done in moving a charge from infinity to a given point does not involve any acceleration. Work is defined as the product of force and displacement, and in the case of moving a charge, the force is constant along the path. Since acceleration is the rate of change of velocity, and there is no change in velocity in this case, there is no acceleration involved.
Why does moving the decimal point in the divisor and the dividend when dividing by a decimal work?
Moving the decimal point one place to the right is the same as multiplying both, he numerator and the denominator by 10. That is, you are effectively multiplying by 10/10 which equals 1. And since multiplication by 1 does not change the result, it is OK to do that. Similarly, moving two palces to the right is multiplying by 100/100. Similarly moving left.
What does light consist of and why are they moving?
Light is pure energy. Apparently in packets called photons. Since it (light) has no mass, it always travels at the "speed of light" (which varies depending on the medium its traveling through). It's motion is the only measurement of its energy content.
What was Claude Monet's interest in water?
Since light was the main point of the impressionists, water reflections were particularly interesting.
