Dark Energy

Introduction
Energy, its what moves us, what keeps us going, what gives us Aloha. Energy is what gives things without Aloha The Power to work via physical or chemical means. Energy can be potential and kinetic. Energy is what makes The World go round. All these things have energy, but what energy Powers The Universe? 
Dark Energy
The Power of Universe and its expansion in the largest scales is Dark Energy. We cannot see it nor can we feel it, but it is there. It was there in the beginning and will be there if there is an end. Dark Energy was discovered when Supernovae measurements were being made, however the expansion was not at a constant rate. The expansion was not constant, it was expanding. The recognition of this expansion being something new than the regular forms of energy or matter was needed since these Classical forms of energy could not explain the acceleration rate of the expansion. Hence this new form of energy would be known as Dark Energy. Dark Energy is very thorictical since we cannot straight up observe it like we can a star, a planet or now even a black hole. As of now, Dark Energy is believed to be not very dense and uniformed. The only force it is known to mess with is Gravity. The Four Forces from weakest to strongest is Gravity, Electromagnetism, Weak Force and Strong Force. 
Evidence
Now of course, with any theoretically non-concrete claim, there needs to be strong evidence in order for it to even be considered real or believable. There are three main pieces of evidence for the existence of Dark Energy. The first is, what i explained earlier, The theoretical need for such an energy to be present and existent in order for the explanation of the accelerated rate of expansion. There needs to be something to explain why this manner occurs. Now we all know that in the past, this hasn't alway been an effective tool in predicted why something happens the way it does. Some examples of this are, one, in Ancient China, the peoples believe that a Solar Eclipse was a Dragon eating The Sun. They use to yell at it to go away, and it did. Except, The Whole Dragon covering The Sun wasn't true. We know now that this occurs via The Moon blocking The Sun's light from The Earth.  Another example is that child sacrifices would bring good fortune to a people. This despicable event had nothing to do with whether the crops would grow well or that there wouldn't be a huge flood or not. We now know these things came about due to nature and its climate and weather and etc. This first piece of evidence isn't the strongest but good thing for us, there two more pieces of evidence for the existence of Dark Energy. The second composition of evidence is distance measurements and there red shift that implies that The Universe has expanded more it the second half of its life. Red Shift, occuring to the Oxford dictionary definition is "The displacement of spectral lines toward longer wavelengths (the red end of the spectrum) in radiation from the distant galaxies and celestial objects." This Red Shift growing longer in wavelength form is evidence of an unseeable force causing it to do so. The third and final main piece of evidence for the existence of dark energy are measures of large-scale wave-patterns of mass density in The Universe. The evidence for dark energy may not be as strong the evidence of black holes are, but the evidence is still strong nonetheless. 
Conclusion
Just because we cannot see something does not mean it isn't there. Atoms for example for the longest time not observable, they still exist though. Can we see the wind? Can we see needle in a haystack at first glance, can we see our consciousness? My point being that, we do not always need to directly observe something to know that it is there. If you have dog and you are looking at them and then look away for 3 seconds, does your dog not exist for those three seconds you not observing its presence? Now there is a theory that states that the answer is Yes and No at the same time, but will dive into that theory in a way far in the future article. However, to put it in simple terms, yes, your dog is still there for those three seconds and yes, the wind does exist. Remember, we can never be  too sure about something, for even our own eyes and memories can deceive us. We must look at the evidence and use reason, logic and science to determine our beliefs in what exist, otherwise we could still be screaming at Sun-Eating Dragons.