Dark energy - Grade: 8 PDF

Preview

Summary

Essay on Dark energy...

Description

RUNNING HEAD: DARK ENERGY

1

Dark Energy Student’s name

Institution affiliation

RUNNING HEAD: DARK ENERGY

2

Dark Energy Introduction The world was assumed to be static in the early years of 1900 as the universe followed the theory of force of gravity (Polarski, 2013) Further studies were done which led to the discovery of a kind of cosmic repulsive force by albert Einstein. Scientist also realised that the measured quantity of matter in the world’s mass-energy was relatively low hence some unknown “missing component” recognized as cosmological constant was needed to cover for the deficit. Discovery of the existence of the cosmological constant was referred to as the dark energy. The study seeks to answer questions on dark energy discovery, its properties and its implications to the evolution of the world. Briefly discuss the observations that have led to the conclusion that dark energy exists and what properties it possess. According to Raichle (2010) dark energy is believed to be particles which exist in the world but cannot be seen directly. The matter has mass however it does not absorb any electromagnetic radiation. Hence the difficulty in discovering anything about the dark energy, however scientists have come up with various observations which have proved the existence of dark energy. The observations include; looking at its effects on visible objects which accounts for the unexplained movement of stars within the galaxies. NASA’s Chandra X-ray observation, revealed a cluster of galaxies known as the Abell 2029 (Copeland, 2014). Peebles and Ratra(2013, April). Dark matter does not interact electromagnetically and it is not observed directly. However, they consist of four properties namely; sterile neutrinos, Axions, primordial black holes and WIMPS which are least massive supermmetric particles (Peebles &Ratra, 2013). b)

Describe what the existence of dark energy implies to the evolution (fate) of the

universe.

RUNNING HEAD: DARK ENERGY

3

Dark matter is still a mystery in the world hence unveiling its mysteries will greatly assist in understanding evolution. Scientist will gather significant information regarding the origin of the universe,the gravitational pull of dark matter as well as how the world functions. The existence of dark energy will further reveal whether the world is closed, flat or open. Further,the study of dark energy will assist in understanding how the galaxies spin yet they ought to be torn apart by the force since they are held together by a great amount of gravity (Abbott, Abdalla & Aleksić, 2016).

References

RUNNING HEAD: DARK ENERGY

4

Abbott, T., Abdalla, F. B., Aleksić, J (2016). The Dark Energy Survey: More than dark energy - an overview. Monthly Notices of the Royal Astronomical Society, 460(2), 1270–1299 Copeland, E. J. (2014). Dynamics of dark energy. In AIP Conference Proceedings (Vol. 957, pp. 21–29). Peebles, P. J. E., &Ratra, B. (2013, April). The cosmological constant and dark energy. Reviews of Modern Physics. Polarski, D. (2013). Dark energy. In AIP Conference Proceedings (Vol. 1514, pp. 111–117) Raichle, M. E. (2010). The Brain’s Dark Energy. Scientific American, 302(3), 44–49....