What is the reason that scientists proposed the existence of the mysterious Dark Energy?
a
The rate of expansion of the Universe was increasing instead of slowing down or remaining the same
b
The amount of light generated by galaxies is too much for the energy of their stars
c
The energy of stars are higher than what can normally be produced with fusion
d
Galaxies generate dark energy by the darker colors lights coming off of them
The correct answer is:
a) The rate of expansion of the Universe was increasing instead of slowing down or remaining the same
Scientists proposed the existence of Dark Energy when they observed that the expansion of the Universe was accelerating rather than slowing down, as expected. This discovery indicated the presence of an unknown form of energy, called Dark Energy, that is driving this accelerated expansion.
The correct answer is (a) The rate of expansion of the Universe was increasing instead of slowing down or remaining the same. Scientists proposed the existence of dark energy to explain the observed phenomenon that the expansion of the Universe is accelerating. This observation contradicted expectations based on the known properties of matter and energy. Dark energy is considered an unknown form of energy that permeates space and is responsible for this accelerating expansion.
The correct answer is a) The rate of expansion of the Universe was increasing instead of slowing down or remaining the same.
Scientists proposed the existence of dark energy to explain the unexpected observation that our Universe's expansion is accelerating. Initially, it was believed that the expansion of the Universe should be slowing down due to the gravitational pull of matter. However, through observations of distant supernovae in the late 1990s, scientists discovered that the expansion is actually speeding up.
To understand the reason behind this accelerated expansion, scientists hypothesized the existence of an unknown force called dark energy. Dark energy is believed to be a form of energy that permeates space and has negative pressure. It is thought to counteract the gravitational attraction between matter and drive the expansion of the Universe.
It is important to mention that options b) and c) are not accurate explanations for the existence of dark energy. The amount of light generated by galaxies and the energy of stars are separate phenomena that are not directly related to the presence of dark energy. Additionally, option d) is not a valid reason as dark energy is not generated by the colors emitted by galaxies.