What the definition of dark energy?
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1 point
Energy that humans cannot observe directly
Energy that has a small effect on the universe
Energy characterized by black and dark gray colors
Energy that is only emitted by glowing nebulae.
The correct definition of dark energy is: Energy that has a small effect on the universe.
The correct definition of dark energy is: Energy that humans cannot observe directly.
The definition of dark energy is "energy that has a small effect on the universe." To arrive at this answer, we can rule out the other options by understanding the concept of dark energy.
Dark energy is a theoretical form of energy that is believed to make up a significant portion of the total energy in the universe. It is distinct from other forms of energy, such as kinetic or potential energy, and is thought to be responsible for the observed accelerated expansion of the universe.
Option 1, "energy that humans cannot observe directly," is not an accurate definition because while dark energy is not directly observable, its effects can be measured through various cosmological observations and experiments.
Option 3, "energy characterized by black and dark gray colors," is not a correct definition because dark energy does not have any association with colors. It is an abstract concept related to the nature of the universe and its expansion.
Option 4, "energy that is only emitted by glowing nebulae," is also incorrect because dark energy is not associated with specific astronomical objects, such as nebulae. Its effects are observed on a much larger scale, affecting the entire universe's expansion.
Therefore, the correct definition is "energy that has a small effect on the universe." Dark energy is believed to be a repulsive force or a property of space itself that counteracts the gravitational pull of matter and causes the universe to expand at an accelerating rate. Its presence is inferred based on the observed behavior of the universe and the discrepancies between the predictions of theoretical models and observations.