What the definition of dark energy?
*
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 humans cannot observe directly."
The 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 understand this concept, let's break it down.
Dark energy refers to a theoretical form of energy that is thought to make up a significant portion of the total energy content of the universe. It is called "dark" because it does not interact with light or other electromagnetic radiation, making it difficult to detect directly.
The term "dark energy" was coined to explain the observed phenomenon that the universe is expanding at an accelerating rate. It is the opposite effect of gravity, which tends to slow down the expansion. Dark energy is believed to be responsible for this accelerated expansion.
Now, to answer your question, the correct definition of dark energy from the given options is: energy that has a small effect on the universe. This definition best captures the nature of dark energy as a force that counteracts gravity and causes the expansion of the universe to accelerate.
To arrive at this answer, you can eliminate the other options:
- Energy that humans cannot observe directly: While it is true that dark energy cannot be observed directly, it is not the defining characteristic. This is because many aspects of the universe, such as black holes or distant galaxies, cannot be observed directly but are not dark energy.
- Energy characterized by black and dark gray colors: Dark energy does not have a color as it does not interact with light.
- Energy that is only emitted by glowing nebulae: Dark energy is not emitted by glowing nebulae or any other astronomical objects. It is a property of space itself.
By process of elimination, we can conclude that dark energy is defined as energy that has a small effect on the universe.