Why is the universe expanding so fast?
Dark energy is forcing it.
In any case, that is the theory. For the past 20 years or so, scientists have been aware that only approximately 5% of matter in the universe is visible. The remaining 95% is invisible and is therefore referred to as dark matter or energy. Based on this, scientists have theorized that dark energy is what powers our universe's expansion.
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Dark energy is an enigmatic force that accelerates the expansion of the universe by opposing the gravitational attraction of matter to itself.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
- Why does light refract when it goes through a prism? How does the glass bend the light rays?
- Can you change the wavelength of light by putting a filter on it?
- Why does intergalactic space expand, but not not galaxies and solar systems themselves?
- What are divergent and convergent beams of light?
- Why is it difficult to detect planets orbiting other stars?
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