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Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.

# data[].attributes.attachment_link.description
Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.

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We can calculate a star's or supernova's distance from Earth by it's brightness. Basically, the brighter it is, the closer it is to us. Like the sun, if it were closer, we would be blinded by its light. It's as simple as that. But why does the distance matter other than to calculate the red shifting? Light takes time to reach us, so by calculating the distance of the star/supernova/galaxy, we can tell how far in the past we're seeing. The dimmer it is, the further the distance, and the further in the past we're seeing.

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We can calculate the speed of a star or supernova moving away from us by its color. If the star is x% redder than it normally would be at its distance from Earth, it's moving away from us at x% the speed of light. The redder the star/supernova, the faster its moving away from us.

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We can tell that the expansion of the Universe has sped up over time by observing supernovas different distances away and plotting its speed over time...By examining something as big and bright as a supernova, we can look really far into the past. So if we were to look at a supernova further away from us and compare it to supernovas significantly closer, we can plot to find out if its speed (calculated by red shift) has increased or not over time (calculated by the brightness of it, brighter meaning closer, dimmer meaning further.) Scientists that have plotted this have found that the Universe is expanding faster today than long ago. This proves that the expansion of the Universe is accelerating.

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Albert Einstein first came up with the idea that outer "space" had a special energy which caused the "space" to multiply.  And he theorized that this energy was a natural property of space, so it would continue to spread. It was later presented as "dark energy" in 1998, as a force that repels gravity. Dark energy currently takes up about 69% of the universe, continuing to multiply, and accelerate the expansion of the universe.

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Yes, the Universe's Expansion is accelerating

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Yes, the Universe's Expansion is accelerating

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The acceleration of the expansion of the Universe can be explained by a mysterious force dubbed dark energy. Dark energy is a repulsive force that works against gravity, preventing the it from slowing down or even reversing the Universe's expansion