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Dark matter, thought to comprise about 27% of the universe, is a hypothesized form of matter that is invisible but is inferred to exist based on its gravitational effects on ordinary matter ...
Gravity is one of the universe's fundamental forces. Einstein's theory linked space, time and gravity. ... The universe's contents include ordinary matter - stars, planets, gas, dust and all the ...
While dark matter has never been detected, it is believed to make up 85% of the total matter in the universe. Meanwhile, dark energy is a mysterious force thought to play a role in the ...
In the case of accelerated expansion, ¨ is positive; therefore, ˙ was smaller in the past than today. Thus, an accelerating universe took a longer time to expand from 2/3 to 1 times its present size, compared to a non-accelerating universe with constant ˙ and the same present-day value of the Hubble constant. This results in a larger light ...
Giant clouds of hydrogen and helium were gradually drawn to the places where matter was most dense, forming the first galaxies, stars, and everything else seen today. From studying the effects of gravity on both matter and light, it has been discovered that the universe contains much more matter than is accounted for by visible objects; stars ...
Collisionless: Dark matter particles interact with each other and other particles only through gravity and possibly the weak force; Dark matter constitutes about 26.5 % [12] of the mass–energy density of the universe.
The research suggests matter is not as “clumpy” as would be expected based on the current best model. Scientists release newly accurate map of all the matter in the universe Skip to main content
The matter must, of course, also satisfy whatever additional equations were imposed on its properties. In short, such a solution is a model universe that satisfies the laws of general relativity, and possibly additional laws governing whatever matter might be present. [53]