He believed matter was made up of tiny individual particles called atomos, from which the English word atom is derived. 他认为物质由微小的不可分割的粒子组成,将之称为atomos,英语单词原子atom由此衍化而来。 Democritus believed that atoms could not be created, destroyed, or further divided. 德谟克...
The growth of structure is hierarchical with more massive structures forming, over time, from the merging of less massive precursors. The mass function of dark-matter halos can be calculated by simply evolving the tiny fluctuations in the density field at recombination, as measured by CMB ...
10, based on the assumption that dark matter is composed of a single type of weakly-interacting massive particles. Beside uncertainties related to nucleon models such analyses are still limited by our poor knowledge of the local dark matter density and velocity, as can be seen in Fig. 11, ...
Tiny doubles: new states of matter, formed from particles more alike than any cloneAtomic particles can be indistinguishable in form and behavior, unlike larger entities, such as human beings, as seen in the Bose-Einstein condensation (BEC) phenomenon. Randall ...
it was widely believed that dark matter was composed of heavy elementary particles. These were not discovered despite a multitude of efforts, and scientists are now turning to alternative theories to explain dark matter. A recent theory says that dark matter is actually something...
Although ancient Greeks came up with their own atomic theory of matter, the modern atomic theory began in the early 19th century when English chemist John Dalton (1766-1844) proposed that homogenous substances are made up of tiny identical particles called atoms. These are essentially indivisible ...
Some theories suggestdarkmatteris actually composed of tiny particles that don't interact withlight or regular matter, except through gravity. One candidate for what darkmatter might be made of is a never-before-seen particle called the axion that hasa small mass and no charge. ...
Baryonic matter, which makes up all matter you've ever seen, is affected by both gravity and pressure.重子物质,构成着你所见过的一切物质,同时受到重力和压力的影响。 And radiation composed of innumerable particles of light, also known as photons.以及由无数光的粒子形成的辐射,也被称为光子。 In ...
it is composed of many small grains of solid sand. Matter can also have properties of more than one state when it is a mixture, such as with clouds. Clouds appear to behave somewhat like gases, but they are actually mixtures of air (gas) and tiny particles of water (liquid or solid)...
Gases consist of tiny particles. 2. The distance between particles is large compared with the size of the particles them- selves. The volume occupied by a gas consists mostly of empty space. 3. Gas particles have no attraction for one another. 4. Gas particles move in straight lines in ...