What Does Dark Matter Mean In Science

Dark matter definition a hypothetical form of matter invisible to electromagnetic radiation postulated to account for gravitational forces observed in the universe.

What does dark matter mean in science.

What is dark energy. Dark matter is stuff in space that has gravity but it is unlike anything scientists have ever seen before. Roughly 70 of the universe is made of dark energy. The first variety is about 4 5 percent of the universe and is made of the familiar baryons i e protons neutrons and atomic nuclei which also make up the luminous stars and galaxies.

That only leaves a small 5 for all the matter and energy we know and understand. Most of this baryonic dark matter is expected to exist in the form of gas in. The rest everything on earth everything ever observed with all of our instruments all normal matter adds up to less than 5. The matter of which the earth is made.

Roughly 80 of the mass of the universe is made up of material that scientists cannot directly observe. Dark matter makes up about 25. More is unknown than is known we know how much there is and we know some of its properties. Two varieties of dark matter have been found to exist.

Other than that dark energy is a mystery but an important one. Matter definition the substance or substances of which any physical object consists or is composed. Matter is a general term describing any physical substance by contrast mass is not a substance but rather a quantitative property of matter and other substances or systems. According to one idea dark energy is a fifth and previously unknown type of fundamental force called quintessence.

Matter should not be confused with mass as the two are not the same in modern physics. Unlike for dark matter scientists have no plausible explanation for dark energy. Together dark matter and dark energy make up 95 of the universe. Various types of mass are defined within physics including but not limited to rest mass inertial mass.

Dark matter is a form of matter thought to account for approximately 85 of the matter in the universe and about a quarter of its total mass energy density or about 2 241 10 27 kg m 3 its presence is implied in a variety of astrophysical observations including gravitational effects that cannot be explained by accepted theories of gravity unless more matter is present than can be seen.