define-
i) normal matter
ii) dark matter
iii) dark energy
class 9
Answers
Answer:
short, dark matter slows down the expansion of the universe, while dark energy speeds it up. ... This is because dark matter does interact with gravity, but it doesn't reflect, absorb, or emit light.
Explanation:
the scale of elementary particles, a definition that follows this tradition can be stated as: "ordinary matter is everything that is composed of quarks and leptons", or "ordinary matter is everything that is composed of any elementary fermions except antiquarks and antileptons".
Answer:
In classical physics and general chemistry, matter is any substance that has mass and takes up space by having volum
(in some cosmological theories) non-luminous material that is postulated to exist in space and that could take any of several forms including weakly interacting particles ( cold dark matter ) or high-energy randomly moving particles created soon after the Big Bang ( hot dark matter ).
a theoretical form of energy postulated to act in opposition to gravity and to occupy the entire universe, accounting for most of the energy in it and causing its expansion to accelerate.
"Einstein's theories allow for the possible existence of dark energy"