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authority

an accepted source of expert information or advice

intuition

the act or faculty of knowing or sensing without the use of rational processes; it involves immediate cognition

reason

the capacity for logical, rational, and analytic thought- intelligence

sensory data

knowledge obtained through the senses

hypothesis

a tentative explanation for an observation, phenomenon, or scientific problem, that can be tested by further investigation

theory

a set of statements or principles devised to explain a group of facts or phenomena, especially one that has been repeatedly tested or is widely accepted and can be used to make predictions about natural phenomena

law

a well-tested theory, so firm as to be unquestioned by science

model

a schematic description of a system, theory, or phenomenon that accounts for its known or inferred properties and may be used for further study of its characteristics

existence

a fact or state of having actual or real being

causality

cause must always precede the effect

position symmetry

the laws of the universe are not different at different locations

time symmetry

the laws of the universe do not change with time

principle of noncontradition

of two contradictory propositions, both cannot be true

Occam's Razor

simpler explanations are more likely to be true than complex ones

interactions

any of the four fundamental ways in which elementary particles and bodies can influence each other

force

a push or pull on an object

strong nuclear interaction

the interaction between nucleons that gives rise to the strong force

electromagnetic interaction

the interaction between charged objects that gives rise to the electromagnetic force

weak nuclear interaction

the interaction between nucleons that gives rise to the weak force

gravity

the interaction between anything with mass that gives rise to the gravitational force

atomic nuclei

the positively charged central region of an atom composed of protons and neutrons

proton

a composite, strongly interacting particle made up of three quarks; protons carry a positive electrical charge and is a constituent part of the nucleus of atoms

neutron

a composite, strongly-interacting particle made up of three quarks, but which carries no net electrical charge; neutrons area constituent part of the nucleus of the atom

nucleon

a generic name for either a proton or neutron

quark

the elementary particles of which protons and neutrons consist; a proton and neutron each consist of three quarks

radioactive

a term referring to atoms whose nuclei can spontaneously change under the influence of the weak nuclear force

electron

an elementary particle in atoms having a negative charge; electrons are located outside atomic nuclei

element

a substance composed of atoms that have an identical number of protons in each nucleus; elements cannot be reduced to simpler substances by normal chemical means

atom

the fundamental unit of an element

molecule

the microscopic structure usually made up of more than one atom

solar system

the sun and all planets, comets, asteroids, and other bodies that orbit about it under the pull of gravity

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