Earth and Space Test 1

universe

All of space and everything in it

cosmology

study of the universe

galaxy

A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity

big bang

The initial explosion that resulted in the formation and expansion of the universe

cosmic background radiation

The electromagnetic radiation left over from the big bang

Space-Time

the concepts of time and three-dimensional space regarded as fused in a four-dimensional continuum.

inflation

a hypothetical period of extremely rapid, exponential expansion of the universe in the first fraction of a second after the Big Bang

Dark Matter

matter that does not give off electromagnetic radiation but is quite abundant in the universe

Hydrogen

a colorless, odorless, highly flammable gas, the chemical element of atomic number 1.

Helium

the chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series.

system

a set of things working together as parts of a mechanism or interconnecting network

model

A 3d representation of a person, thing or proposed structure typically on a smaller scale than the original

Energy

Power derived from the utilization of physical or chemical resources especially to provide heat and light or to work machines

Light 

The natural agent that simulates sight and makes things visible

Pressure

Contentious physical force exerted on or against an object

Scientific Law

A statement based on experimental observations that describes what will happen in nature under specific conditions but does not explain why it happens

Scientific Theory

A well-supported, broad explanation for how or why something in the natural world happens, based on a body of evidence, repeated testing, and confirmed through observations and experimentation.

Mass 

the fundamental property of an object that measures the amount of matter it contains and quantifies its resistance to acceleration

Element

A pure substance that can not be broken down into simpler substances by ordinary chemical means