SPACE 1

VOCABULARY

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Hypothesis

-Is a tentative explanation that is tested to determine if it is valid.

-This is a statement that is tested.

-Is tested more than once.

-Can be proven or disprove.

-Usually has If, then, because, in the statement.

Nebula

-Is a cloud of gas and/or dust in space.

-Also made up of gas.

-Part of the nebular hypothesis.

Nebular Hypothesis

-Is the theory that the solar and stellar systems were developed from a primeval nebula.

-Is a hypothesis.

-Beveled that our universe was created by a nebular.

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Solar System

-the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.

Hydrogen

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

-Symbol is H

-Atomic number is 1

Helium

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

-Symbol is He

-Atomic number is 2

Planetesimals

-Is a body that could or did come together with many others under gravitation to form a planet.

-Also called a minute planet.

-Forms a planet.

-Similar to the Nebular Hypothese

Density

-Is the mass per unit volume of a substance, usually expressed as grams per cubic centimeter.

-Tells you Which floats more.