Atoms
The smallest unit of matter.
What is an atom?
Process that combines smaller atoms into larger ones.
What is nuclear fusion?
Gravity is a _______ force.
What is noncontact?
Elements that make up (majority) of stars.
What are hydrogen and helium?
Theory that the universe began in a hot, dense state and has been expanding ever sense.
What is the Big Bang?
does not try to explain what came before or where the matter and energy came from!
What are protons, neutrons, and electrons?
Force responsible for fusion.
What is gravity?
2 factors that affect gravity.
What is mass and distance.
Organization of the scale of the universe (from biggest to smallest).
What is universe>galaxies>solar systems>stars>planets>moons?
What is matter and energy?
Subatomic particle that determines the identity of an element.
What is a proton?
Additional product on nuclear fusion (besides atoms).
What is energy (light and heat)?
Change in the gravitation force on between 2 objects when the distance decreases.
What is increase?
Determines classification of stars.
What is temperature and brightness(luminosity)?
(axes of HR diagram)
The first elements fused together after the cooling period after the big bang.
What are hydrogen and helium?
Location of most of the mass of an atom.
What is the nucleus?
Reason stars can undergo nuclear fusion but gas giants cannot.
What is increased gravitational force and pressure?
_____ is a measure of the amount of matter in an object, while _____ is a measure of the force of gravity acting on an object.
What is mass and weight?
Classification of our star (the sun).
What is main sequence?
Change to absorption spectra of distant galaxies, indication that they are moving away from us.
What is red shift?
Difference in number of protons and electrons in an atom with a neutral charge.
What is 0?
Largest elements stars can form before running out of energy.
What is Iron?
Matter pulled together by gravity of the stars to form the solar system.
What is dust and gas?
Method used to determine the composition of the stars.
What is an absorption spectra?
Energy that is left over from the big bang that has cooled/ gotten weaker (stretching out the wavelength).