Studied by 8 peopleStars
________ initially form from a cloud of dust and gas called a nebula.
force of gravity
The ________ pulls the dust and gas together to form a protostar.
nuclear fusion
When the temperature gets high enough, hydrogen nuclei undergo ________ to form helium nuclei.
Gravity
________ provides the force that create orbits.
Dark energy
________ is thought to be responsible for the accelerated expansion of the universe.
Artificial satellites
________ are satellites that humans have built.
Heavier elements
________ (up to iron) are created in the core of the star.
solar system
The ________ is all the stuff that orbits our Sun.
dense core
The exploding supernova throws the outer layers of dust and gas into space, leaving a very ________ called a neutron star.
super dense
If the star is massive enough, it will become a black hole- a(n) ________ point on space that not even light can escape from.
circular orbits
The planets move around the Sun in almost ________ (the same goes for the moon orbiting the earth)
Stars
________ and their life cycles produce and distribute all naturally occurring elements.
Prostar
Force of gravity pulls the dust and gas together to form a prostar
Main Sequence Stars
Enters long stable period where the outward pressure and force gravity balance
Supernovas
Big stars glow more brightly as they undergo more fusion and expand and contract several times
Black hole
If star is massive enough, it turns into a black hole
Planets
Mercury, Venus, Saturn, Neptune, Earth, Uranus, Jupiter,
Dwarf planets
like Pluto, dont meet all rules for being a planet
Moons
orbit planets, natural satellites
Artificial satellites
man-made, that generally orbit earth
Nebula
stars initially form from a cloud of dust and gass
Red-shift
Thought that the universe is expanding
Big bang
The universe started with a bang of a tiny space of very dense matter
Note 
Flashcard (34)