Chapter 8: Space Physics

Stars

________ 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