Life Cycle 1
All stars form in a ___________.
Stellar nebula
What color are cooler stars?
Red
What type of galaxy are we in?
Spiral Galaxy
Star systems that have two stars are called ________.
Double stars or Binary stars
The movement of one object around another.
Revolution
After a stellar nebula, a star turns into a __________ when it begins nuclear fusion.
protostar
In the main sequence phase, the largest stars are typically what color?
Blue
Why type of galaxies have a black hole in their centers?
Quasars
A system in which one star periodically blocks the light from another is called _______________.
an eclipsing binary.
What causes the seasons?
Tiled Earth's axis
After a white dwarf runs out of all its energy, it will become a _____________.
Brown or Black dwarf
What happens at the end of the life of a massive star?
Supernova
What are galaxies bound together by?
Gravity
Round star clusters that are packed with millions of stars are called ____________.
Globular Clusters
When the Northern hemisphere is tilted away from the sun, it is __________ in the Southern Hemisphere.
Summer
The point at which no light can escape around a black hole is called the _______________.
Event Horizon
As a star in the main sequence phase begins to lose energy, it _______________.
Expands/grows
Cools down
Becomes red/orange
What type of galaxy only contains old stars?
Elliptical galaxy
How do scientists know that some stars have another star or planet revolving around it if they can't see the other one?
They study the movement of the main star.
What are the two things gravity is affected by?
Mass and Distance
An average star will turn into a _______________ right before it turns into a white dwarf.
Planetary Nebula
What factor determines what a massive star will become at the end of its life?
Mass
In a spiral galaxy, where do new stars usually form?
In the arms
What do all of the stars in a star cluster have in common?
Formed from the same nebula, at the same time, same distance from Earth.
What is Newton's first law of motion?
An object at rest will stay at rest and an object in motion will remain in motion unless acted upon by another force.