Classifying stars by the pattern they illustrate is called this.
What is the Hertsprung-Russell (H-R) diagram?
100
These are patterns of stars and the region of space around them.
What is constellations?
100
The study of the origin, structure, and future of the universe is called this.
What is cosmology?
100
The distance is stars and other things in space from Earth is measured in this.
What is light-years?
200
This element is the most abundant in stars.
What is hydrogen?
200
Stars are classified by their temperature and this.
What is luminosity?
200
A large-scale group of stars, gas, and dust bound together by gravity is called this.
What is a galaxy?
200
This scientist discovered that light from a galaxy can be measured in a spectrum and red shifts of galaxies can be studied just like stars.
Who is Edwin Hubble?
200
Stars that are always visible in the night sky, no matter the time of year, seem to circle the North star and are called this.
What is circumpolar stars?
300
Most star temperatures range from these temperatures.
What is 2,800-24,000 degrees Celsius?
300
A star begins as this cloud of gas and dust.
What is a nebula?
300
This type of galaxy is like ours, the Milky Way.
What is a spiral galaxy?
300
This is what the big bang theory states...
What is the universe was once close together and a big bang caused it to expand, which it is still doing today?
300
Most stars are in the ____________ of the H-R diagram.
What is main sequence?
400
This is the apparent shift in a star's position when viewed from different locations.
What is parallax?
400
This process is how stars evolve and this process will stop at the end of a stars life.
What is nuclear fusion?
400
It takes the sun this long to orbit the center of our Milky Way galaxy.
What is 225 million years?
400
These are low levels of energy evenly distributed throughout the universe.
What is cosmic background radiation?
400
This kind of galaxy has a nearly spherical or elongated shape.
What is an elliptical galaxy?
500
If a star is moving toward Earth it will shift this color.
What is blue shift?
500
Depending upon its path, a star will always go through the first two steps in the life cycle of stars which is...
What are nebula to protostar?
500
Astronomers have discovered these in galaxies that are very distant from Earth and have a bright center due to the large amount of energy emitted from them.
What are quasars?
500
These have led scientists to conclude how dark matter and energy compose the universe.
What are ripples?
500
The universe is mostly made of this________by ______%.