Telescopes
Stars 1
Stars 2
The Sun
Potpourri
100
Refracting telescopes create images using what?
An objective lens
100
What information does a star's spectrum offer about the star?
It reveals informations about the star's chemical composition.
100
After a main-sequence star has exhausted the hydrogen in is core it becomes a what?
It swells up into a bloated Red Giant.
100
Our sun is what kind of star?
A main sequence star.
100
Stellar distances are usually measured in what units?
Light years.
200
Reflecting telescopes use what to create a clear image?
A large mirror
200
What is the name of the effect that makes stars and galaxies appear red or blue depending on how they are moving in relation to us?
The Doppler Effect
200
About 90% of stars on the H-R Diagram are what kind of stars?
Main Sequence Stars
200
Where is our sun located in the Milky Way?
Within one of the spiral arms.
200
Based on evidence from cosmic background radiation, what can we conclude about the nature of our universe?
It is expanding
300
The Hubble Telescope is an example of what?
A reflecting telescope (based in space)
300
What is the product of the nuclear fusion of hydrogen?
Helium (and a ton of energy!)
300
What is another name for the cloud of gas and dust that may eventually form a star?
A nebula
300
Our sun can continue to exist in its present state for about another...
There are various answers for this but for the purposes of this test, 5 Billion Years.
300
Light cannot escape the intense gravitational pull of a ______?
Black Hole
400
What form of energy do telescopes use to make observations?
Electromagnetic Energy
400
An H-R Diagram shows the relationship between what two things?
Temperature and (brightness/luminosity/absolute magnitude).
400
What must take place before a star can be "born"
It must reach a high enough temperature for nuclear fusion of hydrogen to occur.
400
What is the outermost layer of the sun?
The Corona
400
The force that gravity exerts on an object is called ________.
Weight. Mass is a property of matter. Weight is the effect gravity has on mass.
500
Name 4 of the forms of electromagnetic energy.
Radio waves, microwaves, infrared, visible light, ultraviolet light, x-rays, gamma rays
500
All stars, regardless of their size eventually do what?
Run out of fuel and collapse.
500
What force is most responsible for the formation of a star?
Gravity
500
What are the most explosive events on our sun called?
Solar flares
500
Describe the geocentric model of the universe.
It is a model of the universe that has the Earth at the center with everything else orbiting a stationary earth.
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