Science Study Guide: B
|Define the following terms: luminosity, protostar, nebular hypothesis, inertia, gravity, nebula, rotation vs. revolution.||Luminosity = The brightness of a star as compared to other stars. |
Protostar = A stage of a star after the begging of the collapse of the nebula it was created from.
Nebular Hypothesis = The theory that the solar system formed from a mass of nebular matter.
Inertia = The property that states that an object in space will continue along the same track at the same velocity if it is acted upon by no outside force.
Gravity = The force that says that objects will pull other objects of a smaller mass towards them.
Nebula = A cloud of interstellar gas and dust.
Rotation vs. Revolution = Rotation is the movement of a celestial body around its own axis while revolution is the movement of one celestial body around another. One rotation is a day and one revolution is a year.
|What is the relationship between the color of a star and its temperature?||The brighter the star, the hotter it is. For instance a white star is much hotter then a red one.|
|Betelgeuse, a supergiant in the constellation of Orion has about 800 times the radius of the sun. Is it considered cooler or hotter then a blue star? Does it have a higher absolute magnitude then our sun?||It is considered cooler then a blue star. It would have a higher absolute magnitude then our sun.|
|Our sun is classified as what type of star?||A yellow, main sequence star.|
|Is Betelgeuse older or younger then our sun?||It is older.|
|The study of wavelengths of light is called:||Spectroscopy.|
|True or False: Each element gives off its unique spectrum. Why is it true or false?||It is true because when light passes through hot, incandescent gas, the gasses reflect in a certain wavelength of light.|
|How can scientists tell what kind of substances are in far-away stars?||By using a spectroscope the measure spectra of far away stars and then testing those spectra to see what elements are in that star.|
|Explain how we use red shift to explain how the universe is expanding.||Because, according to the Doppler Effect, as light shifts away from us, it moves towards the red end of the spectra. This is known as red shift.|
|Define the Big Bang Theory. Provide evidence for the Big Bang Theory.||The Big Bang Theory is the theory that the universe was once all a single dot and then it suddenly began expanding rapidly and the universe was created. Evidence for this are leftover radiowaves that are still moving throughout the universe.|
|Describe how the solar system formed (nebular hypothesis).||According to nebular hypothesis, the solar system formed from a mass of nebular matter.|
|The electromagnetic spectrum.|
|Discuss the difference between rotation and revolution.||Revolution is the movement of one body around another while rotation is the movement of one object around its axis.|
|Describe how a star is formed according to the nebular theory.||A star begins to form from a nubula. It is considered a star once it has begun to fuse elements together in its core. After that it stays as a star until the point that its core turns to all iron (when it stops fusing) and collapses.|
|Explain how we use red shift (in the spectrum) to determine that the universe is expanding.||The spectra that we would usually see would shift closer the the red end of the spectrum.|
|Describe the Doppler Effect and relate it to red shift.||The Doppler Effect states that light or sound's wavelengths will appear longer.|
|Know the H-R Diagram||Know the H-R Diagram.|
|What is the unit used to measure distance in space?||Light years.|
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