1)Most stars on an H-R diagram are found in one part of the diagram. It is an ar
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Question
1)Most stars on an H-R diagram are found in one part of the diagram. It is an area on the diagram where all stars are plotted for 90% of their lifespans. What part of the diagram is that? A) Top B)Left C) Subgiant Branch D)Red Giant Branch E)Main Sequence
2)What is a category of star systems where you can figure out how heavy the stars are (their masses)?A) Binary Stars B) Center of mass C) older starts D)Younger stars E)Hotter Starts F) coller stars
3)If two stars are orbiting each other, what is the name for the point in space that they both go around? A)Center of mass B)middle point C)Balance point D) semi-major axis E) Ellipse
4)What two measurements are plotted on a “light curve”? (these go on the vertical and horizontal axes)? A)Velocity and temp B) Brightness and time C)distance and temp D) velocity and time E) brightness and temp F) brightness and volocity G) brightness and distance H)velocity and distance
5)Sometimes astronomers see something on the sky that looks like one star. They spread the light of the star out into a spectrum. Then they see there is evidence in spectral lines that there are actually two stars present. This kind of binary star is called what? A)Spectroscopic binary B) Astrometric binary C) Close binary D) Visial binary
Explanation / Answer
1- In a Hertzsprung Russell(H-R) diagram the area of star with 90% of their lifespan is from definition known to be "Main Sequence"
2- The clue for the heavy stars come from the fact that Hotter stars are more massive and are more luminous, so the answer for this would be "Hotter Stars".
3-When two bodies are orbiting each other they are actually orbiting their center of mass, they are stretched by centrifugal force. So the answer would be "Center of mass".
4- This is totally a theoretical and graphical representation, where brightness is plotted on vertical axes whereas time in days is plotted on horizontal axes, thus the answer is "Brightness and time".
5- No explanation needed indeed.It is simply the definition of Spectroscopic binary stars.Thus answer is "Spectroscopic binary".
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