Card Set Information
What are recognizable patterns of stars called?
What is a stars actual brightness called?
What are the distances to stars usually measured in?
What are very large stars with masses equal to hundreds or thousands of our sun's mass called?
What two properties of stars does a Hertzsprung-Russell diagram consider?
temperature and luminosity
On what does most stars on the Hertzsprung-Russell diagram fall?
What occurs when a star experiences a huge explosion often destroying it?
What is an unimaginably dense collapsed star from which no light escapes?
What is the apparent change in position of distant object as one's viewing positions changes?
What is a violent nuclear explosion, producing a temporary bright flash?
What is another name for the North Star?
What is a cloud of dust or gas that can be seen against a background of stars?
Who published his first
New General Catalogue (NGC)
, listing 130,000 nebulas and other non-stellar objects?
What are double stars that revolve around each other?
What is a group of stars that are close enough to be held together by gravity and have the same proper motion?
What is a spherical region of space filled with thousands of closely spaced stars?
What are loose mass of many billions of stars, dust, gases,etc.?
What type of galaxy is the Milky War?
Barred spiral galaxy
What are the largest galaxies?
elliptical galaxies .
What type of galaxy doesn't have any regular pattern or shape?
Who first proposed the Big Bang Theory?
What is a hot, dense collection of matter that becomes a star when nuclear fusion begins?
Who proposed the idea of red shift?
What is the study of the universe?
What is the brightest star in the sky?
What are the two kinds of motion that describes stars' real motion?
radial and proper
What are stars that change in brightness because they expand and contract?
How far away is the Earth from the center of the Milky Way?