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Test 4 Discussion Questions
Terms in this set (12)
What are the 2 types of motions for stars?
Diurnal (Daily) motion and Actual Motion
What causes the motion of stars?
They move because of the rotation of the earth
what is Diurnal motion?
stars rotate in circles around polaris
what is actual motion?
stars actually move but we don't notice it easily because they are far away
How do we know what stars are made of?
Dark lines in the spectrum show the elements in stars
What happens within a star that causes it to become a red giant?
stars begin to die and grow in mass and become cooler
How is a planetary nebula different from a supernova?
it is much bigger and faster
Which type of star (stars with average masses or very massive
stars) eventually becomes a white dwarf?
Describe the size and density of a white dwarf.
small and very dense
How does a black hole form?
forms when a massive star dies
What is the event horizon of a black hole?
is the region around the black hole that determines whether an object can escape
The most important evidence that suggests black holes exist
involves the interaction of a black hole and a companion star. Describe this evidence.
gas falls into a black hole forming a companion star
as the gas accelerates toward the even horizon it gives off jets beams or high energy x rays that are detected on earth
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