Chapter 13 Level Blue – Flashcards
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The positions of the constellations appear to change throughout the year because ____.
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Earth revolves around the Sun
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Its ____ makes Sirius the brightest star in the night sky.
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apparent magnitude
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The distances to nearby stars can be measured by using ____.
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parallax
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About 90 percent of the stars in space are ____ stars.
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main sequence
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The hottest stars in space are ____ in color.
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blue
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A main sequence star becomes a ____ after it uses up the hydrogen in its core.
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giant
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The Sun produces energy by fusing hydrogen atoms into ____ atoms in its core.
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helium
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The intense magnetic fields of sunspots cause archlike eruptions called ____.
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prominences
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Our Sun is NOT ____.
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a part of a binary system
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A galaxy that has a shape similar to a football is a(n) ____ galaxy.
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elliptical
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All of the following are true of the Milky Way EXCEPT that it ____.
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has more than 800 billion stars
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The Big Bang theory of the formation and expansion of the universe is supported by the observed ____.
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red shift
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Although it has a greater ____ than Sirius, Rigel does NOT look as bright in the night sky.
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absolute magnitude
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A ____ is a region so dense that nothing, including light, can escape its gravity field.
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black hole
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Dark, cooler areas on the Sun's surface are called ____.
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sunspots
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The Clouds of Magellan are two ____ galaxies orbiting the Milky Way.
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irregular
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The coolest stars in the sky are ____ in color.
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red
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A group of stars, gas, and dust held together by gravity is a ____.
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galaxy
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A sequence of star colors from hottest to coolest is ____.
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blue, yellow, orange, red
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____ are patterns of stars in the sky.
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Constellations
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As Earth travels in its ____, different constellations are visible at different times of the year.
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orbit
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A measure of the amount of the light given off by a star is its ____.
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absolute magnitude
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A measure of the amount of light received on Earth is a star's ____.
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apparent magnitude
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____ is the apparent shift in the position of an object when viewed from two locations
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Parallax
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A star begins as a ____, a large cloud of gas and dust.
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nebula
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The Sun produces energy by forming ____ in its core.
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helium
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Prominences and flares on the Sun are related to sunspots because they are all caused by ____.
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intense magnetic fields
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The number of observed sunspots, prominences, and flares increases in a cycle that occurs every ____ years
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20
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Our Sun is considered average because its temperature and absolute magnitude place it in the ____ range of the H-R diagram.
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main sequence
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Our Sun is unusual because it does not belong to a(n) ____.
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...binary star system
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Two stars orbit each other in a(n) ____ star system.
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...binary
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The spiral shape of the Milky Way Galaxy CANNOT be seen from Earth because ____.
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...we are located within one of its spiral arms
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The ____ states that between 15 and 20 billion years ago, the universe began expanding out of an enormous explosion.
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...Big Bang theory
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A red shift in the spectrum of the light from an object indicates the object is moving ____ you.
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away from
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classification of most stars on the H-R diagram
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main sequence
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largest known galaxy is this type
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...elliptical galaxy
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process that produces energy in the Sun
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...fusion
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galaxy type without a definite shape
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...irregular galaxy
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apparent movement of a star used to measure its distance from Earth
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......parallax
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recent evidence suggests the Milky Way Galaxy may be this type
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barred spiral galaxy
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distance measurements based on the speed of light; used for objects in space
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...light-year
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graph that shows the relationship of a star's temperature to its absolute magnitude
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H-R diagram
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about 100,000 light-years across
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Milky Way Galaxy
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stage in a star's evolution formed as the core of a main sequence star uses up its helium and the outer layers escape into space
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white dwarf
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Match the stages of a star's life cycle below with the corresponding letters in Figure 13-1 ____ main sequence star ____ neutron star ____ nebula ____ supernova ____ white dwarf ____ red giant
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b.....Main Sequence star e......neutron star a........nebula c............supernova f............white dwarf d..........red giant
