Chapter 29

The ____ of a star determines its temperature, luminosity, and diameter

about half the expected lifetime of our sun has passed

The formation of a star begins with a cloud of interstellar gas and dust called a nebula

Ursa Major, which contains the big dipper is an example of a

Our sun is one of the biggest stars in the universe

lowest layer of the suns surface from which most of the light emitted by the sun comes

protostars come before the nebula

resistance of a stars core to being squeezed halts the collapse of the core & the core becomes

star that is gravitationally bound to another can either be part of a star cluster or a ___star

areas of low density in the gas of the corona from which particles escape

when hydrogen nuclei fuse, they produce helium

The sun is almost entirely composed of hydrogen and helium

red shift is caused by a star moving away from an observer, how do the waves appear

most of the light emitted by the sun comes from the

violent eruptions of particles and radiation from the surface of the sun

Astronomers can identify binary stars by

a parsec is a greater distance than a light year

scientists measure distance to stars and observe how stars interact with one another to

a nebula collapses on itself as a result of its high temperature

arc of gas ejected from the photosphere

brightness of an object if it was placed at a distance of 10pc

Use the table to calculate which of the following units represents the greatest distance

scientists gather evidence about the sun's composition be directly sampling material from it

unit of measurement used to express the energy emitted per second

energy output from the surface of a star per second

visible light arranged according to wavelengths

red shift occurs when a star is

a scientist using the parallex method will notice the greatest shift in a stars appearance when

When the polarity of the sun's magnetic field is taken into account the solar activity cycle

a star that stars with more than about 20 times the Sun's mass will

the line on this graph best describes the relationship between _____?

during a supernova

ancient greek classification system based on how bright a star appears to be

near by stars shift in position when observed from earth this is called

Our sun is an average star

constellations are

cloud of interstellar gas and dust that collapses on itself to from a new star

as nuclear fuel runs out, a star's internal structure and its pressure production change

the state if matter found in the sun's interior is plasma