Science Chapter 20

Question Answer
The Sun occupies ______ of our solar system. 99.9%
The energy of the sun is due to the fusion process
The fusion process gives off light and heat
The sun's core is very dense gas at _____ degrees. 15,000,000
Energy of the sun travels through radiative zone, convection zone, photosphere, chromosphere and finally the corona.
Which layer of the sun do we see from earth? photosphere
It takes the _____minutes for light to travel from the Sun to the Earth. 8
What is the outermost layer of the Sun? Corona
What is Auroras? Glowing lights produced by electrically charged solar winds.
Fusion produces _______ in the sun. energy
Fusion may vary in size, brightness and temperature
Light Year The distance light travels in one year
Amount of light(temperature) and distance from earth determines brightness
Parallax is the apparent shift in position of an object
The size of the sun is ______ times bigger than earth. 100
You need a telescope to see white dwarfs (star)
What determines the white, blue or red colors of stars? Temperature
Higher mass stars develop more _________ than lower mass stars. quickly
The main sequence stage of a lower mass star produces energy through fusion of hydrogen into helium
Lower mass stars will last billions of years
Our sun has been a main sequence star for 4.6 billion years and will be one for another _______years 5 billion
Pulsars strong emissions of xrays occur and sometimes radio waves
Supernovas collapse into a ______. black hole
The Milky way galaxy measures more than 100,000 years from the sun
What makes up our galaxy space, stars and planets
Milky Way galaxy is a ___________ galaxy spiral
The center bulge of a spral galaxy is a _______________. black hole
Spiral galaxies also have sprial arms
Elliptical galaxies are shaped like eggs
Irregular shape galaxies are w/o a definite shape
Our galaxy has a black hole with a mass 3 million times that of the sun.
black holes are invisible as gases are pulled toward the center
The universe consists of space, energy and matter
The doppler effect is a change in the observed wavelength
The universe began during THE BIG BANG THEORY

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