According to the big bang theory, the universe began about ___________
13.7 billion years ago
Based on the observed red shifts in the spectral lines of distant galaxies, astronomers conclude that ______________
The universe is expanding
Where is the sun located in the Milky Way?
Within one of the spiral arms
The next stage in the sun's life cycle
Is the sun
Matter should admit this and be very hot before being engulfed into a black hole
This star is composed of matter in which electrons have combined with protons
Is most responsible for the formation of a star
Another name for the interstellar matter that will eventually form a star
A diagram that shows the relationship between temperature and absolute magnitude
Is not a type of nebula
This magnitude is associated with the brightest star
If star A is farther from Earth than star B, but both stars have the same absolute magnitude, what is true about their apparent magnitude?
Star B has the greater apparent magnitude
The measure of a star's brightness
Are the units used to express stellar distances
The mass of a star can be determined by studying ________
Binary star systems
The color of a star with the highest surface temperature
The source of the sun's energy
The sun's surface has a grainy texture produced by numerous bright markings called __________
The part of the sun which lies directly above the visible "surface" of the sun
What advantage do space telescopes have over telescopes used on Earth
They are not affected by Earth's atmosphere
The first space telescope built by NASA
Hubble Space Telescope
Weaken the images of stars
Which property of an optical telescope is associated with sharper images?
Is used in a refracting telescope to produce an image
Large doppler shifts indicate __________
A typical incandescent light bulb produces a _________
Has the longest wavelength
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