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                              1       2                                    
                                  3                 4                      
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  13                                                         14              
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  20   21                                   22                                
                      29                       30                            
31                   32                                                      
                  33                   34                                    
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1 Sudden release of energy from the Sun
4 Large glowing ball of gas in space
6 Distance that light travels in a vacuum in a year, about 9.5 trillion kilometers
7 an explosion so violent that the dying star becomes more brilliant than an entire galaxy
10 A stream of electrically charged particles that flow outward from the Sun
12 Brightness of a star as it appears from Earth
14 A spinning neutron star that appears to give off strong pulses of radio waves
16 the middle layer of Sunís atmosphere
17 dying star surrounded by a cloud of glowing gas
18 Their light is shifted toward the red wavelengths
20 Used to determine how stars or galaxies or approaching or moving away from Earth.
22 Area in the photosphere that are cooler than surrounding gas
23 optical instrument designed to make distant objects appear nearer
24 A set of dark lines that show where light has been absorbed
25 Contracting cloud of gas and dust with enough mass to form a star
26 the universe began in an instant, billions of years ago, when the universe was about two thirds of its present size
27 Person who invented the telescope
28 large bright stars that are smaller and fainter than supergiants
29 Outer layer of Sunís interior
31 Sunís central region where nuclear fusion happens
33 diagonal band on H-R diagram
2 Region of highly compressed gas
3 Matter that doesn't give off radiation
4 very bright stars in the upper right of the H-R diagram
5 white dwarf that has cooled down to the temperature of the cosmic microwave background, and so is invisible
8 innermost layer of Sunís atmosphere - visible surface of Sun
9 an object whose surface gravity is so great that even electromagnetic waves traveling at the speed of light cannot escape from it
11 the dense remnant of a high-mass star that has exploded as a supernova
12 how a bright a star really is
13 Small dense remains of a low or medium mass star
15 the speed at which a galaxy is away is proportional to its distance from us
19 A graph of surface temp or color and absolute brightness of a sample of stars
21 Huge loops of gas that erupt from sunspot regions
30 a large cloud of gas and dust spread out over a large volume of space
32 apparent change in position of an object with respect to a distant background
34 outermost layer of Sunís atmosphere
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