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ASTRONOMY
TRY THESE ACTIVITIES
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| A | B |
| CONSTELLATION | GROUP OF STARS |
| GALAXY | SYSTEMS OF PLANETS |
| NEBULA | CLOUD OF GAS AND DUST IN SPACE |
| SUNSPOTS | COOLER AREAS OF THE SUN |
| CORONA | OUTER LAYER OF THE SUN |
| HUBBLE | LARGE REFLECTING TELESCOPE |
| GEOCENTRIC | THEORY THAT SAYS EARTH IS CENTER OF UNIVERSE |
| HELIOCENTRIC | THEORY THAT SAYS THE SUN IS CENTER OF THE SOLAR SYSTEM |
| RETROGRADE | BACKWARDS MOTION OF STARS AND PLANETS |
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