Science 9 Crossword Puzzle

1. a massive ball of plasma that emits light throughout the universe.
2. is described in terms of magnitude and luminosity.
5. the next closest star to Earth.
6. a constellation named after the Greek hero Herakles.
8. one of the most popular asterisms known to mankind.
9. the difference in the two solar calendars is caused by this astronomical phenomenon.
10. stars that are the coolest stars in the universe.
11. group of stars in the sky that form a pattern.
13. is also known as the Big Bear.
16. standard unit of distance.
18. one of the most prominent star patterns in the sky.
20. is always visible in the Northern Hemisphere but not in the Southern Hemisphere.
21. the power of a star.
22. an imaginary line that passes through the Earth from its North Pole to its South Pole.

1. stars are those with a mass of more than 10 times higher than that of our sun and a luminosity nearly 1,000,000 times as great.
3. stars with a mass of about 0.8 to 10 times the solar mass of our sun.
4. constellations that move in a counterclockwise direction.
7. means circle of animals.
8. refers to an opaque object that emits thermal radiation.
11. the only husband-and-wife couple among the constellations.
12. magnitude that is viewed from the Earth.
14. the star patterns that have been discovered but have not been officially identified as constellation.
15. is recognized in astronomy but is not an astrological sign.
17. is the measurement of the shift of a nearby object compared to distant objects when observed from two different positions.
19. a star that displays very little movement in the sky.