Science Puzzle

3. Is a young blue white star and one of the most luminous of all stars, about 36,000 times that of the sun.
5. The difference in the two solar calendars is caused by an astronomical phenomenon called?
7. Is the measurement of the shift of a nearby object compared to distant objects when observed from two different positions.
9. Also describe the actual brightness of a star using the term absolute magnitude.
12. It is also known as the "Big Bear" and is one of the most famous constellations.
14. Means "circle of animals" in Greek.
16. They are seen by the observer at northern mid-latitudes.
18. One myth claims that _____ is always visible in the Northern Hemisphere but not in the Southern Hemisphere.
19. Depends on it its size and temperature.
21. They lie on either side of the celestial equator which is the projection of the earth's equator to the sky.
23. Are constellations that move in a counterclockwise direction.
24. Of the earth's revolution around the sun, near stars seem to shift their positions against the farther stars and this is called.
25. They are seen by the observer at the southern mid-latitudes.

1. It is one of the most prominent star patterns in the sky.
2. Is the imaginary line traced by the sun in the sky.
4. It is a constellation named after the Greek hero?
6. 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.
8. Are groups of bright stars which appear close to each other on the sky but are actually light years apart in space.
10. Astronomers defined the _____ as the standard unit of distance.
11. Refers to an opaque object that emits thermal radiation.
13. The star patterns that have been discovered but have not been officially identified as constellation are called?
15. According to Ian Ridpath's star tales _______ was a vain and boastful wife of King Cepheus of Ethiopia who lives next to her in the sky.
17. Are formed when a gas of cloud out in the nebula or other region of interstellar space collapses under the influence of gravity.
20. Of a star is described in terms of magnitude and luminosity. and luminosity.
22. Is a red star.