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DSST Astronomy
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DSST Astronomy
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25 Questions

1. Either of the two times of the year when the Sun is at its greatest distance from the celestial equator.

2. Either of the two celestial points at which the celestial equator intersects the ecliptic plane.

3. Depressions that form when a volcano collapses - as opposed to craters formed by meteoroid impact.

4. An orbit that is backward or contrary to the orbital direction of the other planets.

5. Also called nuclear bulge - this is a swelling at the center of spiral galaxies. Bulges consist of old stars and extend out a few thousand light-years from the galactic centers.

6. A rapidly rotating neutron star which emits radiation in magnetic pulses.

7. The portion of the Milky Way in which our solar system resides.

8. The large - outer planets made of gas - Jupiter - Saturn - Uranus - & Neptune. These all have large moons and rings.

9. Type of active galaxy whose emissions come from a very small region within the nucleus of an otherwise normal-looking spiral system.

10. Large - dense groupings of older stars held together by mutual gravitational attraction - which is what keeps them together longer than open clusters.

11. A relatively small extraterrestrial body consisting of a frozen mass that travels around the Sun in a highly elliptical orbit.

12. Stage in which a star has used up its helium and its outer layers escape into space - leaving behind a hot - dense core that contracts.

13. Italian astronomer and mathematician who was the first to use a telescope to study the stars.

14. The name given to the four inner planets: Mercury - Venus - Earth - and Mars. Mercury and Venus lack moons.

15. The dark lines in a spectrum where light of particular wavelengths has been absorbed.

16. The period between successive new moons (29.531 days).

17. Arrangement of electromagnetic radiation--including radio waves - visible light - gamma rays - X-rays - ultraviolet waves - infrared waves - and microwaves--according to their wavelengths.

18. A change in the apparent frequency of a wave - as observer and source move toward or away from each other.

19. The apparent displacement of an object as seen from two different points that are not on a line with the object.

20. Very bright - often giant - elliptical galaxy type that emits as much or more energy in the form of radio wavelengths as it does wavelengths of visible light.

21. A narrow - bright region of the spectrum - produced when electrons in atoms jump from one energy level to a lower energy level.

22. A cluster of stars (or a small constellation).

23. A pair of stars held together by their mutual gravity and in orbit about each other which can be seen with a telescope as separate objects.

24. The distance that light travels in one year; about 9.46 trillion kilometers.

25. The speed of light in meters per second. It is also 300 -000 kilometers per second and 186 -000 miles per second.

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