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DSST Astronomy
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DSST Astronomy
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25 Questions

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

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

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

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

5. An immense cloud of gas (mainly hydrogen) and dust in interstellar space.

6. Polish astronomer who produced a workable heliocentric model of the solar system.

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

8. Energy that is radiated or transmitted in the form of rays or waves or particles.

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

10. 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.

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

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

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

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

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

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

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

18. A star that expands and cools once it runs out of hydrogen fuel.

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

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

21. 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.

22. The small - dense remains of a high-mass star after a supernova.

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

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

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

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