GLY 1001 Earth Science
Name:________________
Chapter 24 Part K: Key Terms
Fill in
the blanks with the word(s) that best fit the description:
1. _______________ The apparent brightness of a star if it were viewed from a distance of 10 parsecs (32.6 light years). Used to compare the true brightness of stars.
2. _______________
The brightness of a star when viewed from Earth.
3. _______________ A galaxy having straight arms extending from its nucleus.
4. _______________ The theory that proposes that the universe originated as a single mass which subsequently exploded.
5. _______________ a massive star that has collapsed to such a small volume that the gravity prevents the escape of all radiation.
6. _______________ A cloud of glowing gas excited by ultraviolet radiation from hot stars.
7. _______________ A cloud of interstellar dust that obscures the light of more distant stars and appears as an opaque curtain.
Degenerate matter -
9. _______________ A galaxy that is round or elliptical in outline. It contains little gas and dust, no disk, or spiral arms, and few, hot bright stars.
10. _______________ A gaseous nebula that derives its visible light from the fluorescence of ultraviolet light from a star in or near the nebula.
11. _______________ A star that varies in brightness.
12. _______________ A system of galaxies containing from several to thousands of member galaxies.
13. _________________________ A plot of stars according to their absolute magnitudes and spectral types.
14. _______________ Relates the distance to a galaxy and its velocity.
15. _______________ The conversion of hydrogen through fusion to form helium.
16. _______________ Dust and gases found between stars.
17. _______________ A galaxy that lacks symmetry
18. _______________Light-year The distance light travels in a year, about six trillion miles.
19. _______________Local Group The cluster of 20 or so galaxies to which our galaxy belongs.
20. _______________Magnitude A number given to a celestial object to express its relative brightness.
22. _______________ A sequence of stars on the Hertzsprung-Russell Diagram, containing the majority of stars, that runs diagonally from upper left to lower right.
23. _______________ A cloud or stellar gas and/or dust.
24. _______________ A star of extremely high density composed entirely of neutrons.
25. _______________ - A star that explosively increases in brightness.
26. _______________ A shell of incandescent gas expanding from a star.
27. _______________ A collapsing cloud of gas and dust destined to becomes a star.
28. _______________ A variable radio source of small size that emits radio pulses in very regular periods.
29. _______________- A variable star that pulsates in size and luminosity.
30. _______________ A large, cool
star of high luminosity, a star occupying the upper-right portion of the Hertzsprung-Russell
Diagram.
31. _______________ A relatively dense dust cloud in interstellar space that is illuminated by starlight.
32. _______________ A flattened, rotating galaxy with pinwheel-like arms of interstellar material and young stars winding out from its nucleus.
33. _______________ A measure of stellar distance.
34. _______________ A very large star of high luminosity.
35. _______________ An exploding star that increases in brightness many thousands of times.
36. _______________ A star that has exhausted most or all of its nuclear fuel and has collapsed to a very small size; believed to be near its final stage of evolution.
Chapter 24 Word
List
|
Absolute magnitude Apparent magnitude Barrel spiral galaxy Big bang Black hole Bright nebula Dark nebula Degenerate matter Elliptical galaxy Emission nebula Eruptive variables Galactic cluster |
Hertzsprung-Russell (H-R) diagram Hubbles law Hydrogen burning Interstellar dust Irregular galaxy Light-year Local Group Magnitude Main-sequence stars Nebula Neutron star |
Nova Planetary nebula Protostar Pulsar Pulsating variables Red giant Reflection nebula Spiral galaxy Stellar parallax Supergiant Supernova White dwarf |