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| 2. |
Star, a star with a substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature. |
| 7. |
Dwarf Star, is the smallest and coolest kind of star in the main sequence. |
| 8. |
Diagram, a graphical tool that astronomers use to classify stars according to their luminosity, spectral type, color, temperature, and evolutionary stage. |
| 9. |
Spectrum, the range of wavelengths or frequencies over which electromagnetic radiation extends. |
| 11. |
a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass. |
| 13. |
Star, begin to fuse helium in the core smoothly and not long after exhausting their hydrogen. |
| 15. |
Sequence Stars, These stars can range from about a tenth of the mass of the sun to up to 200 times as massive. |
| 16. |
Magnitude, The apparent brightness of a star is how bright it actually appears to an observer. |
| 18. |
are cosmic snowballs of frozen gases, rock and dust that orbit the Sun. ... When frozen, they are the size of a small town. |
| 20. |
a solid piece of debris from an object, such as a comet, asteroid, or meteoroid, that originates in outer space and survives its passage through the atmosphere to reach the surface of a planet or moon. |
| 22. |
Shaped Galaxy, gas and dust, and a central concentration of stars known as the bulge |
| 23. |
collectively referred to as spacetime and its contents. |
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| 1. |
Galaxy, they have very little dust and gas left between the stars |
| 3. |
Dwarf Star, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter. |
| 4. |
a fixed luminous point in the night sky |
| 5. |
an apparatus for producing and recording spectra for examination. |
| 6. |
Galaxy, They have no defined shape nor structure and may have formed from collisions, close encounters with other galaxies or violent internal activity. |
| 10. |
Star, the collapsed cores of formerly massive stars that have been crushed to an extreme density by supernova explosions. |
| 12. |
a cloud of gas and dust in outer space, visible in the night sky |
| 13. |
the light or warmth |
| 14. |
made up of minerals rich in silicon and oxygen, "iron", consisting mainly of iron and nickel, or "stony-iron", a combination of the two. |
| 17. |
a relatively small chunk of rocky minerals that orbits the Sun, often described as a minor planet. |
| 19. |
Hole, a region of spacetime where gravity is so strong that nothing no particles or even electromagnetic radiation such as light—can escape from it. |
| 21. |
Way Galaxy, the galaxy of which the sun and the solar system are a part and which contains the myriads of stars that create the light |
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