Across
- 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.
Down
- 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