Across
- 3. A type of galaxy characterized by its elliptical shape and lack of spiral arms.
- 6. The total amount of energy emitted by a celestial object per unit time.
- 7. Electromagnetic radiation with wavelengths longer than those of infrared light but shorter than those of radio waves.
- 8. The number of cycles of a periodic wave that occur in a unit of time.
- 10. A small, dense star that has exhausted its nuclear fuel and is in the final stage of stellar evolution.
- 12. The prevailing cosmological model for the observable universe's earliest known periods, stating that the universe expanded from a very high-density and high-temperature state.
- 14. A well-substantiated explanation of some aspect of the natural world that is based on a body of evidence and has stood up to repeated testing and scrutiny.
- 19. The measure of a celestial object's intrinsic brightness, typically measured at a standard distance from Earth.
- 24. The brightness of a celestial object as observed from Earth.
- 25. A star that has evolved off the main sequence and has expanded and increased in luminosity.
- 26. Spectrum The range of all possible frequencies of electromagnetic radiation.
- 30. Electromagnetic radiation with the longest wavelengths and lowest frequencies in the electromagnetic spectrum.
- 31. Way Galaxy The spiral galaxy containing our Solar System.
Down
- 1. The temperature of the outer layer of a celestial object, such as a star.
- 2. Star A star, like the Sun, that is in the stable stage of hydrogen fusion in its core.
- 4. A graph that plots the luminosity of stars against their surface temperature, providing insights into stellar evolution.
- 5. A massive and highly luminous star in late stages of its evolution.
- 9. The entirety of space, time, matter, and energy, including galaxies, stars, planets, and all other forms of existence.
- 11. The distance between successive crests of a wave, especially electromagnetic waves.
- 13. A pseudoscientific belief advocating that certain features of the universe and living things are best explained by an intelligent cause rather than natural processes.
- 15. A classification system for stars based on their spectral characteristics, indicating temperature and composition.
- 16. The fundamental force of attraction between all masses in the universe, responsible for phenomena such as the orbits of planets and the formation of galaxies.
- 17. A luminous celestial body consisting of plasma held together by gravity, undergoing nuclear fusion in its core.
- 18. Interstellar clouds of dust, hydrogen, helium, and other ionized gases where stars are born.
- 20. A type of galaxy characterized by its irregular shape and lack of defined structure.
- 21. A massive system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity.
- 22. Wave Electromagnetic radiation within the visible spectrum that stimulates the sense of sight.
- 23. Ray High-frequency electromagnetic radiation emitted by certain nuclear reactions or subatomic particle interactions.
- 27. Information indicating whether a belief or proposition is true or valid.
- 28. High-energy electromagnetic radiation with wavelengths shorter than those of ultraviolet light.
- 29. The perceived intensity of light emitted by a celestial object.