Across
- 4. a massive, compact astronomical object so dense that its gravity prevents anything from escaping, even light
- 6. the phenomenon where light from an object moving towards an observer appears shifted towards the blue end of the electromagnetic spectrum, meaning shorter wavelengths and higher frequencies
- 8. matter and anti-matter were being created equally out of the radiation pair production
- 9. the apparent shift or change in an object's position when viewed from different locations or perspectives
- 13. gravity, electromagnetism, the strong nuclear force, and the weak nuclear force
- 15. a branch of physics and metaphysics dealing with the nature of the universe, the cosmos
- 16. variable stars, known for their pulsating nature, exhibit a period-luminosity relationship
- 19. a theory of exponential expansion of space in the very early universe
- 21. matter composed of the antiparticles (or "partners") of the corresponding particles in "ordinary" matter
- 22. the area around, within, and between objects, forms, and lines, encompassing both positive (occupied) and negative (empty) areas
- 25. a unit of distance, not time, representing the distance light travels in one year, approximately 9.46 trillion kilometers or 5.88 trillion miles
Down
- 1. the average density of matter required for the Universe to just halt its expansion, but only after an infinite time
- 2. the phenomenon where the light from distant objects, like galaxies, appears shifted towards the red end of the electromagnetic spectrum, indicating that these objects are moving away from us due to the expansion of the universe
- 3. the degree or intensity of heat present in a substance or object
- 5. an instrument that measures the strength of electromagnetic radiation in the range from ultraviolet to infrared and including the visible spectrum
- 7. the early, hot, and dense state of the universe
- 10. the base unit for temperature in the International System of Units
- 11. a theoretical point or region of space where the density of matter and the curvature of spacetime become infinite
- 12. a branch of Physics, that deals with the electromagnetic force that occurs between electrically charged particles
- 14. the change in the frequency of a wave in relation to an observer who is moving relative to the source of the wave
- 17. what a clock reads, or the measure of change or the interval over which change occurs
- 18. empty space
- 20. a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity
- 23. deals with the separation of the positive and negative electric charges found in any electromagnetic system
- 24. a mysterious, invisible substance that makes up a significant portion of the universe's mass, estimated at around 85%