Across
- 2. A chemical element; it has the symbol H and atomic number 1.
- 4. The scientific study of celestial objects (planets, stars, galaxies, black holes) and phenomena originating outside Earth's atmosphere, including their motion, evolution, and composition.
- 5. Often called a "pioneer of the distant stars".
- 10. Made the discovery of cosmic microwave background radiation.
- 13. The "afterglow" or leftover heat from the Big Bang, filling all of space as a faint, uniform microwave signal.
- 16. A huge collection of gas, dust, and billions of stars and their solar systems.
- 17. A gas that has a chemical formula or chemical symbol of He.
- 18. Developed the special and general theories of relativity.
Down
- 1. Made a groundbreaking discovery of cosmic microwave background radiation along with another person.
- 3. Pioneering the theory of stellar nucleosynthesis.
- 6. A fundamental physical force that links electricity and magnetism, occurring when moving electric charges produce magnetic fields.
- 7. The totality of all space, time, matter, and energy.
- 8. The range of waves visible to us as humans within the electromagnetic spectrum.
- 9. The leading explanation for how the universe began.
- 11. An instrument that breaks up a wave into a frequency spectrum.
- 12. The ability to do work.
- 14. Occurs when light from a distant object is stretched towards longer, redder wavelengths, indicating it is moving away.
- 15. The decrease in wavelength (and increase in frequency) of light from an object moving toward an observer.