Across
- 2. The simplest, lightest, and most abundant chemical element in the universe.
- 4. The study of everything in the universe beyond Earth's atmosphere.
- 5. A groundbreaking American astronomer who proved that other galaxies exist outside the Milky Way and discovered that the universe is constantly expanding.
- 10. American avant-garde theater director, playwright, and visual artist.
- 13. Cosmic Microwave Background radiation is the leftover heat and light from the Big Bang, filling all space in the universe.
- 16. A massive, gravitationally bound system consisting of stars, stellar remnants, gas, dust, and dark matter.
- 17. A colorless, odorless, tasteless, and nonflammable gas that is the second lightest and second most abundant element in the universe.
- 18. German-born theoretical physicist is widely considered one of the most influential scientists of all time.
Down
- 1. German-American physicist and radio astronomer.
- 3. Prominent English astronomer and astrophysicist known for explaining how elements are created inside stars.
- 6. The entire range of all possible frequencies of electromagnetic radiation, which travel in waves and transport energy.
- 7. Absolutely everything that exists: all space, time, matter, and energy.
- 8. The narrow range of electromagnetic radiation that the human eye can perceive, spanning colors from violet to red.
- 9. The leading scientific explanation that the universe began roughly 13.8 billion years ago from an extremely hot, dense point and has been expanding and cooling ever since.
- 11. An instrument that breaks up a wave into a frequency spectrum.
- 12. The capacity or ability to do work, cause change, or move matter.
- 14. The stretching of light waves as an object moves away from the observer, causing the light to shift toward the red end of the spectrum.
- 15. The compression of light waves from an object moving toward an observer, causing its light to shift toward the blue/violet end of the spectrum.