Across
- 2. the simplest, lightest, and most abundant chemical element in the universe.
- 4. the scientific study of everything in the universe outside Earth's atmosphere, including stars, planets, comets, and galaxies.
- 5. a groundbreaking American astronomer who proved that other galaxies exist outside our own and discovered that the universe is expanding.
- 10. influential American avant-garde theater director, playwright, and visual artist
- 13. the "afterglow" or leftover heat from the Big Bang, filling all of space as a faint, uniform microwave signal
- 16. a massive, gravitationally bound system consisting of stars, stellar remnants, gas, dust, and dark matter.
- 17. a very light, colorless, and odorless gas that is commonly used to make balloons float.
- 18. German-born theoretical physicist recognized as one of the most influential scientists in history
Down
- 1. German-born American physicist and radio astronomer
- 3. famous British astronomer and mathematician who explained how elements (like carbon) are created inside stars.
- 6. The electromagnetic (EM) spectrum is the entire range of all types of light radiation, both visible and invisible, organized by wavelength or frequency
- 7. everything that exists, encompassing all space, time, matter, and energy.
- 8. is the segment of the electromagnetic spectrum that the human eye can view
- 9. the leading explanation for how the universe began
- 11. an instrument that splits light (or other radiation) into a spectrum—like a rainbow—and records it.
- 12. the ability to do work or cause change
- 14. the stretching of light waves from an object (like a star or galaxy) moving away from us, making the light appear redder.
- 15. the displacement of the spectrum to shorter wavelengths in the light coming from distant celestial objects moving toward the observer