big bang theory

2. the simplest, lightest, and most abundant chemical element in the universe
4. the scientific study of everything outside Earth's atmosphere
5. an American astronomer who proved the existence of other galaxies and discovered that the universe is constantly expanding
10. an artist who transcends convention by weaving performance, visual art, and design into immersive tapestries of image and sound.
13. the faint echo of thermal energy left over from the Big Bang
16. a massive, gravitationally bound system consisting of stars, stellar remnants, interstellar gas, dust, and dark matter
17. a colorless, odorless, tasteless, and inert noble gas
18. a German-born theoretical physicist who revolutionized modern physics by redefining gravity as the curvature of space-time

1. Nobel Prize-winning radio astronomer who discovered the Cosmic Microwave Background
3. British astronomer and mathematician famous for establishing the theory of stellar nucleosynthesis—proving that heavy elements are created inside stars
6. the entire range of all possible frequencies of electromagnetic radiation
7. all space, time, matter, and energy that exists
8. the segment of the electromagnetic spectrum that is detectable by the human eye
9. the prevailing cosmological model explaining the origin and evolution of the universe
11. a scientific instrument that splits light (or other radiation) into its component wavelengths/colors
12. the ability to do work
14. the stretching of light waves (increasing wavelength) towards the red end of the spectrum (away from the observer)
15. a phenomenon where light from an object moving toward an observer shifts toward shorter, higher-frequency wavelengths