Across
- 5. the distance light travels in one year
- 8. a huge collection of gas, dust, and billions of stars and their solar systems
- 9. region of spacetime where gravity is so strong that nothing has enough energy to escape it
- 11. the observed displacement of an object caused by the change of the observer's point of view
- 13. a branch of physics that deals with heat
- 14. an ongoing and continuous sequence of events that occur in succession, from past through the present, and to the future
- 15. matter composed of the antiparticles of the corresponding particles in ordinary matter
Down
- 1. a branch of physics and metaphysics dealing with the nature of the universe
- 2. an interaction that occurs between particles with electric charge
- 3. the wavelength of the light is stretched, so the light is seen as 'shifted' towards the red part of the spectrum
- 4. a theory of exponential expansion of space in the early universe
- 6. a hypothetical form of matter thought to account for approximately 85% of the matter in the universe
- 7. a term you use when talking about how hot or cold it is outside
- 10. a unit of measurement for temperature
- 12. the number of things in a certain area