Across
- 4. Phases of the Moon in which the apparent brightness is decreasing
- 8. Slightly flattened circles which describe orbits around two foci
- 9. Big _____ Theory: The origin of our universe, where space, time, and most elements were created about 13 billion years ago
- 11. Cosmic _____ Background: The radiation left over from the Big Bang, filling the universe
- 12. _____ Year: A measure of distance that it would take light to travel in a year, ~10 trillion km
- 13. The point in an orbit where an object is closest to the body it’s orbiting (called perihelion if around the Sun)
- 16. _____ Radiation: The many forms of light radiation emitted in the form or electromagnetic waves
- 17. electromagnetic radiation coming into the Earth from the Sun
- 18. ______'s Laws: Physical laws describing the motion of orbiting bodies in elliptical orbits and the speed at which they revolve
- 19. Phases of the Moon in which the apparent brightness is increasing
- 20. A measure between 0 and 1 that describe how flattened an ellipse is
Down
- 1. A force of attraction between objects dependent on mass and distance
- 2. the production of an element through the fusion of two simpler nuclei
- 3. Changes in sea level based on the Moon and Sun’s gravitational pull on the ocean
- 5. a powerful explosion caused by the collapse of a massive star (nova if a smaller star)
- 6. A large cloud of gas and dust in space, often forming new star systems
- 7. The point in an orbit where an object is farthest from the body it’s orbiting (called aphelion if around the Sun)
- 10. The apparent increase in wavelength of distant stars and galaxies, showing that the universe is expanding
- 14. A measure of brightness of a star
- 15. When either the Sun or Moon is shadowed due to the Sun, Earth, and Moon aligning