Origin of the Universe

4. The point nearest Earth's center in the orbit of the Moon or an artificial satellite
6. Earth period of time extending from about 4.6 billion years ago
8. a regular oval shape
9. a huge collection of gas, dust, and billions of stars and their solar systems
10. the slow change in the direction of Earth's rotational axis.
14. Eclipse happens when the Moon passes between the Sun and Earth, casting a shadow on Earth that either fully or partially blocks the Sun's light in some areas
16. The motion of an object around a point, especially around another object or a center of mass
19. having or representing the earth as the center, as in former astronomical systems.

1. The point farthest from Earth's center in the orbit of the Moon or an artificial satellite.
2. that the universe began as just a single point, then expanded and stretched to grow as large as it is right now—and it is still stretching!
3. having or representing the sun as the center, as in the accepted astronomical model of the solar system.
5. the branch of science that deals with celestial objects, space, and the physical universe as a whole
6. of the Moon
7. Hypothesis idea that a spinning cloud of dust made of mostly light elements, called a nebula, flattened into a protoplanetary disk, and became a solar system consisting of a star with orbiting planets
11. the action of rotating around an axis or center.
12. rocky, airless remnants left over from the early formation of our solar system about 4.6 billion years ago
13. frozen leftovers from the formation of the solar system composed of dust, rock, and ices
15. Eclipse occurs when the Sun, Earth, and Moon align so that the Moon passes into Earth's shadow
17. Waves a mechanical wave of acoustic energy that travels through the Earth or another planetary body
18. he curved path of a celestial object or spacecraft around a star, planet, or moon,