Across
- 3. An explanation of the origin of the universe starting that it started small and expanded over billions of years
- 4. An imaginary line that runs through the middle of an object around which that object rotates; a line at the side or bottom of a graph.
- 6. a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars, that is occupied by a great many solid, irregularly shaped bodies, of many sizes but much smaller than planets, called asteroids or minor planets.
- 8. a fixed luminous point in the night sky which is a large, remote incandescent body like the sun.
- 9. the quantity of matter which a body contains, as measured by its acceleration under a given force or by the force exerted on it by a gravitational field.
- 10. the distance that travels in one year.
- 11. the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
- 13. The curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.
- 14. a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.
- 15. all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light-years in diameter and contains a vast number of galaxies; it has been expanding since its creation in the Big Bang about 13 billion years ago.
- 19. an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication.
- 20. The branch of science which deals with celestial objects, space, and the physical universe as a whole.
Down
- 1. The most widely accepted and used civil calendar internationally
- 2. Oort cloud, is a theoretical cloud of predominantly icy planetesimals proposed to surround the Sun at distances ranging from 2,000 to 200,000 au.
- 5. a celestial body moving in an elliptical orbit around a star.
- 7. a region of the solar system beyond the orbit of Neptune, believed to contain many comets, asteroids, and other small bodies made largely of ice.
- 8. A scale factor is a number which scales, or multiplies, some quantity. ... In the field of measurements, the scale factor of an instrument is sometimes referred to as sensitivity.
- 12. A natural satellite of a planet; an object that revolves around a planet.
- 16. A region of the electromagnetic radiation spectrum where wavelengths range from about 700 nanometers to 1 millimeter.
- 17. A large system of dust, gas, stars, and other celestial bodies that has a particular shape
- 18. An optical instrument designed to make distant objects appear nearer.