Space cross word

3. an optical instrument that makes distant objects appear magnified.
5. Year a unit of astronomical distance equivalent to the distance that light travels in one year
8. Model the view that proposed the Sun as the center of the solar system.
14. Spectrum the range of frequencies of electromagnetic radiation and their respective wavelengths and photon energies.
15. an imaginary line about which a body rotates.
17. System the gravitational bound system of the Sun and the objects that orbit it, either directly or indirectly
18. an astronomical body orbiting Earth as its only natural satellite.
19. Planet A celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
20. an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called out gassing.

1. all of space and time and their contents
2. an object that has been intentionally placed into orbit.
4. a fixed luminous point in the night sky which is a large, remote incandescent body like the sun.
6. Model a superseded description of the Universe with Earth at the center.
7. Cloud a theoretical cloud of predominantly icy planetesimals proposed to surround the Sun at distances ranging from 2,000 to 200,000 au
9. Bang Theory the leading explanation about how the universe began
10. Calendar the calendar used in most of the world.
11. Belt 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.
12. the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.
13. a property of a physical body and a measure of its resistance to acceleration when a net force is applied.
16. an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity