Across
- 3. the point in the orbit of a planet at which the planet is farthest from the sun
- 7. Equinox the equinox in spring, on about March 20 in the northern hemisphere and September 22 in the southern hemisphere
- 8. the study of the origin, properties, processes, and evolution of the universe
- 11. one of 88 regions into which the sky has been divided in order to describe the locaions of celestial objects; a group of starts organzied in a recongnizable pattern
- 13. the bending of a wavefront as the wavefront passes between two substances in which the speed of the waves differs; also the process by which ocean eaves bend directly toward the coastline as they approach shallow water
- 14. the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.
- 16. having a wavelength shorter than that of the violet end of the visible spectrum but longer than that of X-rays.
- 17. an instrument that collects electromagnetic radition from the sky and concentrates it for better observation
- 18. Unit the average distance between the Earth and the sun; approximately 150 million kilometers
- 21. Bang Theory the theory that all matter and energy in the universe was compressed into an extremely small volume that 13 billion to 15 billion years ago exploded and began expanding in all directions
- 22. X-ray Observatory previously known as the Advanced X-ray Astrophysics Facility (AXAF), is a space observatory launched on STS-93 by NASA on July 23, 1999. Chandra is sensitive to X-ray sources 100 times fainter than any previous X-raytelescope, enabled by the high angular resolution of its mirrors.
- 23. the distance that light travels in one year; about 9.46 trillion kilometers
- 26. telescopes that gathers and focuses light, mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct view, or to make a photograph, or to collect data through electronic image sensors.
- 27. Equator the projection into space of the earth's equator; an imaginary circle equidistant from the celestial poles.
- 29. the spin of a body on its axis
- 30. Webb Space Telescope previously known as Next Generation Space Telescope (NGST), is a flagship-class space observatory under construction and scheduled to launch in October 2018.
Down
- 1. the moment when the sun appears to cross the celestial eqator
- 2. Space Telescope is a space telescopethat was launched into low Earth orbit in 1990, and remains in operation.
- 3. the scientific study of the universe
- 4. Solstice the solstice that marks the onset of summer, at the time of the longest day, about June 21 in the northern hemisphere and December 22 in the southern hemisphere.
- 5. telescope a telescope that uses a curved mirror to gather and focus light from distant objects
- 6. the motion of a body that travels around another body in space; one complete trip along an orbit
- 9. Solstice the solstice that marks the onset of winter, at the time of the shortest day, about December 22 in the northern hemisphere and June 21 in the southern hemisphere
- 10. Spectrum all of the frequencies or wavelengths of electromagnetic radiation
- 12. the point in the orbit of a planet at which the planet is closet to the sun
- 15. Space Telescope formerly theSpace Infrared Telescope Facility (SIRTF), is an infrared space observatory launched in 2003. It is the fourth and final of the NASA Great Observatories program.
- 19. Gamma Ray Observatory was a space observatory detecting light from 20 keV to 30 GeV in Earth orbit from 1991 to 2000.
- 20. the point at which the sun is as far north or as far south of the equator as possible
- 24. a collection of stars, dust, and gas bound together by gravity
- 25. Equinox the equinox in autumn, on about September 22 in the northern hemisphere and March 20 in the southern hemisphere.
- 28. an event in which the shadow of one celestial bod falls on another
- 31. Way Galaxy the galaxy of which the sun and the solar system are a part and which contains the myriads of stars that create the light of the Milky Way.