Across
- 5. a fixed luminous point in the night sky which is a large, remote incandescent body like the sun.
- 8. the process of combining two or more distinct entities into a new whole
- 11. a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
- 12. theory is the prevailing cosmological model explaining the existence of the observable universe
- 14. a celestial object of very small radius (typically 18 miles/30 km) and very high density
- 15. the force that attracts a body toward the center of the earth, or toward any other physical body having mass.
- 16. a region of space having a gravitational field so intense that no matter or radiation can escape.
- 17. a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure.
- 18. a band of colors, as seen in a rainbow, produced by separation of the components of light by their different degrees of refraction according to wavelength the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
Down
- 1. a star showing a sudden large increase in brightness and then slowly returning to its original state over a few months.
- 2. supergiant star, any star of very great intrinsic luminosity and relatively enormous size
- 3. a highly magnetized rotating neutron star that emits beams of electromagnetic radiation
- 4. a star with substantially larger radius and luminosity than a main-sequence star of the same surface temperature.
- 5. a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms.
- 6. the displacement of spectral lines toward longer wavelengths
- 7. a change in frequency due to the Doppler effect.
- 9. a system of two stars in which one star revolves around the other or both revolve around a common center.
- 10. eruptions on the sun that occur when magnetic lines twist and suddenly realign near the visible surface
- 13. a very young star that is still gathering mass from its parent molecular cloud
- 15. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.