Across
- 4. a galaxy with many long “arms” spiralling out from a centre core made up of stars that
- 5. a star much fainter than the Sun (2 words)
- 11. the seventh-brightest star in the night sky and the brightest star in the constellation of Orion
- 12. a galaxy that ranges in shape from a perfect sphere to an elongated but flattened ellipse and contains some of the oldest stars in the universe (2 words)
- 16. a multiple star some 1,200 light years from the Sun in the constellation of Orion(2 words)
- 17. 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 (2 words)
- 18. a cloud of gas and dust in space
- 19. the distance that light, which moves at 300 000 km/s, travels in a year; equals about 9.5 trillion km (2 words)
- 23. the ninth-brightest star in the night sky and second-brightest in the constellation of Orion
- 25. states that the universe is closed and will go through a series of expansions and contractions, or Big Bangs and Big Crunches, in an ongoing cycle (2 words)
- 26. long ago
Down
- 1. a star much brighter than the Sun (2 words)
- 2. a region of extremely high energy that develops as the supermassive black hole in the centre of a galaxy attracts more matter into itself
- 3. the coming together of two stars caused by gravity, gravitational radiation, and other mechanisms(3 words)
- 6. the theory that the solar and stellar systems were developed from a primeval nebula(2 words)
- 7. the gradual development of something, especially from a simple to a more complex form
- 8. an enormous collection of gases, dust, and billions of stars held together by gravity
- 9. the brightest star in the southern constellation of Carina, and the second-brightest star in the night-time sky
- 10. the theory that proposes that the universe formed approximately 13.7 billion years ago when an unimaginably tiny volume of space suddenly and rapidly expanded to immense size (3 words)
- 13. analyzing the shifting of light from an object toward the red (longer wavelength) end of the spectrum as the object moves away from Earth to understand its distance (3 words)
- 14. an explanation of an event that has been supported by consistent, repeated experimental results and has therefore been accepted by most scientists
- 15. a large sphere of incredibly tightly packed material with an extraordinary amount of gravitational pull created when a star collapses into itself; called “black” because nothing, not even light, can escape the powerful gravitational field (2 words)
- 20. the brightest star in the constellation of Lyra, the fifth-brightest star in the night sky, and the second-brightest star in the northern celestial hemisphere
- 21. the first scientist to identify other galaxies besides the Milky Way (2 words)
- 22. the brightest star in the constellation of Boötes, the fourth-brightest in the night sky, and the brightest in the northern celestial hemisphere
- 24. the brightest star in the constellation of Ursa Minor and the current northern pole star