Across
- 1. The solar wind causes parts of the comet to vaporize and pushes them off the comet's surface. This forms the _______ of the comet.(p.203-204)
- 4. The tilted planet. (p.201)
- 8. The circular path of one object around another object. An object revolving around another object. (p.172)
- 14. The red planet. (p.199)
- 15. In 1977, the ___________ 1 and 2, left Earth on a mission to observe and study the four outer planets. They continue to travel beyond these planets, and they contain pictures, songs, and stories about people on Earth. (p.227)
- 16. The distance of 9.5 trillion, is the distance that light travels in one year is called a _______________ (make it one word). (p.175)
- 19. Chunks of loosely held rock and ice that come from the outer parts of the solar system. (p.203-204)
- 21. Astronomers call Earth's position in the solar system the "____________" zone. (p.186)
- 23. The giant planet. (p.201)
- 24. Green plants need sunlight for _____________________. (p.187)
- 26. Everything that exists. Stars, planets, all matter, and the empty space surrounding them. (p.172)
- 28. This is Canada's main contribution to the ISS. It has helped build and maintain the ISS. It can be controlled by astronauts form inside the ISS. (p.212)
- 30. The correct order of the ______ planets is Jupiter, Saturn, Uranus, and Neptune. (p.200)
- 32. The turning of an object around an imaginary axis running through it. Earth's rotation around its axis takes 24 hours. Refer to diagram. (p.416)
- 34. The hottest planet. (p.199)
- 36. An example of a ________ planet is Pluto. This object is larger than an asteroid but smaller than a planet. This object does NOT dominate its orbit.(p.202)
- 37. A collection of many billions of stars, plus gas and dust held together by gravity. (p.173)
- 38. The ringed planet. (p.201)
- 39. This satellite helps track asteroids that could possibly collide with the Earth. It also keeps an eye on other satellites to prevent collisions. (p.211)
Down
- 2. A _______ eclipse occurs when Earth moves directly between the Sun and the Moon. (p.191)
- 3. The Moon has _ _ _ _ phases. The first quarter, full moon, last quarter, and new Moon. (p.188)
- 5. The four outer planets are large and have __________ around them. (p.200)
- 6. A _______ eclipse is when the Moon moves directly between the Sun and the Earth. (p.190)
- 7. This country provides astronauts, robots, telescopes, and financial support for space exploration. (p.210-213)
- 9. The Sun is about FIVE __________ years old. (p.184)
- 10. The living planet. (p.199)
- 11. Any part of a meteoroid that lands on Earth.(p.203)
- 12. The _____________ unit is a measurement equal to the distance between the Sun and Earth. About 150 million km! (p.174)
- 13. This star is used to tell direction, and is located in the tail of the constellation Ursa Minor. Another name for this star is the North Star. (p.170-171)
- 17. The Sun is made up mostly of _____________. (p.184)
- 18. The _______ revolves (orbits) around the Earth, and reflects the light of the Sun.(p.188)
- 20. The Smallest planet. (p.199)
- 22. A rocky object, located between the orbits of Mars and Jupiter, that orbits the Sun. (p.202)
- 25. The four inner planets are small and _____________.(p.198)
- 27. The correct order of the ______ planets is Mercury, Venus, Earth, and Mars. (p.198)
- 29. The Earth is located in the ___________ Way galaxy. (p.173)
- 31. The life expectancy of the Sun is about _ _ _ billion years.(p.184)
- 33. The deep blue planet. (p.201)
- 35. This object orbits one or more stars, is spherical, and does not share its orbit with another object. (p.415)
- 38. A massive ball of superheated gases that radiates heat and light. (p.172)
- 40. The distance between the _____ and Earth is about 150 000 000 km. (p.184)