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space key words
| Term | Definition |
|---|---|
| gravity | the force that attracts a body towards the centre of the earth, or towards any other physical body having mass |
| phases | each of the aspects of the moon or a planet, according to the amount of its illumination, especially the new moon, the first quarter, the full moon, and the last quarter |
| lunar | of, determined by, or resembling the moo |
| waxing | when the silver of the moon starts to appear |
| waning | have a progressively smaller part of its visible surface illuminated, so that it appears to decrease in size |
| crescent | the curved sickle shape of the waxing or waning moon |
| gibbous | having the illuminated part greater than a semicircle and less than a circle |
| debris | scattered pieces of rubbish or remains |
| eclipse | An eclipse is an astronomical event that occurs when one celestial body passes in front of another |
| shuttle | A space shuttle is a retired, partially reusable spacecraft system |
| astronaut | a person who is trained to travel in a spacecraft |