| A | B |
|---|
| universe | everything that exists |
| telescope | a device that collects light and makes distant objects appear closer and larger |
| refraction | the bending of waves as they go from one substance to another |
| reflection | the bouncing of waves off a surface |
| wavelength | the distance from one peak to the next on a wave |
| frequency | the number of waves that pass through a point in a secound |
| electromagnetic spectrum | waves of light order by wavelength |
| rotation | a complete spin on an axis |
| International Date Line | the 170 degree line of longetude |
| standerd time zone | a belt 15degrres wide in longetude in which all places have the same time |
| revolution | one complete trip around the Sun |
| phase of the Moon | the shape lighted part of the Moon seen from Earth at any time |
| lunar eclipse | a blocking of a view of the Sun when Earth passes through the Moons shadow |
| solar eclipse | blocking out of a view of the Sun when Earth passes through the Moon |
| tide | the regular rise and fall of the water level along the shoreline |
