| A | B |
|---|
| ASTRONOMY | The study of the moon, stars, and the objects in space. |
| REVOLUTION | The movement of an object around another object. |
| GRAVITY | The attractive force between two objects; its magnitude depends on their masses and the distance between them. |
| STAR | large gaseous (plasma) object that generates its own heat and light through fusion |
| AU - Astronomical Unit | distance between Earth and the Sun; used to more easily compare and measure the distances from the sun for each planet |
| LIGHT YEAR | the DISTANCE light can travel in a year - (at 150,000,000 km/sec - the speed of light) |
| PHOTOSPHERE | the layer of the sun that we can "see"; the sun's surface |
| SUNSPOT | a cooler region on the photosphere |
| CORONAL MASS EJECTION | a massive quantity of the corona that erupts off of the sun dramatically increasing the quantity of solar wind |
| PROMINENCE | Loop of plasma moving through a magnetic field connected by two areas of sun spots |
| CORONA | outer layer of the sun's atmosphere - visible only during an eclipse; hotter than surface of sun |
| FUSION | The energy-creating process in the sun's core combining hydrogen nuclei to create helium nuclei |
