| A | B |
|---|
| photosynthesis | the use of sunlight by plants to make food |
| satellite | a body that moves around a larger one in space |
| crater | a bowl shaped hole |
| rotate | spin around an axis |
| rotation | spinning around an axis |
| axis | an imaginary line around which something spins |
| revolution | the movement of body traveling around another body |
| revolve | move around another body |
| phases | changes we see in the moon's shape |
| crescent phase | a phase of the moon in which we see less than half of the moon's face |
| gibbous phase | a phase of the moon in which we see more than half of the moon's face |
| umbra | dark part of a shadow |
| preumbra | the lighter shadow around an umbra |
| eclipse | what happens when one body in space blocks the sun's light from reaching another body |
| lunar eclipse | an eclipse of the moon |
| total eclipse | an eclipse of the sun in which the sun's entire face is darkened |
| partial eclipse | an eclipse of the sun in which only part of the sun's face is darkened |
| nuclear reaction | a reaction in which the nuclei of atoms change |
| thermonuclear fusion | a reaction in which the nuclei of atoms combine |
| fuse | combine |
| photosphere | the innermost layer of the sun's atmosphere |
| sunspot | a dark, cooler area of the sun's surface that appears to move |
| sunspot group | several sunspots in an area formed by the break- up of one sunspot |
| solar flare | the release of energy from the outer part of the sun's atmosphere above a sunspot |
| cosmic rays | streams of particles found in atoms,which are released from solar flares |
| chromosphere | the weak, red layer of the sun's atmosphere next to the photosphere |
| prominence | a flame like cloud of gas that shoots up from the chromosphere |
| corona | the layer of the sun's atmosphere farthest from the sun |
| planet | a large body that moves around the sun |
| space probe | an unmannned device sent close to the planets to make observations |
| astriods | broken chunks of rocks that orbit the sun |
| Ceres | the largest astroid |
| comet | a mass of rocks and gases that orbits the sun |
| meteor | a rock that enters the earth's atmosphere |
| meteorite | a meteor that hits the earth's surface |
