| A | B |
|---|
| electromagnetic spectrum | electrmagnetic radiation alighned according to wavelength and frequency |
| refracting telescope | a telescope that uses lenses to bring visible light to a focus where an image can be seen by an observer |
| reflecting telescope | a telescope that uses a mirror to gather and focus light from a distant object |
| interferometry | the process of linking several telescopes together so they can function as one telescope |
| adapt | to change to suit a new purpose |
| albedo | the amount of sunlight that the surface of the Moon reflects |
| highland | mountainous regions of the Moon |
| maria | dark, smooth plains of the Moon |
| impact crater | craters that formed when objects from space crashed onto the Moon's surface |
| ejecta | material that blasted out of the moon's surface and fell back to the surface |
| ray | long trails of ejecta |
| rille | Structure that resemble a valley |
| regolith | loose, ground up rock on the surface of the moon |
| unique | unusual; possessing unique characteristics |
| rilles | valleylike structure that meanders across some regions of the Moon's maria |
| ecliptic plane | the plane of Earth's orbit |
| solstice | the Sun overhead is a its farthest distance |
| equinox | Earth's axis is perpendicular to the Sun's rays and at noon the Sun is directly overhead at the equator |
| synchronous rotation | the state at which the moon's orbital and rotational periods are equal |
| solar eclipse | occurs when the Moon passes directly between the Sun and Earth |
| perigee | moon's orbit is closest to the Earth |
| apogee | moon's orbit is farthest from Earth |
| lunar eclipse | occurs when the Moon passes through Earth's shadow |
| distribute | to spread out so as to cover something |
