_________ is classified by wavelength and frequency.

The two main types of optical telescopes are refractors and ________

Space-based astronomy includes the study of orbiting telescopes, __________, and probes.

True or False. Technology originally developed to explore space is now used by people on Earth.

Astronomers have gathered information about the Moon using telescopes, space probes, and

Like Earth's crust, the Moon's crust is composed mostly of

Surface features on the moon do NOT include ___________.

The moon probably formed about 4.5 bya in a collision between Earth and a _________ -sized object.

Earths Rotation makes the Sun and other objects in space appear to _________ each day,

Seasons are caused by the ________ of Earths axis relative to the ecliptic plane as Earth revolves around the Sun

The __________ _________ of the Moon and to a lesser extent the Sun, causes tides.

_______ _______ result from our view of the Moon's lighted side as it orbits Earth.

Solar and lunar _______ occur when the Sun's light is blocked.