______________ waves are a type of mechanical wave, and therefore, they cannot travel through empty space and matter.

The ___________ is 300,000 km/s in a vacuum.

In a ________________ telescope, light passes through double convex lenses.

Because the Hubble Space Telescope uses concave mirrors, it is a good example of a ________________ type of telescope.

The moon is an example of a/an _____________ satellite of Earth.

A/an _______________ satellite is one that is built and launched by humans.

A ______________ has a burning chamber and a nozzle.

Look at the picture. Letter "A" can best be described as . . .

Look at the picture. Letter "D" can best be described as . . .

Look at the picture. Letter "C" can best be described as . . .

Look at the picture. Letter "E" can best be described as (Hint: this is being sent into space and will not return to Earth).

Look at the picture. Letter "B" can best be described as . . .

When the moon moves between the Earth and the Sun and you can't see the Sun for a while, there is a/an ______________.

When the moon moves behind the Earth and Earth casts its shadow on the moon, there is a/an ____________.

Look at the diagram. This type of eclipse is a

Look at the diagram. This is an example of a

Earth is a ______________, which is a round, three-dimensional object.

The imaginary line around which the Earth spins is called a/an _______________.

Earth's yearly orbit around the Sun is called its ____________.

In the Northern hemisphere, the _____________ occurs on June 21 or 22. It is the "longest" day of the year.

When ALL of the moon's surface that faces Earth is lit up, there is a

The phase of the moon that comes right before the New Moon is the ______________.

More of the lighted surface of the moon is seen from Earth during a

______________ are dark-colored, flat regions on the surface of the moon.

It takes the moon approximately one _____________ to complete a moon cycle (from New Moon to the next New Moon).

The ____________ is the darker, smaller shadow of an eclipse.

Identify this moon phase . . .

Identify the moon phase . . .

Identify the moon phase . . .

Identify the moon phase . . .

Identify the moon phase . . .

Identify the moon phase . . .

Identify the moon phase . . .

Identify the moon phase . . .

Apollo 13 was the first mission that landed men on the moon.

In the Northern Hemisphere, the Fall Equinox is the first day of Spring.

Seasons occur only because of the distance the Earth is from the Sun along its orbital path (revolution).

A total solar eclipse can be viewed by anyone on the daytime side of the Earth.

A total Lunar Eclipse can be viewed by anyone on the nighttime side of the earth (as long as it isn't cloudy).