Earth ________ on its axis once a day.

Day and night are caused by ___________.

In an eclipse, if you are in the _____________ the sun is totally blocked out.

Earth's rotation is about once every __________ .

The same length of daytime and night happens during the __________.

Earth ____________ around the sun once a year.

We see the moon in its ______________ when it is lit by the sun at different times in its orbit around Earth.

The darkest part of the eclipse is the __________________ .

When the sun's rays are the most direct it is _____________ in the Northern hemisphere.

The solstice happens ___________ a year.

There are ________ high tide(s) and __________ low tide(s) every day .

During a solar eclipse, the __________ is hidden in shadow.

You can watch a __________ eclipse without special equipment.

The word __________ comes from the Greek word for "wanderer"

Ptolemy made a model of the solar system with Earth in the center with a _______ model.

Copernicus made a model of the solar system with sun in the center with a _______ model.

A planet orbits the sun in a(n) _____________.

The part of the sun we see is the ______________.

The sun’s ________ contains the chromosphere, photosphere and the corona.

The part of the sun we see is the ________, the surface of the sun.

During a total eclipse, you can see the ________ flying millions of kilometers out into space.

The two things that keep planets in orbit are inertia and ________.

The tendency for a moving thing to keep moving in a straight line is ____________.

Sunspots are _______ parts of the sun.

Solar wind could harm astronauts and disrupt ________.