The sun is the largest object in our solar system.

The innermost layer of the sun's atmosphere is called the photosphere.

The outermost layer of the sun's atmosphere is called the chromosphere.

Solar flares are similar to volcanoes on Earth.

Polaris is an important star in navigation because it is almost directly above the South Pole.

An orbit is a path an object takes as it rotates around a star, planet, or moon.

The orbits of the planets have a slightly elliptical, or oval, shape.

The force of the sun's gravity is large enough to keep planets around the sun.

Which of the planets are part of the "inner planets"?

Select all that apply.

The inner planets have a ____ surface.

Which of the planets are part of the "outer planets"?

Select all that apply.

The outer planets have a ____ surface.

Earth rotates , or spin, on an axis.

Earth rotates on its axis from east to west.

As the moon completes one rotation, it also completes one revolution around Earth.

Synchronous rotation causes the same side of the moon to always face Earth.

Which phase of the moon is shown?

Which phase of the moon is shown?

Which phase of the moon is shown?

Which phase of the moon is shown?

Which phase of the moon is shown?

Which phase of the moon is shown?

Which phase of the moon is shown?

Which phase of the moon is shown?

An eclipse occurs when one object is space passes between the Earth and another object, and casts its shadow on the other object.

Sometimes the moon and the sun are on exactly opposite sides of Earth, causing a lunar eclipse to occur where the moon passes through Earth's shadow.