An astronaut standing on the Moon's terminator would observe which of the following phenomena?

The Earth completely blocking the view of the Sun during a solar eclipse.

The Sun directly overhead at its highest point in the lunar sky.

A complete and total darkness with no visible light from the Sun.

The Sun appearing on the horizon, as if it were rising or setting.

An astronaut on a lunar mission reports being at a location where the Sun is just beginning to appear over the horizon. Where is the astronaut located?

In the center of a large crater.

A permanent, stationary line where the 'dark side' begins.

The edge of the shadow cast by the Earth onto the Moon.

A moving boundary between sunlight and darkness.

A physical canyon or trench that circles the Moon.

The Moon's magnetic field and the solar wind.

The Earth's shadow and the Moon's orbital speed.

The spherical shape of the Moon and the fact that light travels in straight lines.

The reflection of light from Earth and the composition of the lunar surface.