When astronauts travel into space, they can still see Earth and the moon. why is this possible?

A. The sun shines in the windows of their space vehicle.
B. They view earth and moon through a telescope.
C. The sun's light reflects off earth and the moon.
D. The astronauts look at earth and the moon with binoculars.

The correct answer is C. The sun's light reflects off Earth and the moon.

When astronauts travel into space, they can still see Earth and the moon because the sun's light reflects off these celestial bodies. Even though space is dark, the sun constantly emits light in all directions, including towards Earth and the moon. This light travels through space and reaches the astronauts' location. As a result, they are able to see Earth and the moon just like we can see them from the surface of our planet.

It's important to note that astronauts do not rely on the sun shining in the windows of their space vehicle (Option A) or using a telescope (Option B) to view the Earth and moon. The reflection of sunlight off these celestial bodies provides sufficient illumination for the astronauts to see them without the need for any additional aids like binoculars (Option D).