Understanding the Moon and Earth

Why do we always see the same side of the Moon from Earth?

• The Moon's orbit is perfectly circular.

• The Moon's rotation period matches its orbit around Earth.

• The Moon does not rotate on its axis.

• The Moon is stationary in space.

What causes the different phases of the Moon?

• The Moon's surface changes color.

• The Earth's shadow falls on the Moon.

• The Moon's position relative to Earth and the Sun changes.

• The Moon's distance from the Sun changes.

What is Earthshine?

• The glow of Earth's atmosphere.

• The Moon's light reflecting off the Sun.

• Sunlight reflecting off Earth and illuminating the Moon.

• Light from the Moon reflecting off Earth.

How can Earthshine help us understand Earth's climate?

• By observing changes in Earth's reflectivity.

• By analyzing the color of the Moon.

• By measuring the Moon's temperature.

• By tracking the Moon's orbit.

What might changes in Planet shine indicate about exoplanets?

• The presence of life.

• The existence of continents and oceans.

• The size of the planet.

• The planet's distance from its star.