Phases & Eclipses

Phases & Eclipses

Ch 1 L 4 p. 22-27

What Causes the Moon’s Phases?

• The different shapes of the moon you see from Earth are called phases.

• Phases are caused by the motions of the moon around Earth.

• As the moon orbits Earth, the relative position of the moon, Earth, and the sun change.

Multiple Choice

The different shapes of the moon you see from Earth are called what?

• Eclipses

• Phases

• Lunar Eclipse

• Solar Eclipse

What Causes the Moon’s Phases?

• The changing relative positions of the moon, Earth, and sun cause the phases of the moon.

• The phase of the moon you see depends on how much of the sunlit side of the moon faces Earth.

Multiple Select

The changing relative positions of the what three things cause the phases of the moon?

• Sun

• Moon

• Earth

• Stars

Multiple Choice

The phase of the moon you see depends on how much of what?

• The sunlit side of the moon faces Earth.

• The starlit side of the moon faces Earth

• How much of the sun is shown

• How much of the moon is shown

What Are Eclipses?

• The moon’s orbit around Earth is slightly titled with respect to Earth’s orbit around the sun.

• As a result, the moon travels above and below Earth’s orbit.

• But on rare occasions, Earth, the moon, and the sun line up.

What Are Eclipses?

• When an object in space comes between the sun and a third object, it casts a shadow on that third object, causing an eclipse to take place.

• There are two types of eclipses: solar eclipses and lunar eclipses

Multiple Choice

When an object in space comes between the sun and a third object, it casts a shadow on that third object, causing what?

• Eclipse

• Phase

• Solar Eclipse

• Lunar Eclipse

Multiple Choice

When an object in space comes between the sun and a third object, it casts a shadow on that third object, causing what?

• Eclipse

• Phase

• Solar Eclipse

• Lunar Eclipse

What Are Eclipses?

• A solar eclipse occurs at a new moon when the moon passes directly between Earth and the sun, blocking sunlight from Earth.

• The moon’s shadow hits Earth.

Multiple Choice

What happens when the moon passes directly between Earth and the sun, blocking sunlight from Earth?

• Solar Eclipse

• Lunar Eclipse

What Are Eclipses?

• The moon’s shadow has two parts.

• The darker part is the umbra.

• The larger, lighter part is the penumbra.

Multiple Choice

What is the darker part of the moon?

• Umbra

• Penumbra

Multiple Choice

What is the larger, lighter part of the moon?

• Numbra

• Penumbra

What Are Eclipses?

• During a solar eclipse, the sun’s light is completely blocked to people within the umbra.

• They see a total solar eclipse.

• Part of the sun’s light remains visible in the penumbra.

• So people within the penumbra see a partial solar eclipse.

What Are Eclipses?

• A lunar eclipse occurs at a full moon when Earth is directly between the moon and the sun.

• During a lunar eclipse, Earth blocks sunlight from reaching the moon.

• Lunar eclipse occur only when there is a full moon, because then moon is closest to Earth at that time.

Multiple Choice

During a lunar eclipse, ____________ blocks sunlight from reaching the moon.

• Earth

• Sun

• Moon

Multiple Choice

What is called when Earth is directly between the moon and the sun?

• Solar Eclipse

• Lunar Eclipse

What Are Eclipses?

• Earth’s shadow also has an umbra and penumbra.

• When the moon is in Earth’s umbra, you see a total lunar eclipse.

• For most lunar eclipses, Earth, the moon, and the sun air not quite in line, and only a partial lunar eclipse occurs.

Multiple Choice

For most lunar eclipses, Earth, the moon, and the sun air not quite in line, and only a _______ lunar eclipse occurs.

• partial

• total

• spot

Review Questions

Time to see what you have learned!

Multiple Choice

The different shapes of the moon you see from Earth are called what?

• Eclipses

• Phases

• Lunar Eclipse

• Solar Eclipse

Multiple Select

The changing relative positions of the what three things cause the phases of the moon?

• Sun

• Moon

• Earth

• Stars

Multiple Choice

The phase of the moon you see depends on how much of what?

• The sunlit side of the moon faces Earth.

• The starlit side of the moon faces Earth

• How much of the sun is shown

• How much of the moon is shown

Multiple Choice

What happens when the moon passes directly between Earth and the sun, blocking sunlight from Earth?

• Solar Eclipse

• Lunar Eclipse

Multiple Choice

What is the darker part of the moon?

• Umbra

• Penumbra

Multiple Choice

What is the larger, lighter part of the moon?

• Numbra

• Penumbra

Multiple Choice

During a lunar eclipse, ____________ blocks sunlight from reaching the moon.

• Earth

• Sun

• Moon

Multiple Choice

What is called when Earth is directly between the moon and the sun?

• Solar Eclipse

• Lunar Eclipse

Multiple Choice

For most lunar eclipses, Earth, the moon, and the sun air not quite in line, and only a _______ lunar eclipse occurs.

• partial

• total

• spot