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The Moon's Changing Faces

Science · Space Systems & Earth's History · ages 11-12

Name ______________________ Date ____________

Which event is a lunar eclipse?
- Earth's shadow falls on the Moon during a full Moon.
- The Moon's shadow falls on Earth during a new Moon.
- The Moon's own light switches off for an entire month.
What causes the Moon's ordinary phases?
- Earth's shadow covering a different part of the Moon each night
- Our changing view of the Moon's sunlit half as it orbits Earth
- Changes in the Moon's actual size as it moves through space
A solar eclipse happens at every new Moon.
Circle one: True False
Which phase follows first quarter as the sunlit part visible from Earth increases toward full Moon?
- Waxing Gibbous
- Waning Crescent
- New Moon
About how many days pass, on average, from one new Moon to the next? Give the value taught in the lesson, to the nearest tenth of a day.
Answer: ______________
Maria watches an animation showing the Moon pass in front of the Sun. Its shadow reaches part of Earth. What event does the animation show?
- A solar eclipse, with the Moon between the Sun and Earth
- A lunar eclipse, with Earth between the Sun and the Moon
- An ordinary new Moon, with no shadow reaching Earth's surface
Tonight is full Moon. About 22 days pass, roughly three quarters of a phase cycle. Which phase should you expect near that time?
- Full Moon again
- New Moon again
- First Quarter
Diego says, 'First quarter means one quarter of the Moon's visible disk is lit.' Which correction should he make?
- Three quarters of the visible disk is lit at first quarter.
- Half the visible disk is lit at first quarter.
- All of the visible disk is lit throughout first quarter.

Answer key

For grown-ups. Fold this page away before handing over the rest.

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Earth's shadow falls on the Moon during a full Moon. · In a lunar eclipse, Earth is between the Sun and Moon and Earth's shadow reaches the Moon.
Our changing view of the Moon's sunlit half as it orbits Earth · The Moon reflects sunlight. Its orbit changes how much of its sunlit half we see from Earth.
False · The Moon's orbit is tilted. At most new Moons, its shadow misses Earth, so there is no solar eclipse.
Waxing Gibbous · Waxing gibbous follows first quarter. More than half the visible disk is lit, and the lit portion is increasing.
29.5 · The average phase cycle is about 29.5 days. Individual cycles vary, so this is an average rather than an exact date prediction.
A solar eclipse, with the Moon between the Sun and Earth · The Moon is between the Sun and Earth, and its shadow reaches Earth. Those conditions describe a solar eclipse.
First Quarter · After full Moon, last quarter is about 7 days later, new Moon about 15 days later, and first quarter about 22 days later.
Half the visible disk is lit at first quarter. · At first quarter, half the visible disk is lit. The phase name does not give the fraction of the disk that is lit.