Slide 2 // The Moon Mr. Harpers science mini lesson with audio
Click on the speaker icon to hear the words Slide 3 Some planets in
our solar system have moons that orbit around them. Mercury and
Venus dont have a moon. Earth has 1 moon. Mars has 2 moons. Jupiter
has more than 60. Saturn also has more than 60 moons. Uranus has
27. Neptune has 13. Jupiter with its 4 biggest moons. Mars is
orbited by 2 moons Slide 4 // Earth has many man-made satellites in
orbit around it. Some relay TV and telephone signals. Some send
pictures of Earths weather. Slide 5 // The science term for a moon
is natural satellite. But most people call them moons so we will
too. Slide 6 // Earths moon is made of the same kinds of materials
as Earth. It is rocky. But the moon has little or no atmosphere or
water. There is probably no life there at all. Slide 7 Astronauts
from Earth first traveled to the moon in 1969. In all, 12 people
have walked on the moon. The last one was in 1972. Earth Slide 8
Astronauts had to wear pressurized space suits to be able to
breathe, because there is no air on the moon. Even with the sun
shining, the sky is black because there is no atmosphere. Slide 9
The moon has much less mass (its smaller and weighs less) than
Earth. That makes moons gravitational attraction much less than
Earths. A person on the moon would weigh about 1/6 th of their
Earth weight. Slide 10 25,000 miles circumference The moon orbits
at about 220,000 miles from Earth. Thats about 9 times Earths
circumference. (Circumference is the distance all the way around
the Earths equator). Slide 11 // On Earth, we can only see the part
of the moon that is illuminated by sunlight. As the moon orbits
Earth during a month we see the light change. These different looks
are called phases of the moon. Slide 12 // The moon completes a
phase cycle every 28 days because thats how long it take the moon
to orbit Earth. Slide 13 If you are on the moon, Earth has phases
too. These are real photos of Earth taken from the moon. Slide 14
// If you were on the moon you would see Earth turn every 24 hours.
The periods of the moons rotation (spinning on axis), and its orbit
and are the same, about 28 days. The rotation is also in the same
direction as as its orbit. What this means is that the same side of
the moon is always facing Earth. Slide 15 // Only astronauts have
seen the far side of the moon. It is often called the dark side of
the moon but its only dark half the time just like any planet or
moon. Slide 16 Sometimes the moon passes directly between Earth and
the sun. This makes a shadow on parts of Earth called a solar
eclipse. Many people damage their eyes looking directly at the sun
during a solar eclipse. Most sunglasses cant protect you. Moons
shadow Earthss shadow Partial eclipse Total solar eclipse Slide 17
// A lunar eclipse is when Earth is between the sun and moon. It
takes a few hours for the Earths shadow to pass over the moon.
Slide 18 // The moon can help us see on a dark night. The moon
doesnt make light, but it reflects the suns light. Slide 19 //
Another interesting effect of the moon is the changing tides that
happen every day along the coast between land and sea. Slide 20 //
The moon stays in orbit around Earth because of Earths gravity. But
the moons gravity pulls on Earth, too. The liquid ocean changes
shape and bulges a few feet toward the moon during high tide. high
tide low tide Slide 21 Moon Tides on brainpop.com To learn more,
check out these Brainpop cartoons Moon Solar system on
brainpopjr.com
