1. Astronomy Review
7th Grade Science

2. Love the Earth! It takes the Earth 24 hours to rotate on its axis.
The Earth’s rotation on its axis causes night and day.
For the Earth to make one full revolution around the sun, it takes about one year, or days.

3. The Reason for the Seasons
The reason for the seasons on Earth is due to the tilt of the axis as it moves around the sun.
During a full moon a lunar eclipse can occur.
The differences in how much the moon pulls on different parts of the Earth causes the tides.

4. Under the moonlight…
It is easier to see a lunar eclipse than a solar eclipse due to the fact that you must be in the moon’s shadow to see a solar eclipse.
The moon includes:
Marias
Highlands
Craters

5. So, you want space travel???
Accommodations for space travel include:
Spacesuits that handle a wide variety of temperatures
Methods to move around
Dealing with zero gravity
Because astronauts do not have protection of the Earth’s atmosphere, they must wear spacesuits to protect them from solar radiation.

6. On Earth we need… For life on Earth, it is necessary to have:
Water
Proximity to the sun
Atmosphere containing gases living things need
An equinox occurs when neither of the poles are pointed towards the sun.

7. Layers of the Atmosphere
The Troposphere
Is 7 miles up
The closest layer to Earth
Contains 75% of our atmospheric gases
Has weather, clouds, and smog

8. Layers of the Atmosphere
The Thermosphere
50 miles and upward
Warmest layer of the atmosphere
Contains the ionosphere and exosphere
Reflects radio waves

9. Layers of the Atmosphere
The Stratosphere
Jet stream is located here
Little to no water vapor
7-30 miles upward
The ozone layer is located here

10. Vocab, vocab, vocab!!! Maria
Vast, dark plains on the moon made of basalt
Axis
Imaginary line passing through the center of a planet that the planet spins around
Orbit
Path an object follow in spaces as it revolves around another object
Solar Eclipse
Occurs when the moon passes between Earth and the sun, blocking the sun’s light from Earth
Tide
The daily rise and fall of the oceans caused mainly by the gravitational pull of the moon

11. Vocab, vocab, vocab!!! Spring tide
Tides that are the most extreme, occur twice a month at full and new moon phases
Neap tide
Tides that are the least extreme, happen twice a month, at first and last quarter moon phases
Solstice
One of two days in the year when hours of daylight and hours of darkness are at their greatest and least
Rotation
Spinning of a planet, moon, or sun or other object around its axis
Crater
A bowl-shaped hollow in the ground, caused by a volcano or by a meteor strike

12. Which season? A = Summer B = Fall C = Winter
D = Spring; Not visible due to the position of the sun

13. Did someone say moon phases?
Letter A = new moon
Letter C =full moon
A lunar eclipse would = C
A solar eclipse would = A
Neap tide = BD
Spring tide = AC

14. Pictured above is a SPRING tide
The tides that bind
Pictured above is a SPRING tide

15. Is there a man on the moon?
The moon takes 29.5 days, or one month to rotate around the Earth.
We can see the moon each day because the Earth rotates on its axis so that it the same moon phase can be seen by all.
Because it takes the moon the same amount of time to rotate and revolve, we see the SAME side of the moon.

16. Astronomy Trivia!
When the north end of Earth’s axis is pointed to the sun, there are more DIRECT rays and LONGER days.
The phase of the moon that you see depends on the how much of the sunlit side of the moon faces Earth.
Solar eclipse = moon directly between Earth and the sun.
You are less likely to see a solar eclipse because you must be in the moon’s shadow to see a solar eclipse.