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Basics of the Sun Sun is a star that is at the center of our solar system Sun is a star that is at the center of our solar system It is a medium sized,

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Presentation on theme: "Basics of the Sun Sun is a star that is at the center of our solar system Sun is a star that is at the center of our solar system It is a medium sized,"— Presentation transcript:

1 Basics of the Sun Sun is a star that is at the center of our solar system Sun is a star that is at the center of our solar system It is a medium sized, middle aged star It is a medium sized, middle aged star It generates all of the light and heat that we need to survive on Earth It generates all of the light and heat that we need to survive on Earth 100 Earth’s could fit across its equator 100 Earth’s could fit across its equator The Sun has been shining on Earth for about 4.6 Billion years The Sun has been shining on Earth for about 4.6 Billion years Light from the Sun takes a little over 8 minutes to reach Earth Light from the Sun takes a little over 8 minutes to reach Earth

2 Structure of the Sun Sun does not have a solid surface Sun does not have a solid surface Sun is composed of many layers much like the Earth Sun is composed of many layers much like the Earth –Core – The center of the sun. This is where the sun’s energy is produced –Photosphere – This is the visible part of the sun that we can see from Earth –Corona – The Sun’s outer Atmosphere

3 Seasons We have seasons because the Earth is tilted on its axis. We have seasons because the Earth is tilted on its axis. Seasons are not caused by a change in our distance from the sun. Seasons are not caused by a change in our distance from the sun. Seasons are the result of the amount of the sun’s energy we receive as we revolve around the sun. Seasons are the result of the amount of the sun’s energy we receive as we revolve around the sun.

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5 Important Days Summer Solstice – Longest Day of Year, First Day of Summer Summer Solstice – Longest Day of Year, First Day of Summer Winter Solstice – Shortest Day of Year, First Day of Winter Winter Solstice – Shortest Day of Year, First Day of Winter Spring (Vernal) Equinox – Equal Amounts of Day and Night, First Day of Spring Spring (Vernal) Equinox – Equal Amounts of Day and Night, First Day of Spring Autumnal Equinox – Equal Amounts of Day and Night, First Day of Fall Autumnal Equinox – Equal Amounts of Day and Night, First Day of Fall

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7 The Moon Orbits the planet Earth, also known as Luna Orbits the planet Earth, also known as Luna Thought to be about 4.6 billion years old Thought to be about 4.6 billion years old Moon has no atmosphere and its surface is full of craters Moon has no atmosphere and its surface is full of craters ¼ the size of Earth ¼ the size of Earth 240,000 miles from Earth 240,000 miles from Earth Rotates around Earth once every 27 days. Rotates around Earth once every 27 days.

8 Lunar Origins At one time there were three theories: At one time there were three theories: –#1 Moon was a separate body captured by Earth’s gravity –#2 Moon formed at same time and with same materials as the Earth –#3 Part of Earth spun off and became Moon Rock samples brought back from Moon best match up with theory #3 Rock samples brought back from Moon best match up with theory #3


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