Presentation on theme: "THE SUN, The EARTH, THE MOON (and other space things!) 4 th Grade Science Duncan Elementary."— Presentation transcript:
THE SUN, The EARTH, THE MOON (and other space things!) 4 th Grade Science Duncan Elementary
THE SOLAR SYSTEM The Sun is at the center of our Solar System, and 8 planets revolve around the Sun in a circular or elliptical orbit. Our Earth is the third planet from the Sun, and the only planet in the Solar System with plants, animals, and people! Mercury Venus Earth Mars Jupiter Saturn Neptune Uranus
THE SOLAR SYSTEM AND THE MILKY WAY Our Solar System is a very small part of a VERY LARGE collection of stars, planets, and space, called the MILKY WAY GALAXY. The Milky Way Galaxy is a very small part of the UNIVERSE, whose size cannot be determined with certainty. MILKY WAY GALAXY THE UNIVERSE
LIVING THINGS ON SOLAR SYSTEM PLANETS? Because they are so close to the Sun, planets Mercury and Venus are too hot for plants, animals and people to live there. Because they are so far from the Sun, Jupiter, Saturn, Neptune and Uranus are too cold for most living things. Mars is colder than Earth, and various studies have been conducted to determine whether there are any living things on the Red Planet. Mercury Venus Earth Mars Jupiter Saturn Neptune Uranus
THE STARS IN THE SKY On a cloudless night, away from city lights (or using a telescope), you would be able to see millions of stars in the sky. Some stars are brighter and closer than others. These stars are so far away that the light from these stars took hundreds or thousands of years to reach the Earth. Some bright stars form a pattern called a CONSTELLATION that looks like a person, animal or thing. The most common one we see in our sky is the BIG DIPPER that looks like a large spoon or soup ladle.
OTHER INTERESTING THINGS IN THE SKY At night, we can get a great view of the MOON, in one if its many phases (more about that later!) Sometimes, we can see a METEOR flash through the sky and burn up as it approaches the Earth. Earth is sometimes visited by one of several COMETS that make their way around the Sun. At times, we may see a bright object that is a PLANET with sunlight reflecting off its surface. …but you would need to look really hard to see an astronaut cat outside the orbiting International Space Station!
FACTS ABOUT OUR SUN
THE SUN The Sun is actually a large star. Because the Sun is closer to us than any other star, it appears as a ball of orange, yellow, or white light in the sky. The Suns bright light prevents us from seeing any other stars in the sky, and is so bright, we would hurt our eyes if we looked at it directly. Like most stars, the Sun is a large mass of hydrogen and helium gases that constantly burn and re-generate, giving off heat energy and light. The Suns energy keeps us warm. Its light helps us see things around us, and helps our plants to grow.
The Sun is 860,000 miles wide, so about 109 Earths could fit inside the Sun! The Sun is about 93 Million Miles away from Earth. The Sun does not have any air or water, and is too hot for anything to live there. The Suns light takes 8 minutes to travel to Earth, at the speed of light which is 182,200 miles per second! (fortunately, its light is sent out constantly so we dont notice any delay) The Suns surface is rough, with flares, spikes, waves and storms happening all the time, and cooler areas known as sunspots appearing periodically. MORE FACTS ABOUT THE SUN About 93 Million Miles About 860,000 Miles Wide! (about 35 times wider than Earth)
REVIEW QUESTIONS! Please answer these questions which are based on the information we have covered about the SUN! 1.Other than the Sun, what are other things we can see in the night sky? 2.About how far is the Sun away from the Earth? 3.How long does it take the Earth to go around the Sun? 4.How much bigger is the Sun compared to the Earth? 5.What is the name of the closest star to Earth? 6.The Sun is part of a constellation. True or False ? 7.We would hurt our eyes if we looked directly at the Sun. True or False ? 8.The Suns surface is very smooth and consistent. True or False ? 9.All of our Solar Systems planets revolve around the Sun. True or False ? 10.Our Sun is the largest thing in the Universe. True or False ? 11.We could live on the Sun, but would need lots of ice to keep our ice cream from melting. True or False ? 12.Explain why the Sun is so important to us on Earth. 13.What are the names of the other planets in our Solar System? Which planet is closest to the Sun, and which planet is furthest? 14.Why can we have a warm day, without ever seeing the Sun shining?
NOW, LETS TALK ABOUT THE EARTH!
SOME FACTS ABOUT EARTH The Earth is shaped like a ball that is a little flat on the top and bottom (at the North and South Poles) The Earth was formed millions of years ago as very hot rock, metals and gases. The planet we call Earth has three parts: o The CRUST: Rains cooled the Earths hot exterior, and made it suitable for life. o The MANTLE: A middle layer of very hot rock -- when a volcano erupts, we see what the mantle is like o The CORE: The extremely hot molten center of the Earth The Earth has an atmosphere that includes: o Air for us to breathe (though there is less air the further you go away from the Earths surface) o Winds that move warm and cold air across the surface o Clouds that hold moisture above the surface, and deposit rain on the surface o Ozone that protects us from the radiation energy given off by the Sun.
MORE FACTS ABOUT EARTH Above the Earths atmosphere and out into space, there is ZERO gravity ; that is, there is no force to hold things down or prevent them from floating -- the Earth has gravity that keeps people and objects on the ground. The Earth is about 7,900 miles in diameter, and about 25,000 miles around (in circumference) at the Equator. Millions of years ago, the Earth was covered in ice, which eventually melted to form oceans, lakes and rivers. Many geologists believe that all the land we see on the Earth today, at one time had been attached – but the land broke apart and drifted to their current locations. The highest point on the Earths surface is Mount Everest, and the lowest points lie deep below our oceans.
We live on the EARTH, in Michigan, which is here North Pole South Pole This is the EQUATOR, which is an imaginary line at the middle of the EARTH. The equator is rather summer-like (WARM or HOT) all year-round. The NORTH POLE is at the topmost part of the EARTH, and the SOUTH POLE is at the bottom-most part. Both these places are winter-like (very COLD) all year-round. COLD WARM to HOT EARTH CLIMATE FACTS
Michigan is closer to the cold NORTH POLE than it is to the warm EQUATOR, so our temperatures tend to be much cooler than countries near the Equator. North Pole South Pole COLD WARM to HOT EARTH CLIMATE FACTS
Michigan can have cool days in the Summer and warm days in the Winter, because of the winds on the Earths surface that may blow warm Equator air or cool North Pole air towards us. North Pole WARM to HOT COLD WIND FROM THE NORTH WARM WIND FROM THE SOUTH EARTH CLIMATE FACTS
The Earth spins about an imaginary line called an AXIS that extends from the North Pole to the South Pole. The Earth spins one complete rotation (completely around) every 24 hours – which is ONCE EACH DAY. The Earth spins at a rate of about 1,000 miles per hour! …but like flying in an airplane, when everything moves at the same fast speed it seems like nothing is moving!! North Pole South Pole THE EARTHS ROTATION AXIS
THE EARTHS TILT: As you may have noticed in previous slides that the Earth is tilted relative to the path it takes around the Sun. The line from the North Pole to the South Pole is tilted at a small (but important) 23 degree angle. North Pole South Pole NOT LIKE THIS 23 o Orbit Path around the Sun THE EARTHS ROTATION
The Sun does not really move, so the Earths spin about its axis is what causes Day and Night to occur. The Sun rises in the Eastern sky and sets in the Western sky. Sunrise in the East (over the Atlantic Ocean) DAY AND NIGHT ON EARTH
The Earth travels in an orbit around the Sun. When drawn, the orbit path looks like an ellipse, and this is one REVOLUTION around the Sun. It takes 365 days and about 6 hours for the Earth to make one complete revolution around the Sun. This means that the Earth is moving around the Sun at a speed of about 66,600 miles per hour! THE EARTHS REVOLUTION AROUND THE SUN About 93 Million Miles
Since it takes 365 days and a few extra hours for the Earth to make one complete revolution around the Sun, we must account for these extra hours on our calendars… This is the reason for adding an extra day to our calendar every 4 years, called a Leap Year. Since February is a short month, we add 1 extra day (Feb 29 th ) to our calendars in February of a Leap Year (2012, 2016, etc. are Leap Years) THE EARTHS REVOLUTION AND LEAP YEAR About 93 Million Miles
The Earths orbit around the Sun and the tilt of our Earth are the reasons we: (1) experience four seasons in Michigan – Winter, Spring, Summer and Autumn (Fall), (2) why our temperatures change during these seasons, and (3) why we have a greater amount of daylight in the Summer than we have in Winter. WE WILL EXPLORE THIS IN THE NEXT FEW SLIDES!!! SEASONS and AMOUNT OF DAYLIGHT
In this position, it is WINTER in Michigan and the rest of the United States, with the SUNs rays coming to us at an angle and not warming us as much as the direct sunlight that the Equator, and the countries below the equator are getting. Note that in Australia, while we are experiencing Winter, they are having a nice warm Summer! THE WINTER POSITION OF EARTH
During Winter, we see the Sun in the southern part of the sky, because Michigan is tilted away from the Sun at this time of year. In this Winter position within our orbit around the Sun, the amount of daylight is at a minimum -- it gets dark at around 5pm. Note that many people say the days are getting shorter in Winter, but every day is still 24 hours long! – what they mean to say is that the daylight amount is getting shorter! THE WINTER POSITION OF EARTH
WINTER POSITION OF THE SUN IN OUR SKY In the Winter position of our Earths orbit around the Sun, the Earths tilt causes North America (including Michigan) to be tilted away from direct sunlight, so the Sun appears in the southern sky (closer to the southern horizon). Duncan Elementary School (A Blue Ribbon School!) Northern Sky Southern Sky
In this Spring orbit position, the Earths tilt is starting to give Michigan more direct sunlight, so we are starting to warm up! Spring is in the air and the amount of daylight is increasing by a few minutes each day! THE SPRING POSITION OF EARTH
Its SUMMER in the United States and North America! The Sun at the center of our solar system starts to appear directly overhead (straight up in the sky) at noon time. The people south of the Equator, such as in Australia and the South Pole, experience Winter at this time, when the Sun appears in their Northern sky. The Suns rays are approaching those southern areas at an angle so these areas are not as warm. THE SUMMER POSITION OF EARTH
SUMMER POSITION OF THE SUN IN OUR SKY In the Summer position of our Earths orbit around the Sun, the Earths tilt causes North America (including Michigan) to be tilted into direct sunlight, so the Sun appears directly overhead. Duncan Elementary School (A Blue Ribbon School!) Northern Sky Southern Sky
Here, its not only SUMMER for us in Michigan, but the day with the longest period of daylight, which is usually June 21 st. South of the Equator, they experience the shortest amount of daylight! THE SUMMER POSITION OF EARTH
The Earth is still rotating at the same 23 degree axis angle, but as its REVOLUTION around the Sun places it in this AUTUMN position, the amount of sunlight each day is slowly shrinking, and AUTUMN is coming! THE AUTUMN POSITION OF EARTH
In this position, AUTUMN is here in Michigan, and the temperature is starting to get chilly. South of the Equator, however, is experiencing springtime, as their temperatures are starting to increase and sunlight each day is getting longer. THE AUTUMN POSITION OF EARTH
SUMMARY: THE EARTH AND THE SEASONS In this picture, you see one full year, with a full revolution around the Sun. The Earth keeps the same tilt throughout, therefore causing the Suns energy to come to us more directly in Spring, more straight-on in the Summer, and at steeper angles in the Autumn and Winter.
SUMMARY: THE EARTH AND THE SEASONS This is an animation of the seasons occurring over one calendar year…
REVIEW QUESTIONS! Please answer these questions which are based on the information we have covered about the SUN! 1.Define Rotation, Revolution, Axis, and Orbit. 2.What is the Equator, and is it hot or cold there? 3.Where are the coldest places on Earth, (why are they so cold)? 4.How long does it take Earth to make one full rotation? 5.How long does it take Earth to make one full revolution around the Sun? 6.Explain why we have a Leap Year every 4 years? 7.What is the angle that the Earths axis is tilted? 8.What is the main reason why Michigan does not get as warm in the Winter (i.e., why the Sun is in the Southern sky) 9.What season do we get the MOST sunlight in a given day, and which season do we get the LEAST sunlight? 10.The Sun rises in the __________ and sets in the __________. 11.The Sun moves across our sky because Earth is rotating. True or False? 12.Name several of the things in Earths atmosphere. 13.Why it is possible to have a warm day in Winter or a cool day in Summer?
THE EARTH AND ITS MOON Many planets in our Solar System have more than one moon. The Earth has just one Moon. Our Moon is a sphere of rock formed millions of years ago that acts as a satellite orbiting the Earth as the Earth itself orbits around the Sun. Our Moon takes about 28 days (4 weeks) to travel around the Earth, but since the Earth makes a full rotation once each day, the Moon appears to move across our sky slowly during each night. The Moon is about 250,000 miles away from Earth.
THE MOONS PHASES Sometimes we see the Moon as a full round object in the sky (A Full Moon). However, at most times the Moons location relative to the Earth and Sun means that we see a only a portion of the Moon lighted and a portion (or all) of the Moon not lighted (covered in shadows). These different appearances are called PHASES OF THE MOON, as you can see here over a month span (May-June 2005):
THE MOONS ORBIT AND ITS PHASES The Moons phases have been given names – for example, Full Moon when the entire face of the Moon is illuminated for us to see on Earth, and New Moon when the back half of the Moon is illuminated and we can barely see the face of the Moon at all. First Quarter Moon Last Quarter Moon Full Moon New Moon
A FEW MORE OF THE MOONS PHASES Astronomers and scientists have given names to a few other Moon phases, as shown here (Waxing and Waning Crescent and Gibbous Moon Phases): Waxing Crescent (or just Crescent) Moon Waning Crescent (or just Crescent) Moon Waxing Gibbous (or just Gibbous) Moon Waning Gibbous (or just Gibbous) Moon
SUMMARY: THE MOONS PHASES This picture shows the positions of the Sun, Earth and Moon, and the different Moon Phases in these positions. SUN
EXPLORATION OF THE MOON Neil Armstrong and Edwin Buzz Aldrin of the Apollo 11 mission were the 1 st and 2 nd persons to walk on the Moon, on July 20, The Moon has no atmosphere, nor oxygen and no plant life, so the astronauts needed special suits with air tanks. The Moons surface has many large bowl-shaped pits called craters, probably from meteor hits. The Moons has a much lower amount of gravity so our astronauts could jump long distances, and felt much lighter than on Earth. In fact, on the Moon they weighed 1/6 of their weight on earth (their Earth weight divided by 6). Q: If you weigh 60 pounds on Earth, how much would you weigh on the Moon?
Total Eclipse of the Sun (Solar Eclipse) with extremely bright light showing around the Moon (DAMAGING TO THE HUMAN EYE!) SOLAR ECLIPSES Because of the way the Moon orbits around the Earth, the Moon sometimes moves into a position where it entirely (or partially) covers the Sun in the sky. This is called a TOTAL or PARTIAL Eclipse. Note that partial solar eclipses occur somewhere on Earth every 18 months or so. Total eclipses at any given location on Earth are rare – they only occur in Michigan every 410 years or so!
LUNAR ECLIPSES Occasionally, the Earth casts its shadow on the Moon during the day, thus causing the Moon to go from visible to shaded then back to visible again.
REVIEW QUESTIONS! Please answer these questions which are based on the information we have covered about the MOON! 1.The first person to walk on the Moon was Neil _______________. 2.The Moon is invisible (darkened completely) during the _________ phase. 3._______________ are bowl shaped pits found on the Moons surface. 4.The Moon is Earths natural ______________ because it orbits the Earth. 5.A person who weighs 120 pounds on Earth will weigh only _____________ pounds on the Moon. 6.When the Moon blocks our view of the Sun, it is called an ____________. 7.The Moon shines because of reflected light from the _____________. 8.When the Moon appears as a sliver of white, we call it a ____________ Moon. ADDITIONAL LUNAR QUESTIONS: Who was the 2 nd person to walk on the Moon? What was the name of the mission that sent the first astronauts to walk on the Moons surface, and what year did this mission take place? How many days does it take to see all the Moons phases? Also, draw a few of the Moons phases.
REVIEW QUESTION ANSWERS! 1.The first person to walk on the Moon was Neil Armstrong. 2.The Moon is invisible (darkened completely) during the New Moon phase. 3.Craters are bowl shaped pits found on the Moons surface. 4.The Moon is Earths natural satellite because it orbits the Earth. 5.A person who weighs 120 pounds on Earth will weigh only 120/6 = 20 pounds on the Moon. 6.When the Moon blocks our view of the Sun, it is called an eclipse. 7.The Moon shines because of reflected light from the Sun. 8.When the Moon appears as a sliver of white, we call it a Crescent Moon. ADDITIONAL LUNAR QUESTIONS: Who was the 2 nd person to walk on the Moon? (Buzz Aldrin) What was the name of the mission that sent the first astronauts to walk on the Moons surface, and what year did this mission take place? (Apollo 11, in 1969) How long does it take to see all the Moons phases? (about 28 days)
MORE REVIEW QUESTIONS! Please answer the questions presented here, which relate to the SUN, EARTH and MOON. Circle S for Sun, E for Earth and M for Moon (all that apply)! 1.Is basically round: S E M 2.Not suitable for human life: S E M 3.Rotates fully around once each day: S E M 4.Have different shapes called phases: S E M 5.Has an atmosphere and plant life: S E M 6.Has a mantle and a core: S E M 7.Is mainly made of the elements Hydrogen and Helium: S E M 8.Is the largest item in our Solar System: S E M
REVIEW QUESTION ANSWERS! 1.Is basically round: S E M 2.Not suitable for human life: S E M 3.Rotates fully around once each day: S E M 4.Have different shapes called phases: S E M 5.Has an atmosphere and plant life: S E M 6.Has a mantle and a core: S E M 7.Is mainly made of the elements Hydrogen and Helium: S E M 8.Is the largest item in our Solar System: S E M
SUN, EARTH, MOON CROSSWORD!
SUN, EARTH, MOON CROSSWORD CLUES ACROSS 1. Mars color 4. Phase showing most of the Moons surface 6. Planet between Venus and Mars 8. Collection of stars that looks like a thing 11. When we add a day to February 12. Earths nearest star 13. Aldrin or Toy Storys Lightyear 17. When the Moon blocks out the Sun 18. This circles Earth every 28 days 20.Lunar holes caused by meteor strikes 24.The Moon is a natural _______ of Earth 27.Planet between Earth and Saturn 28.Earth spins about this imaginary line extending from pole to pole 32. Apollo 11 moonwalker 33. One of earths poles 34. What keeps things from floating off – Moon has less of this than Earth! 36. Darkened Moon phase DOWN 1. Saturn has many of these around its surface 2. Star pattern, the Big ________ 3. Earth takes about 365 days for one or these 5. Planet near Neptune 7. Earth makes one full _______ each day 8. Sliver Moon phase 9. Circling around Earth or around the Sun 10. Protective layer in the Earths atmosphere 14. When the Earth casts a shadow on the Moon 15. NASA mission to the Moon 16. Planet too hot for living things 19. A planet between the Sun and Mars 21. Apollo 11 moonwalker 22. Planet near Jupiter, and former car brand 23. Lies below Earths crust (and above fireplace) 25. Lands on this imaginary line receive more direct sunlight than anywhere else 26.Earth has 23 degrees of this 29. The Sun rises here 30. Volcano output, evidence of Earths hot inner core 31. Needed to breathe, the Moon has none