Presentation on theme: "What are Stars and Planets?"— Presentation transcript:
1 What are Stars and Planets? UNIT D THE SOLAR SYSTEMWhat are Stars and Planets?
2 An astronomer is aperson who studiesthe universe.
3 THE NIGHT SKY Did you ever notice the sky on a clear night? There are many stars, too many of them to count.They look like small dots of light in the sky.They only look small because they are so far away.Stars are really much bigger than Earth.
5 STARSA star is a big ball of hot gases.The hot gases give off light. This light is whatwe see from Earth. They also give off heat.The sun is the closest star to Earth.Did you ever wonder why some stars are bigger and brighter than other stars?
6 The brightness of a star depends on their size, their heat, and their closeness to Earth.All stars are not the same sizes and temperatures.The bigger and hotter a star is, the brighter it will be.A stars closeness to Earth will also make it brighter.The closer a star is to Earth, the brighter it will be.
8 FACTS ABOUT THE SUN The sun is a star. It is the closest star to Earth.The sun is much larger than the Earth. It only looks smaller because it is so far away.Like other stars, the sun is made of hot gases.Because these gases are so hot, they give off light and heat.
9 Some people use a telescope to look at the night sky. A telescope makes stars look closer and larger.
10 CONSTELLATIONS A group of stars that form a star picture is called a constellation.Long ago, people saw pictures in these groups of stars.They began naming the different star pictures.There are about 88 constellations in the entire sky.
12 Big Bear and Big DipperThe Big Bear (Ursa Major) constellation contains a group of seven starscalled the Big Dipper.Together these stars form the shape of a dipper, a kind of spoon.
13 Polaris, or the North Star, can be found at the end of the handle of the Little Dipper.People long ago used it like a compassbecause it was so easy to spot, andalways leads you to the north.
14 Orion the Hunter…..Can you see the shoulders, belt with sword hanging, the bow, and his handpulling back the bow????
15 THE SOLAR SYSTEM The sun is the closest star to Earth. Eight planets, including Earth, move around the sun.A planet is a large ball of rock or gas that travels around the sun.Together, the sun, the planets, moons, comets, asteroids, andmeteoroids make up our solar system.The sun is the only star in our solar system.
16 OUR GALAXY Our galaxy is the Milky Way Galaxy. The Milky Way galaxy includes the entiresolar system and hundreds of billions of stars.
17 Mercury the planet closest to the sun. Small rocky and hot planetDusty surface with cratersLooks like Earth’s moon36 million miles from sun
18 Venus is second planet from the sun. Can be seen shining in thenight skyDry ,hot planet with tallmountains and deep valleyThick yellow clouds, blownaround by strong windsAbout the size of Earth67 million miles from sun
19 Earth, our planet, is the third planet from the sun. Almost cover by waterBall of rockNot too hot or too coldOnly planet with plants andanimals93 million miles from sun
20 Mars is the fourth planet from the sun. Desert, except for ice capsat each endTall mountains and deepcanyonsRed planet(soil full of rust)Strong winds blow up reddust141 million miles from sun
21 Jupiter is the fifth planet from the sun. Biggest planetBall of gas, rocky centerYellow, tan, red, orange,and white clouds blown bystrong windsGiant red spot, scientiststhink it’s a storm)483 million miles from sun
22 Saturn is the sixth planet from the sun. Ball of colored gasRocky centerPretty rings made of bits ofice and rock885 million miles from sun
23 Uranus is the seventh planet from the sun. Gas planet, rocky centerThin, dark ringsBlue-green colorCovered by thick hazeTilted on side, moves aroundthe sun like a rolling ball1billion 779 million milesfrom sun
24 Neptune is the eighth planet from the sun. Gas planetCenter of rock and ironGreenish colorCover with clouds2 billion 788 million milesfrom sun
25 What about Pluto? After it’s discovery in 1930, Pluto was considered the ninth planet in the solar system.From 1930 until 2006, we hadlimited information about Pluto.We did not gain a realistic understandingof it’s characteristics until 2006.In 2006, Pluto was classified as the2nd largest known dwarf planet.There are just 5 known dwarf planets atthis time. But, scientists know there aremany more to be discovered.
26 MeteoroidsMeteoroids are made of smallchunks of rock and ice.
27 AsteroidsAsteroids are chunks of rockand metal.