OBJECTS IN THE SKY Cectus Since ancient times people have tried to explain the things they could see in the sky Different cultures have seen different patterns in the stars They have named constellations after familiar animals everyday objects and story characters Ancient peoples also believed that angry gods threw lightning bolts from the heavens to punish humans on Earth Since these times scientists have learned much about what is really in the sky Pisces uariu A This illustration shows the constellation Orion named after the hunter in Greek
Constellations are among the many fascinating objects in the sky vy VN NY Orion Canis Minor Aurig When people think of objects in the sky they may think about planets the Sun So the Moon and the constellations Le Many other bodies orbit Earth and the Sun however Some of these bodies are natural Hydra Others are human made The sky in Earth's atmosphere holds many interesting objects as A well We may not need Major L a telescope to see them but they are no less dazzling Loo Mino Use r Daco Cygnus Bootes Hacules IT atmosphere is The the layer of gas that surrounds Earth 12
STARS Stars are glowing balls of gases They are grouped into galaxies The Milky Way galaxy alone contains hundreds of billions of stars Most stars are incredibly far away Nearly all stars are mostly made up of a gas called hydrogen A star's core is very hot Great pressure squeezes the core causing some of the hydrogen to change into another gas helium This process makes the star shine a Stars are found in large groups called galaxies Galaxies I can contain billions of
cloud of hydrogen and dust condenses helium core forms as hydrogen shell expands star finally collapses forming a white dwarf main phase star burns hydrogen in its core current state of Earth's sun star becomes a red giant consisting of a carbon core surrounded by a hydrogen envelope billions of years A medium sized star has a life span of billions of years Stars may be different in size temperature brightness and color After shining for billions of years a star uses up all of its THINK ABOUT ITN hydrogen Small and medium stars slowly cool down and stop The Sun is actually shining Large stars end with a star Its size and a violent explosion called a brightness are average What does Supernova this mean for the Sun's
