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CRCT Question

CRCT Question. Groups of two or more stars are called: Star clusters Star systems Galaxies Solar systems . When’s The Test? . Are stars still present in the sky during the day time ?.

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CRCT Question

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  1. CRCT Question Groups of two or more stars are called: Star clusters Star systems Galaxies Solar systems

  2. When’s The Test?

  3. Are stars still present in the sky during the day time? • Yes, we just can’t see them because their dim light is overwhelmed by the brightness of the sun during the day.

  4. 0 Galaxies are based on their: • Size • Shape • Brightness • Density What is it most based on?

  5. Life of a Star

  6. Nebula: A large cloud of gas (helium and hydrogen) and dust which forms into a star. Dust and gas particles exert a gravitational force on each other which keeps pulling them closer together. Orion Nebula 1. The Origin of Stars

  7. As the particles pull closer together the temperature increases. At 10,000,000o C fusion takes place and energy radiates outward through the condensing ball of gas. Another view of Orion More Nebulas

  8. Hydrogen Fusion: Energy of the Stars • Stars have large amounts of hydrogen gas. • Four hydrogen atoms fuse forming 1 atom of helium • The mass of 4 hydrogen atoms is greater than the mass of 1 helium atom; the excess mass is converted to a tremendous amount of energy.

  9. This hydrogen  helium fusion can power a star for billions of years

  10. Fusion uses up a star’s hydrogen supply rapidly casing the core to heat up and the outer temperature to fall. (Life cycle of the star) Star expands and becomes a red giant Red Giant Step 2: Stellar Evolution

  11. Core continues to heat and star expands to a super giant. As the core uses up its helium supply, the outer layers escape into space and the remaining core is white hot and called a white dwarf. White dwarfs Stellar Evolution

  12. When no more material is left in the core it explodes into a supernova. Smaller stars become neutron stars and most massive will collapse into a black hole. Neutron Star 3. More Stellar Evolution

  13. Black Holes-nothing can escape, even light!

  14. Galaxy: A large group of stars, gas, and dust held together by gravity. Milky Way: Our galaxy which contains about 200 billion stars and many nebulas Spiral Galaxies A. Earth’s Galaxy—and Others

  15. Spiral Galaxies: Circular galaxies that have arms curve outward from a central hub. Arms are made up of stars and dust Two spiral galaxies!! Spiral Galaxies

  16. Irregular Galaxies: Come in many different shapes and are smaller and less common than elliptical or spiral galaxies. Irregular Galaxies

  17. Do you know the Milky Way? • 100,000 light years in diameter • Our sun orbits the center of the galaxy once every 240 million years • Probably a barred spiral galaxy • Contains over 200 billion stars • Its where I live!!!!!

  18. Name Game

  19. Constellation Homework Need to include: • Picture • Major stars • Brief background

  20. Stars as Tools for Navigation • Earth rotates on its axis, this makes most constellations appear to rise in the east and set in the west during the night. • Most constellations appear in many different positions in the sky as the Earth revolves around the sun. • There is a group of stars that appear in the sky all night long and all year long. It seems that these stars do not rise and set, but circle the Earth’s north pole each night. These stars are called circumpolar.

  21. Stars As Calendars • It seems that the constellations in the east rise a little earlier each evening. This means that the seasons are changing and we are seeing different constellations. • An example is in the Northern Hemisphere, Orion is high in the sky during the winter and Scorpio can only be seen during the summer. • People of ancient times used these seasonal changes in the stars as calendars. • It is believed that the ancient people used the constellations to tell them when to plant and harvest crops. An example would be Leo and Virgo in the night sky would signify that the last frosts of the year have happened and it is safe to plant. This worked much like our paper calendars work for us today.

  22. Interesting Facts The brightest constellation is Crux (the Southern Cross). The constellation with the greatest number of visible stars in it is Centaurus (the Centaur - with 101 stars). The largest constellation is Hydra (The Water Snake) which extends over 3.158% of the sky.

  23. Orion When the gods were tired of him, the sent a scorpion to bite and kill him. Orion is one of the brightest constellations and is a mythological character. According to Greek myths, Orion was a hunter who used to brag all the time. This bother the gods. The gods felt bad for doing having Orion killed, they they placed him in the sky.

  24. Constellation List • Andromeda • Canis Major-the dog • The swan • Gemini-the twins • Leo-the lion • Orion-the hunter • Scorpius-the scorpion • Taurus-the bull • Big dipper • Little dipper

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