Stars and Constellations

• Star


  A natural luminous body visible in the sky especially at night
• There are approximately 400B stars and 170M of galaxies
• A sun is a star
• The Sun is only about 150M km away and it takes only 8 mins and 20 seconds for sunlight to reach our world
• Star


  • A huge sphere of a very hot glowing gas
  • Stars are the most widely recognized astronomical objects
  • It represents the most fundamental building blocks of galaxies
• Brightness


  • A large star shines brighter than a small star
  • A hot star shines brighter than a cool star
  • A star's apparent brightness is the brightness you see from the earth
  • A hot large star that is very far away from the earth does not look very bright
  • A star's absolute brightness is the brightness the star would have if all stars were the same distance from Earth
• Color and Temperature


  • Star color ranges from red to blue
  • The color of the star indicates its surface temperature
• Scientists believe that all stars came from huge clouds of gas and dust called nebulae
• The brightness of a star is observed from earth relies upon two variables: Distance and Absolute brightness
• More massive a star is, the hotter its surface
• Constellation


  Many of these constellations have names that can be traced back to early Babylonians and Greek civilizations
• During summer in the Philippines the constellations of Orion and Taurus are not visible at night
• The revolution is responsible for the fact that we can see different parts of the sky at different parts of the year
• There are 88 constellations recognized by the international astronomy union (IAU)
• Some constellations appear and disappear in the night sky throughout the year to the revolution of the earth
• The constellation appears to move across the night sky from east to west
• the sun is color yellow and has a 5700 degrees Celsius
• Proxima Centauri is color red and has a 2300 degrees Celsius
• Epsilon Iridami is color orange and has a 4600 degrees Celsius
• Vega is color white and has a 9900 degrees Celsius
• Sirius is color white and has a 10000 degrees Celsius
• Alnilam is color blue and has a 27000 degrees Celsius
• white dwarf is the same size as the earth
• stellar nebula is where the stars came from
• life cycle of a star

  Stellar Nebula - Average star>Red Giant>Planetary Nebula>White dwarf

  - Massive Star>Red Super Giant>Supernova>Neutron Star

  >Black Hole