ORIGIN OF THE UZARA

• What is the term used to describe everything that exists in any place, including space, matter, and energy?

  The universe
• What does the Big Bang Theory explain?

  The formation of the universe
• How long ago did the Big Bang occur?

  About 10-15 billion years ago
• What happened to energy and matter at the time of the Big Bang?

  They were concentrated in a small area that started expanding
• What did the expanding, cooling universe first form?

  Subatomic particles and small atoms of hydrogen and helium
• What occurred after about a billion years following the Big Bang?

  Matter clumped together forming stars and early galaxies
• What is the evidence for the Big Bang Theory related to cosmic background radiation?

  Longwave background radiation coming from all directions in the universe
• What is the significance of the cosmic background radiation?

  It supports the Big Bang Theory
• What does the Doppler Effect describe in the context of stars?

  The apparent shift in wavelength of electromagnetic radiation due to the motion of the object emitting it
• What happens to the light from stars in galaxies as the universe expands?

  It is shifted to the red end of the spectrum
• What does a red Doppler shift indicate about an object's motion?

  The object is moving away from the Earth
• What does a blue Doppler shift indicate about an object's motion?

  The object is moving toward the Earth
• How does the distance of a galaxy from Earth relate to its red shift?

  The farther away a galaxy is, the greater the red shift
• What is a galaxy?

  A collection of billions of stars and various amounts of gas and dust held together by gravity
• How many galaxies are estimated to exist in the universe?

  Over 100 billion galaxies
• What are the three classifications of galaxies based on their shape?

  • Elliptical
  • Irregular
  • Spiral
• What galaxy is our solar system a part of?

  The Milky Way Galaxy
• What shape is the Milky Way Galaxy?

  Spiral
• EVIDENCE FOR THE BIG BANG THEORY

  1)Cosmic Background Radiation

  2)Doppler Effect /Red Shift
• This radiation can be observed by the

  spectrum of a star (ROYGBIV)
• SPIRAL GALAXY

  A) APPROX POSITION

  B) CENTRAL BULGE

  C) NUCLEUS