• Introduction
• Supernova Explosions
• The Equivalence Principle
• The Speed of Light
  • Why Can Nothing Travel Faster than the Speed of Light?
• Lesson 11: Evaporating Black Holes
  • Checking up on Einstein
  • Could some Black Holes be Primordial?
  • Hawking Radiation
  • Hawking’s “Area Theorem”
• Types of Spectra
  • SELF-CHECK: Types of Spectra
• The Rubber Sheet Analogy for Spacetime
• Accretion
• Relativity
• Lesson 6: Stars and Their Fates
  • Neutron Stars
• Black Holes that Formed in the Early Universe
• Astro 130
• Types of Active Nuclei Galaxies
• How Does Gravity Keep Objects in Orbit?
• Introduction
• What are MASERs?
• Introduction
• Back to Falling into a Black Hole
• Superluminal Motion in Quasar Jets: an Optical Illusion
• Examples of Lensed Objects in the Universe
• Does a Black Hole have a Surface?
• Testing Gravitational Lensing
• Lesson 1: Introduction to Black Holes
  • SELF-CHECK: Journey into a Black Hole
• Introduction
• Content page
• Lesson 7: X-ray Binary Star Systems
  • Converting Mass to Energy with a Black Hole
  • Summary on Methods for Finding Stellar-Mass Black Holes
• Lesson 2: Light, Spectra and the Doppler Effect
  • How Spectra are Formed
  • The Doppler Effect
• Content page
• Time Dilation
• Content page
• Falling into a black hole
• What are MASERs?
• Summary Questions
• Key Ideas of Special Relativity
  • Length Contraction
  • Mass Increase
  • Simultaneity of Events
  • The Twin Paradox
• Gravitational Time Dilation
• Are Black Holes Fussy Eaters?
• Course Navigation
• Lesson 12: Schwarzschild Radius and Tides
  • Physical Properties and Types of Black Holes
  • Schwarzschild Radius
  • Singularity
  • Tides
• Escape Velocity and the Definition of a Black Hole
• Gravitational Waves as a Test of General Relativity
• Lesson 3: Newton's and Einstein's Theories of Gravity (Escape Velocity, Spacetime)
  • Weightlessness
  • Spacetime
• The Effect of Gravity on Light
• How do Supermassive Black Holes in Centers of Galaxies Form?
• Summary
• Is Spacetime Moving Faster than the Speed of Light Near a Black Hole?
• Observational Evidence of Special Relativity
• Lesson 11
• Summary
• Lesson 13: Falling Into a Black Hole and Wormholes
  • What is Inside a Singularity?
  • Wormholes
  • The First Image of a Black Hole
• Summary
• Lesson 8: Quasars and Kin
• Orientation
  • Introduction
• Gravitational Redshift
• Black Holes and their Host Galaxies
• Lesson 9: Jets
• Lesson 4: Special Theory of Relativity
• Unit 1: Spacetime, Special and General Relativity
  • Lesson 5: General Theory of Relativity
    • Gravitational Lensing
    • Observational Evidence of General Relativity
• Unit 2: Types of Black Holes and their Characteristics
  • Lesson 10: Black Holes in Hibernation
• Unit 3: Evaporation of Black Holes, Wormholes, and Time Travel