Gravitational Effects

• 8C20.10 - Klein Bottle
• 8C20.20 - Moebius Strip
• 8C20.30 - Saddle Shape
• 8C20.35 - Non-Euclidean Geometry
• 8C20.40 - Gravitational Lens
• 8C20.50 - Cosmic Web, Gravitational Waves - LIGO
• 8C20.53 - Gravity Sandbox
• 8C20.55 - Gravitational Waves - Spiraling Black Holes
• 8C20.60 - Quasars
• 8C20.70 - Cosmic Strings
• 8C20.80 - Dark Matter
• 8C20.90 - Dark Energy