Science notes Unit 6a Page 1

• Light travels in a straight line
• Natural sources of light include the Sun, stars, glow-worms, fireflies, some microorganisms, fire, lava, and lightning
• The Sun is the main source of natural light
• Non-luminous things include the Moon, planets, glass, and shiny surfaces that reflect light but are not luminous themselves
• Artificial light is man-made and sources include lamps, torches, and candles
• Luminous objects like the Sun and stars give out light, while non-luminous objects like the Moon reflect light
• Shiny surfaces reflect light better than dull surfaces
• Transparent, opaque, and translucent objects can be identified and differentiated in their surroundings
• Shadows are formed when light is blocked by an object, and their location, size, and shape can be predicted relative to the light source and object positions