1 lighting means using light to make things visible
2 light is a type of energy called electromagnetic radiation
3 it travels in waves and doesn’t need air to move
4 light moves extremely fast — about 300,000 km per second in space
5 there are two main sources of light: natural and artificial
6 natural light comes from the sun, stars, and fire
7 artificial light comes from man-made things like bulbs or LEDs
8 we see objects when light reflects off them into our eyes
9 lighting is used in homes, schools, offices, and outdoors
10 ambient lighting gives general brightness to a space
11 task lighting helps with focused work like studying or cooking
12 accent lighting is used to highlight or decorate certain areas
13 too much light can cause glare and be uncomfortable
14 too little light can make it hard to see and cause eye strain
15 proper lighting improves visibility, comfort, and safety
My note
i learned that lighting comes when its raining and also light is really fast about 300,000km per second
in space
Light travels at a very high speed—about 300,000 kilometers per second—but it’s not instant. The Sun is around 150 million kilometers away from Earth, so when light leaves the Sun, it takes about 8 minutes and 20 seconds to reach us. That means if the Sun were to suddenly disappear, we wouldn’t know for 8 minutes and 20 seconds. We would still see the sunlight and feel its gravity during that time.
This delay tells us a few important things:
Light is fast, but it takes time to travel.
Nothing in the universe can travel faster than light.
When you see something far away, you’re seeing it as it was in the past. For example, the Sun as it was 8 minutes ago, or stars as they were years ago.
Space and time are connected. The farther away something is, the further back in time you’re seeing it. This is the basis of the idea of spacetime.