1、All? living? things? need? light? and? heat? from? the? sun? to? live. ? All living things depend on the light and heat of the sun to survive.
2、Light? and? radiant? heat? both? travel? through? a? vacuum,? otherwise? the? sun's? light? and? heat? would? not? reach? us. ? Both light and radiant heat can pass through a vacuum, otherwise the light and heat of the sun will not reach us.
3、A? very? small? fraction? of? the? sun's? light? and? heat? is? emitted? in? such? directions? that? after? passing? unhindered? through? interplanetary? space,? it? hits? the? Earth. Only a tiny part of the light and heat emitted by the sun passes through cross star space and then reaches the earth.
4、The? output? of? light? and? heat? of? the? Sun? requires? that? some? 600? million? tons? of? hydrogen? be? converted? into? helium? in? the? Sun? every? The light and heat generated by the sun need to convert 600 million tons of hydrogen into helium every second.
5、The? energy? of? the? sun? comes? to? the? earth? mainly? as? light? and? Heat. The energy of the sun is transmitted to the earth in the form of light and heat.