The Sun has varying temperatures depending on the layer. Here is how hot the Sun's surface, core and corona are, plus how nuclear fusion works. $3,500 iPhone possible?

How far away it is: 93 million miles (150 million km) ...

Imagine a world without sunlight. No warm rays on your face, no vibrant colors, just an endless, frigid twilight. While it ...

Findings uncovered by the researchers, published in Nature Communications, confirmed there are five layers to the earth’s core and not four like has been historically thought.