133 Days on the sun

: The Sun is a 4.5 billion-year-old yellow dwarf star - a hot glowing ball of hydrogen and helium - at the center of our solar system. It's about 93 million miles (150 million kilometers) from Earth and it's our solar system's only star. Without the Sun's energy, life as we know it could not exist on our home planet.

Curious about the Sun, Galileo used his telescope to learn more. Not knowing that looking at our very own star would damage his eyesight, Galileo pointed his telescope towards the Sun.

: It's kind of impossible to say when the Sun was discovered, since the first life forms on Earth probably relied on its energy.

Humans have been well aware of the Sun for tens of thousands of years, and before modern astronomy had no idea what it was.

*Question*: How do astronomers describe our sun?
*Answer*: Astronomers, however, call the sun a yellow dwarf star because its colors fall within the yellow-green section of the electromagnetic spectrum. The sun, although it has sustained all life on our planet, will not shine forever. The sun has already existed for about 4.5 billion years.