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- Sun - Wikipedia
The Sun is the star at the centre of the Solar System It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies
- Sun: Facts - NASA Science
Without the Sun’s energy, life as we know it could not exist on our home planet The temperature in the Sun's core is about 27 million degrees Fahrenheit (15 million degrees Celsius) – hot enough to sustain nuclear fusion This creates outward pressure that supports the star's gigantic mass, keeping it from collapsing
- How the Sun Works - HowStuffWorks
But it’s a real marvel: The sun warms our planet every day, provides the light by which we see and is necessary for life on Earth It can also cause cell death and make us blind It could fit 1 3 million Earths inside its sphere [source: SpaceDaily]
- In Depth | Sun – NASA Solar System Exploration
Without the Sun’s energy, life as we know it could not exist on our home planet From our vantage point on Earth, the Sun may appear like an unchanging source of light and heat in the sky But the Sun is a dynamic star, constantly changing and sending energy out into space
- The Sun: Facts, size, and fate of Earth’s blazing star
Gazing up at the clear blue sky, our eyes are often drawn to the Sun, that magnificent burning orb that illuminates our days, warms our planet, and supports the growth of our food But how much
- All About the Sun | NASA Space Place – NASA Science for Kids
Our Sun is about 100 times wider than Earth, but it is just an average sized star Astronomers have found some stars that are 100 times bigger than the Sun and others that are 10 times smaller The Sun is also right in the middle of its lifecycle Right now, our Sun is in a stage called yellow dwarf It is about 4 5 billion years old
- The Sun, our Solar System’s star | The Planetary Society
We study the Sun to learn about how stars work, and to help protect our civilization from solar storms Where did the Sun come from? The Sun formed 4 6 billion years ago from a gigantic collapsing cloud of gas and dust called the solar nebula
- Meet the Sun - Center for Science Education
Earth and all other objects in our solar system orbit around the Sun due to gravity – the Sun contains over 98% of all mass in the solar system and so exerts a strong gravitational pull Like other stars, the Sun is a dense ball of gas that creates energy through nuclear fusion reactions in the core, creating helium atoms from hydrogen atoms
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