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Dark Skies
Star Parties
Solar System
Light Pollution
<a href='/solarsystem/sun/index.html'>sun</a> Sun
mercury Mercury
venus Venus
earth Earth
mars Mars
jupiter Jupiter
saturn Saturn
uranus Uranus
neptune Neptune
pluto Pluto
Planet Stats
Planet Sizes
Planets & Stars
A Light Year
sunspot The sun is a mass of incandescent gas, a gigantic nuclear furnace. Where hydrogen is made into helium at temperatures of millions of degrees.
Spot Cycle
Diameter 1,390,000 km.
Temperature 5800 K (surface)
15,600,000 K (core)
Composition about 75% hydrogen and 25% helium
Age At least 4.5 billion years
Mean Distance 150,000,000 Km
Sun Facts
  1. The sun contains more than 99.8% of the total mass of the Solar System.
  2. When it comes to star size, the Sun is in the top 10% by mass. The Sun is much larger than red dwarfs which are the majority of stars in existence. On ther other hand Betelgeuse is 700 times larger than the sun. There are not many stars that large.
  3. Approximately one million Earths can fit inside the Sun.
  4. The Sun is about 75% hydrogen and 25% helium by mass. Everything else ("metals") amounts to only 0.1%
  5. The Sun is an active star that displays sunspots, solar flares, erupting permanencies, and coronal mass ejections.
  6. In addition to heat and light, the Sun also emits a low density stream of charged particles known as the solar wind.
  7. The Sun spins around once every 27.4 days.
  8. The Sun loses approximately 4 million tons every second, this is the amount of hydrogen gas that the Sun turns into energy.
  9. Solar PV generated power could provide 10,000 times more energy than the world currently uses.
  10. The number of sunspots and the levels of solar activity vary with an 11 year period known as the solar cycle.
The Sun is a typical G2 star. G stars are classified as having a temperature in the range of 5000 to 6000 K, and a color ranging from white to yellow. Spectrally, G stars show most predominantly the lines of ionized calcium. Lines from ionized and neutral metals are present. Lines from ionized hydrogen show up weakly.
Auroras, rainbows, sun dogs, green flashes, sun pillars, sunfish, sunflowers, glorious sunrises -- the Earth is full of wondrous references to the Sun, each inspired by the life-giving force from our special star.
Solar Observing tools
The sun spotter.
Mylar Solar Filters
Inconel Filters
Hydrogen-alpha Filters
Calcium K-line Filters
Energy Rejection Filters

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You can often find some of these sun observing tools at star parties.
When we measure stars, we compare them to our sun. Our sun has a solar mass of 1. A star with a solar mass of 2 has twice the mass of the sun.
Next: Solar Structure->
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