Earth's solar system has only one sun, but if the word "sun" is taken to mean "any star with planets in orbit," the Milky Way might have as many as 400 billion suns. If the observed ratio of approximately one planet per star is consistent everywhere, the observable universe might contain 10^24, or 1 septillion, suns.
The sun of Earth's solar system is large when compared with other planet-supporting stars. Of the 50 stars within 17 light-years of the solar system, the sun is the fourth most massive. The majority of stars that last long enough to support the formation of planets are classified as red dwarfs. These stars are smaller and less massive than the sun, they burn through their smaller complements of hydrogen fuel more slowly, and they shine much longer than stars like the sun.
Very large stars, such as the blue giants, tend not to support planetary systems. These stars' high mass drives accelerated fusion reactions in their cores and exhausts their entire complement of hydrogen on a scale of tens of millions of years as compared to billions of years for stars like the sun, which might not allow time for planetary systems to form. However red dwarfs could potentially endure for trillions of years and form full planetary systems.Learn More
The star that shares the solar system with the Earth is the Sun. It is the star around which all the planets in the system revolve. According to About.com, the Sun weighs almost 99.86 percent of the total mass in the solar system.Full Answer >
When a ring appears in the sky around the sun, it is called a halo. Halos have also been observed around the moon in the night sky.Full Answer >
The time it takes to orbit the Sun depends on the planet. Because of gravity, the mass of the planet and other considerations, objects closer to the Sun tend to have a faster orbit. Earth, the third planet from the Sun, takes 365.26 days to orbit the Sun.Full Answer >
According to CNN, a solar eclipse is only a total eclipse for those areas of the Earth directly beneath the moon's shadow. Since the moon is much smaller than the sun or the Earth, it may only completely block the sun's light over part of the Earth's surface. Anyone outside this full shadow may see a partial eclipse, but it will not achieve totality.Full Answer >