The Sun is the Earth’s nearest star, about 150 millions km away. It is a medium-sized star, and belongs to a group of star types that astronomers call ‘main sequence’ stars. Most of these, including the Sun, will burn for about ten billion years before expanding and cooling to become red giants, ultimately using up all their fuel. The Sun is about halfway through its lifetime.
Sunspots
Astronomers viewing the Sun through special filters can detect dark spots coiled sunspots on the Suns surface. The sunspots are caused by changes to the magnetic field surrounding the Sun. As the Sun spins round, the magnetic field becomes tangled Sunspots develop in places where the magnetic force has became up to 3000 times stronger than normal. The Sun’s surface is cooler at these places, so the sunspots appear darker than the surrounding surface.
Tilting Earth
As the Earth tilts on its axis and spins around the Sun, the Sun Warms different parts of the planet. The Earth is the third planet out from the Sun, on overage 149.6 million km away. On 3 January. at the nearest point of its orbit (called the perihelion) the Earth is 147.097.800 km away from the Sun
On 4 July. at its furthest (the aphelion), it is 1 52,098.200 km away.
Amazing
The temperature at the Suns surface is 6000°C. Each centimeter of the Suns surface burns with the
brightness of 250.000 candles.
No comments:
Post a Comment