The Sun

          The Sun is a yellow dwarf star, ___ (1). It is believed to be about 5 billion years old. The Sun spins slowly on its axis ____ (2). The center, or core, of the Sun is very hot. A process called «nuclear fusion» takes place there. Nuclear fusion produces a lot of energy. Some of this energy travels out into space ____ (3). Some of it arrives at the Earth! Streams of gas particles known ____ (4). On the Sun's surface, we can see storms. We call these storms «sunspots» ____ (5). The Sun also produces big explosions of energy called solar flares. These flares shoot fast ____ (6). These particles can hit the Earth's atmosphere and cause a glow called an Aurora.

A) as the solar wind also flow out from the Sun
B) moving particles off the Sun's surface
C) which means it is a medium size star
D) because they look like dark spots on the Sun's surface
E) as heat and light
F) as it revolves around the galaxy

​