Red giants are much bigger than the Sun, and they have a relatively low surface temperature which is responsible for their red colour. This is a continuous stream of matter and radiation that comes from the Sun. When a comet approaches the Sun, the effects of the solar wind can be seen as it blows the comet's tail. Star Stars are massive hot balls of fire, with nuclear reactions in their cores giving out immense amounts of heat and light energy. There are many different kinds of star and they range in temperature, size and age.
Hot stars look blue, and cool stars look red.
Low mass stars evolve into red giants , and ultimately become white dwarfs and nebulae our Sun will suffer a similar fate. High mass stars, on the other hand, die spectacularly when their cores collapse under their own gravity, creating a massive supernova explosion. What s left behind is either a neutron star or a black hole . In fact, most of the elements in the periodic table are produced by supernova explosions, and they are only around today because of supernova explosions in the early universe. This is the apparent shift in the position of a star if it is viewed from the Earth at different times throughout the year.