What are the different stages of the life cycle of a star?

What kind of gas is in space that can't let us breath in space? Why is the earth next to the sun? Which of the thinkers from the scientific revolution first proposed a heliocentric theory that Earth revolves around the sun? What do the sun and a light bulb have in common? How many Apollo flights was there? Does the human body have to decompress after reentry into Earth from space? What was the first American space exploration? Is Neptune one of the largest or smallest or middlest planet? What are the chances of Halley's Comet being in the sky on the night of a lunar eclipse? Do tornadoes move toward the columns in the northern hemisphere? How fast does a space shuttle go per second? What are three theories that have changed due to new evidence? What are the pros and cons of Albert Einstein's discoveries? Suppose there are two stars A and B with the same luminosity. If star A is larger then star B then we can conclude that? When does the big dipper burn out? Why are aurora natural source of light? How could argon be removed from the atmosphere? What would happen to the global climate if there were a dramatic decrease in greenhouse gases trapped in the atmosphere? Why is the temperature on the surface of Jupiter much lower than that on earth? Why cant a person see the big dipper in Australia?

What are the different stages of the life cycle of a star?