Star Types - Science@NASA Scientists call a star that is fusing hydrogen to helium in its core a main sequence star Main sequence stars make up around 90% of the universe’s stellar population They range in luminosity, color, and size – from a tenth to 200 times the Sun’s mass – and live for millions to billions of years
The Lives, Times, and Deaths of Stars - NASA Science These and planetary nebulae from low-mass stars are the sources of many of the elements we find on Earth Their dust and gas will one day become a part of other stars, starting the whole process over again That’s a very brief summary of the lives, times, and deaths of stars
Star Lifecycle - Science@NASA Groups of stars make up galaxies, while planets and ultimately life arise around stars Although stars have been the main topic of astronomy for thousands of years, we have begun to understand them in detail only in recent times through the advent of powerful telescopes and computers
Hubble Snapshot Captures Life Cycle of Stars - Science@NASA This picture nicely illustrates the entire stellar life cycle of stars, starting with the Bok globules and giant gaseous pillars (evidence of embryonic stars), followed by circumstellar disks around young stars, and progressing to aging, massive stars in a young starburst cluster
Multiple Star Systems - Science@NASA These multiple star systems come in a stunning variety of flavors: large, hot stars orbited by smaller, cooler ones; double stars orbited by planets; pairs pulsing with X-rays as one sheds material that is devoured by the other; systems with as many as seven stars in a complex gravitational dance
Other Stars, - Science@NASA As we look around the galaxy, how different is our solar system from other systems in the Milky Way? How much are we alike? This five-part series looks at some of our intriguing galactic neighbors — these other worlds, and the stars that they orbit
Hubble Focus: The Lives of Stars - Science@NASA Hubble has spotted countless stars roaming the galaxy alone or in pairs, but sometimes huge groups of stars are born in a giant litter of dozens to a million stars held together by gravity By studying these star clusters, Hubble offers us new insight into stellar and even galactic evolution
Solar System Exploration - Science@NASA The solar system has one star, eight planets, five dwarf planets, at least 290 moons, more than 1 3 million asteroids, and about 3,900 comets
Hubbles Nebulae - Science@NASA The Orion Nebula is home to a star cluster defined by four massive stars known as the Trapezium These stars are only a few hundred thousand years old, about 15-30 times the mass of our Sun, and so hot and bright that they're responsible for illuminating the entire Orion Nebula
The Life of Stars - NASA Science This single view nicely illustrates the entire stellar life cycle of stars, starting with the Bok globules and giant gaseous pillars, followed by circumstellar disks, and progressing to evolved massive stars in the young starburst cluster