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Bookmark or Share- Hubble Skymap - NASA ScienceThe Hubble Skymap puts the night sky at your fingertips any time of day. Roam the Milky Way to find a selection of galaxies, stars, nebulae and more, and click for a Hubble's-eye-view of each object.
- Solar System Exploration - NASA ScienceOur solar system has one star, eight planets, five officially named dwarf planets, hundreds of moons, thousands of comets, and more than a million asteroids.
- Star Types - Science@NASAScientists 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.
- Stars - NASA ScienceAstronomers estimate that the universe could contain up to one septillion stars – that’s a one followed by 24 zeros. Our Milky Way alone contains more than 100 billion, including our most well-studied star, the Sun. Stars are giant balls of hot gas – mostly hydrogen, with some helium and small amounts of other elements.
- Multiple Star Systems - Science@NASAThese 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.
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