How far is a light-year? | Astronomy Essentials | EarthSky
Solar system: 9 light hours diameter. Spiral galaxy: 80,000 light years diameter. - ppt download
Solar system with three Earth sized planets discovered just 160 light years away
Seven Earth-sized Planets Found - Sciworthy
Kepler-62 and the Solar System | NASA
EarthSky | Proxima Centauri, closest star to our sun
Scientists think they just found the most important planet outside our solar system - Los Angeles Times
Milky Way galaxy: Facts about our cosmic neighborhood | Space
Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto Solar System Radius= light years An arrow where the tenth planet is and maybe how small. - ppt download
How big is the Solar System?
A close call of 0.8 light years : News Center
Astronomers find seven Earth-size planets orbiting 'nearby' star 40 light- years away | South China Morning Post
The Size and Scale of the Universe – Daniel's Astronomy Blog
Observable universe - Wikipedia
Kepler-186 and the Solar System | NASA
The 10 most Earth-like exoplanets | Space
New planet similar to Earth discovered: How far is 600 light years away? - The Washington Post
Solar System 2.0 Found 10 Light-Years Away
Another 8-Planet Solar System Discovered 2,500 Light Years Away - YouTube
2 Earth-size worlds revealed beyond our solar system | CNN
Diameter of the Solar System - Universe Today
Astronomical Unit compared to a Light-Year - YouTube
2 Earth-size worlds revealed beyond our solar system | CNN
Jupiter-like planet discovered outside our solar system | University of California
Two planets, including 'Super Earth,' discovered 120 light-years away
