User:Alvations/astronomy facts

Facts
 * A light-year is about 10 trillion kilometers
 * It's about 4 light-years from here to Alpha Centauri
 * The Milky Way Galaxy is about 100,000 light-years in diameter
 * It will take the Voyager spacecraft about 20,000 years to travel just 1 light-year
 * Galaxies recycle heavy elements produced in stars into future generations of stars
 * there are no aurora on Venus because it lacks a strong magnetic field

Fiction
 * It will take me light-years to complete this examination
 * Without galaxies, the universe could not be expanding
 * Without galaxies, there could not have been a Big Bang
 * Galaxies Prevent planets from leaving their orbits around stars; e.g. our galaxy prevents the earth from leaving its orbits of the Sun
 * Galaxies provide the gravity that prevents us from falling off the earth
 * there is no auroras on Venus because it lacks atmospheric oxygen