Super Massive Black Holes by PHD Comics. Sagittarius A*, the super massive black hole at the center of the Milky Way, has a mass million times the mass of our sun, and a diameter equal to the distance between the sun and Mercury.
Voyager 1 spacecraft's biggest moments are shown in this chart covering the last 36 years. Voyager 1 is almost 12 billion miles away now! and moving at miles per hour!Voyager 1 will be the first ever object we've sent outside our solar system.