Universe  Facts

• We live on the third planet from the sun at a distance of 8.3 light minutes(150 million kilometers or 93 million miles)

• There are about 250 billion stars in the Milky Way Galaxy.The Milky Way Galaxy is 100,000 light years side to side.
  

• Scientists believe the solar system began forming 10 to 12 billion years ago as swirling gas and dust formed a thick core. The core, with most of the mass, collapsed around 5 or 6 billion years ago and later became the sun. The remaining matter swirled into a disk. Some of it crashed together and formed planets. That's the main theory, at least, and though most scientists think that's how it happens, there are a few other explanations.
  

• The diameter of the bulge in the center is 30,000 light years.
  

• The thickness of the disk at the earth is 700 light years.
  

• The solar system orbits the center every 250 million years: a galactic year
  

• The galaxy is 13-15 billion years old
  

• The solar system is 4.6 billion years old.
  

• Alpha Proxima is our nearest neighboring star: 4.3 light years away. It's actually one of a three-star system that includes Alpha Centaur. Two stars tumble about each other and the third star orbits those two.
  

• How far is 4.3 light years? If you could travel really fast, say 100,000 kilometers per hour, it would take you 20,000 years to reach the closest star!
  

• How far is one billionth 4.3 light years? I wanted to include the nearest star in the Eugene Scale Model (scale one : one billion). I pictured traveling the world and placing a scale model star in some exotic foreign city. But Unfortunately the earth wasn't big enough. At a scale of one : one billionth 4 light years would be 37,869 kilometers away. The circumference of the earth is only 40,000 km. So the star would end up almost back in Eugene, only 2,131 kilometers (1,324 miles) away, but going the long way around 95% of the planet!
  

• The Milky Way is part of a cluster of about 30 other galaxies loosely held together by their mutual gravitational attraction. This is a small cluster, since some clusters contain thousands of galaxies.
  

• The largest galaxy in our group is called the Andromeda Spiral. A large spiral similar to the Milky Way. It is about 2.3 million light years from Earth and contains about 400 billion stars. The third spiral galaxy in our local group, M33, is the smallest of the spirals. It is close to the Andromeda Galaxy and is thought to orbit it.
  

• The closest known neighboring galaxies are the Magellanic Clouds, named after the famous explorer who first spotted them in 1521. In the 'clouds' are two irregular galaxies, one larger, the Large Magellanic Cloud, containing about10billion stars The other is smaller and farther away: the Small Magellanic Cloud. These two galaxies actually orbit the Milky Way Galaxy.
  

• Point the Hubble Space Telescope to a tiny seemly empty patch of sky and this is what it finds: thousands of distant galaxies, remnants of the Big Bang, receding into space.
  

• Gravity binds stars together into galaxies, binds galaxies into local groups of galaxies, groups of galaxies into clusters, and clusters into super clusters. The number of stars in the universe boggles the mind.

Cosmos...