There are Countless stars in our galaxy, the Milky Way. This picture is from Skyrim Galaxy – Milky Way by Kriminalrus and may be seen at http://www.nexusmods.com/skyrim/mods/15707/?

By some estimates, there are between 100,000,000,000 to 400,000,000,000 stars in the Milky Way. That is 100-400 billion. The operative word in the last sentence is “estimates”. Our sun is one small yellow star in one arm of this huge conglomeration of stars, gas, and dust. The galaxy is so big that it takes over 100,000 years for light to travel across the diameter. That is 100,000 years of travel at 300,000 kilometers per second.

Now, consider that our galaxy is one of billions of galaxies in the universe. Imagine the number of worlds that could exist in the universe that support intelligent life. The numbers are staggering.