Are we alone??? Watch The Universe how it works.

1. yellow earth suns are only 10% of all stars made. 80% are red Dwarfs 10% giants. Giants have too short a life, it measured in millions not Billions. Red dwarfs are small but in the first halve of their lives the have Gigantic Magnetic storms that would blow away any atmospheres and the planets around them are all tidally locked, no live of those suckers.
2. the moon is SO important to life on earth for a variety of reasons that most planetary scientists say if there's no moon don't bother looking. its estimated that only 1 out of 10 planets of earth size has a moon. and on and on...... Lastly of all the thousands of systems so far we are the only system with a mix of Earth like planets close in and Giant Gas planets farther out. all the others, have close rocky Planets or big Gaseous Planets.
   No, I don't believe in Lizard people. the "consider the size of the Universe" is a red herring. the average temp of the Milky way if you include stars and the empty space 4 deg Kelvin. That's cold, but there are hot spots with galaxies were the avg temp is 300 million degrees. There are lots of places where the temp is to hot for life no matter how many stars are there.