Actually, the universe is made up of galaxies, of which, they are made up of stars, planets, asteroids, meteors, huge big-ass gas clouds that can be zillions of miles across and Tottenham supporters....
On average, there are hundreds of billoins of stars in a galaxy and there are hundreds of billions of galaxies; our star system has 9 planets whizzing around it, just think of the possible number of planets in the universe (after those number of stars and galaxies I have just mentioned) and it is statistically impossible for us to be the only living inhabitants ...well, as close to impossible as you can get.
I don't think these threads are gonna be enhanced by any Google experts because they can be spotted a mile off and so please refrain from cutting and pasting Wikipedia extracts .......but there is one thing I found quite fascinating because classical opinions had the rate of expansion of the universe decreasing but, it was found to be increasing ......if so, WTF is causing that acceleration into oblivion ...food for thought maybe?