It is impossible to say with certainty how many stars there are in the universe, as we can only see a small fraction of them. However, scientists estimate that there are between 100 quintillion and 100 septillion stars in the universe. That's a number so large that it's hard to even comprehend!
Our galaxy, the Milky Way, contains an estimated 100 billion stars. The Milky Way is just one of billions of galaxies in the observable universe, and each of those galaxies contains billions of stars.
So, are we alone in the universe? Based on the sheer number of stars and planets out there, it seems unlikely that we are the only life-forms in the universe. However, we have yet to find any definitive evidence of extraterrestrial life.
There are a number of ongoing searches for extraterrestrial life, including the SETI (Search for Extraterrestrial Intelligence) program. SETI uses radio telescopes to search for signals from other civilizations. So far, SETI has not found any conclusive evidence of extraterrestrial life, but the search continues.
Even if we are alone in our galaxy, there are billions of other galaxies out there, so the possibility of life somewhere else in the universe is still very real. It is only a matter of time before we find out for sure.
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