Astronomers have found a lot of evidence that says that the Universe that we know today started about 13.7 thousand million years ago in a so-called Big Bang, and that the Universe has gotten ever larger and colder since that time.
When the Big Bang came the whole Universe was squeezed together in a very small space, that was very dense and hot. It wasn't that all matter and energy was squeezed together and the rest of space was empty, but that there was so little space that all matter and energy only fit if it were pressed together incredibly tightly everywhere.
Scientists don't know for certain what, if anything, came before the Big Bang. It was so mindbogglingly hot and dense just after the Big Bang that anything you can find in the Universe today or that we've been able to do in our laboratories is like a freezing vacuum of space by comparison. If you were to be transported back in time to that period, then you'd instantly be vaporized so thoroughly that not even a single atom from your body would stay intact. Because we haven't been able to study anything like the conditions that existed then, we can't be sure that the laws of physics that we've discovered so far in our current, old Universe were important in the first instants after the Big Bang, or before the Big Bang (if there was anything then).
We can imagine that there may have been stars and galaxies before the Big Bang, but it seems impossible that we could ever find proof of this. If there was something before the Big Bang, then it would have been crushed and vaporized beyond any recognition during the Big Bang. We may as well consider the Big Bang to be the beginning of time, because no information from earlier times could have gotten to us through the Big Bang (if there was in fact something before the Big Bang).
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