Until pretty recent times, there was widespread acceptance among physical scientists and even philosophers that there is a single Universe that erupted about 13.78 billion years ago, and today it contains approximately a zillion galaxies and a gazillion stars that power planets spinning around them, and at least one of those planets has life on it, and that life is entirely supported by sunlight (starlight) and all of the Universe’s parts are made up of stardust.
There is also a growing acceptance among scientists and philosophers that really, we’re fundamentally talking about waves and energy and quantum weirdness in which physical parts are, at best, ephemeral shape-shifters.
At the very small scale the Universe is hard to pin down.
Until pretty recent times, there was widespread acceptance among physical scientists and even philosophers that there is a single Universe that erupted about 13.78 billion years ago, and today it contains approximately a zillion galaxies and a gazillion stars that power planets spinning around them, and at least one of those planets has life on it, and that life is entirely supported by sunlight (starlight) and all of the Universe’s parts are made up of stardust.