What Dark Energy Is
Where was that energy coming from when researchers first noticed that the cosmos was growing more quickly than they had anticipated? According to our knowledge, there was not enough energy available to support the expansion of the cosmos, which requires power from somewhere.
Many of the enigmas of the universe can be explained by the idea of dark energy. The expansion of the universe had to be made possible by something outside of ourselves. There also needs to be a ton of stuff out there based on our understanding of the universe's mass, but we'll get to that in a moment.
Therefore, the idea of dark energy is a reasonable method to explain why the universe expands in the manner that it does. However, the issue is that no one is sure what dark energy is or where it comes from. It provides a solution to one question but also raises other new ones that need to be addressed.