No, it is not possible to use optical telescopes like the Hubble Space Telescope to directly observe objects from before the existence of our universe. The Hubble Space Telescope primarily observes objects within our universe, such as galaxies, nebulae, and other astronomical phenomena.
The reason we cannot observe objects from before the existence of our universe is rooted in the nature of our current understanding of space and time. According to the Big Bang theory, the universe began around 13.8 billion years ago with a singularity, and our current understanding of physics breaks down at that point. Prior to the Big Bang, the concept of time as we understand it does not apply. Therefore, it is not possible to observe objects or events that predate the existence of our universe using conventional observational methods.
However, scientists study the early stages of the universe indirectly through various cosmological observations, such as studying the cosmic microwave background radiation, the distribution of galaxies, and the measurements of cosmic inflation. These methods provide insights into the early universe, but they do not allow for direct observation of objects or events before the Big Bang.