The number of planets in our universe that could support life is difficult to estimate with precision, as there are many factors involved and our understanding of the universe is constantly evolving. Some scientists believe there may be trillions of potentially habitable planets in the Milky Way galaxy alone. However, it's important to note that while such planets may have the right physical conditions to support life, it doesn't necessarily mean that life actually exists on them. Additionally, the concept of "life" itself is complex and can vary vastly, making it challenging to determine what constitutes a habitable planet for organisms other than those found on Earth.