Final answer:
Despite there being many hypotheses in physics, two things that remain uncertain are the nature of dark energy and the possibilities of wormholes and time travel.
Step-by-step explanation:
The two things that remain uncertain despite there being many hypotheses in physics are the nature of dark energy and the possibilities of wormholes and time travel. Dark energy is a mysterious form of energy that is believed to make up the bulk of the universe, but its exact nature is still not fully understood. Wormholes and time travel are concepts that are being studied in physics but have not been proven or fully understood yet. Scientists continue to explore these ideas and test various hypotheses to gain a deeper understanding of these phenomena.