It seems it will continue expanding forever.
Scientists believe so.
The big bang or a wormhole
Scientists believe the "first event" in the Universe was the Big Bang. The Big Bang Theory attempts to explain how the universe was originally created.
According to scientists the universe continues to expand as a result of the initial big bang.
Scientists refer to the event that started the universe as the Big Bang. This is a cosmological model that suggests the universe began as a very hot, dense state and has been expanding and cooling ever since.
Scientists predicted that the Big Bang should have left behind a faint glow of radiation spread throughout the universe, known as the cosmic microwave background radiation. This radiation was discovered in 1965 and is considered one of the strongest pieces of evidence in support of the Big Bang theory.
The Big Bang Theory
The Big Bang Theory
Before the Big Bang theory, many scientists believed that the universe was static, or infinitely unchanging.
The event that marks the beginning of the universe is the Big Bang. This was a cosmic event that occurred about 13.8 billion years ago, creating the universe as we know it today. The Big Bang theory is widely accepted by scientists as the most plausible explanation for the origin of the universe.
Scientists predicted that the Big Bang should have left behind radiation, specifically in the form of cosmic microwave background radiation (CMB). This radiation is a remnant from the early universe, consisting primarily of hydrogen and helium, which were the first elements formed. The CMB provides evidence for the Big Bang theory and is characterized by a uniform glow across the cosmos, with slight fluctuations that correspond to the density variations in the early universe. Redshift observations of distant galaxies further support the expansion of the universe, consistent with the Big Bang model.
Still now the most acceptable theory on the origin of universe has been the big bang theory. you can get more info on big bang theory from wikipedia.