Final answer:
The statement is false; the observable universe has been expanding since the Big Bang, which occurred about 13.8 billion years ago, and continues to expand due to dark energy.
Step-by-step explanation:
The statement that the observable universe is the same size today as it was a few billion years ago is false. Astronomers have determined that the universe is expanding, which means that it regularly undergoes changes in scale; space stretches and distances between galaxies grow larger. This expansion, which started about 13.8 billion years ago, is believed to continue indefinitely, especially due to the influence of dark energy which accelerates this expansion process. Consequently, the observable universe was smaller in the past and has grown larger over time.