The expanding universe is a fascinating concept, but can we directly observe its changes? Our reader Buck wants to know if we can see the observable universe's expansion in real-time. While we can't directly measure the expansion of the universe by observing a single object's light over time, we can infer it through various methods. By studying distant galaxies and their redshifts, we've established that the universe is expanding. However, to truly see the effects of this expansion, we need to observe a galaxy over an incredibly long period, which is a challenging task. The key to understanding the universe's expansion lies in measuring the redshift drift, which is the change in a galaxy's redshift over time. This drift is caused by the universe's expansion, and it becomes more noticeable as we observe more distant galaxies. With the help of advanced telescopes and gravitational lensing, we might be able to directly observe the expansion of the universe in the future, providing us with a deeper understanding of its nature and evolution.
